wallet.cpp

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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-present The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#include <wallet/wallet.h>
 
#include <bitcoin-build-config.h> // IWYU pragma: keep
#include <addresstype.h>
#include <blockfilter.h>
#include <chain.h>
#include <coins.h>
#include <common/args.h>
#include <common/messages.h>
#include <common/settings.h>
#include <common/signmessage.h>
#include <common/system.h>
#include <consensus/amount.h>
#include <consensus/consensus.h>
#include <consensus/validation.h>
#include <external_signer.h>
#include <interfaces/chain.h>
#include <interfaces/handler.h>
#include <interfaces/wallet.h>
#include <kernel/mempool_removal_reason.h>
#include <kernel/types.h>
#include <key.h>
#include <key_io.h>
#include <logging.h>
#include <node/types.h>
#include <outputtype.h>
#include <policy/feerate.h>
#include <policy/truc_policy.h>
#include <primitives/block.h>
#include <primitives/transaction.h>
#include <psbt.h>
#include <pubkey.h>
#include <random.h>
#include <script/descriptor.h>
#include <script/interpreter.h>
#include <script/script.h>
#include <script/sign.h>
#include <script/signingprovider.h>
#include <script/solver.h>
#include <serialize.h>
#include <span.h>
#include <streams.h>
#include <support/allocators/secure.h>
#include <support/allocators/zeroafterfree.h>
#include <support/cleanse.h>
#include <sync.h>
#include <tinyformat.h>
#include <uint256.h>
#include <univalue.h>
#include <util/check.h>
#include <util/fs.h>
#include <util/fs_helpers.h>
#include <util/moneystr.h>
#include <util/result.h>
#include <util/string.h>
#include <util/time.h>
#include <util/translation.h>
#include <wallet/coincontrol.h>
#include <wallet/context.h>
#include <wallet/crypter.h>
#include <wallet/db.h>
#include <wallet/external_signer_scriptpubkeyman.h>
#include <wallet/scriptpubkeyman.h>
#include <wallet/transaction.h>
#include <wallet/types.h>
#include <wallet/walletdb.h>
#include <wallet/walletutil.h>
 
#include <algorithm>
#include <cassert>
#include <condition_variable>
#include <exception>
#include <optional>
#include <stdexcept>
#include <thread>
#include <tuple>
#include <variant>
 
struct KeyOriginInfo;
 
using common::AmountErrMsg;
using common::AmountHighWarn;
using common::PSBTError;
using interfaces::FoundBlock;
using kernel::ChainstateRole;
using util::ReplaceAll;
using util::ToString;
 
namespace wallet {
 
bool AddWalletSetting(interfaces::Chain& chain, const std::string& wallet_name)
{
    const auto update_function = [&wallet_name](common::SettingsValue& setting_value) {
        if (!setting_value.isArray()) setting_value.setArray();
        for (const auto& value : setting_value.getValues()) {
            if (value.isStr() && value.get_str() == wallet_name) return interfaces::SettingsAction::SKIP_WRITE;
        }
        setting_value.push_back(wallet_name);
        return interfaces::SettingsAction::WRITE;
    };
    return chain.updateRwSetting("wallet", update_function);
}
 
bool RemoveWalletSetting(interfaces::Chain& chain, const std::string& wallet_name)
{
    const auto update_function = [&wallet_name](common::SettingsValue& setting_value) {
        if (!setting_value.isArray()) return interfaces::SettingsAction::SKIP_WRITE;
        common::SettingsValue new_value(common::SettingsValue::VARR);
        for (const auto& value : setting_value.getValues()) {
            if (!value.isStr() || value.get_str() != wallet_name) new_value.push_back(value);
        }
        if (new_value.size() == setting_value.size()) return interfaces::SettingsAction::SKIP_WRITE;
        setting_value = std::move(new_value);
        return interfaces::SettingsAction::WRITE;
    };
    return chain.updateRwSetting("wallet", update_function);
}
 
static void UpdateWalletSetting(interfaces::Chain& chain,
                                const std::string& wallet_name,
                                std::optional<bool> load_on_startup,
                                std::vector<bilingual_str>& warnings)
{
    if (!load_on_startup) return;
    if (load_on_startup.value() && !AddWalletSetting(chain, wallet_name)) {
        warnings.emplace_back(Untranslated("Wallet load on startup setting could not be updated, so wallet may not be loaded next node startup."));
    } else if (!load_on_startup.value() && !RemoveWalletSetting(chain, wallet_name)) {
        warnings.emplace_back(Untranslated("Wallet load on startup setting could not be updated, so wallet may still be loaded next node startup."));
    }
}
 
static void RefreshMempoolStatus(CWalletTx& tx, interfaces::Chain& chain)
{
    if (chain.isInMempool(tx.GetHash())) {
        tx.m_state = TxStateInMempool();
    } else if (tx.state<TxStateInMempool>()) {
        tx.m_state = TxStateInactive();
    }
}
 
bool AddWallet(WalletContext& context, const std::shared_ptr<CWallet>& wallet)
{
    LOCK(context.wallets_mutex);
    assert(wallet);
    std::vector<std::shared_ptr<CWallet>>::const_iterator i = std::find(context.wallets.begin(), context.wallets.end(), wallet);
    if (i != context.wallets.end()) return false;
    context.wallets.push_back(wallet);
    wallet->ConnectScriptPubKeyManNotifiers();
    wallet->NotifyCanGetAddressesChanged();
    return true;
}
 
bool RemoveWallet(WalletContext& context, const std::shared_ptr<CWallet>& wallet, std::optional<bool> load_on_start, std::vector<bilingual_str>& warnings)
{
    assert(wallet);
 
    interfaces::Chain& chain = wallet->chain();
    std::string name = wallet->GetName();
    WITH_LOCK(wallet->cs_wallet, wallet->WriteBestBlock());
 
    // Unregister with the validation interface which also drops shared pointers.
    wallet->DisconnectChainNotifications();
    {
        LOCK(context.wallets_mutex);
        std::vector<std::shared_ptr<CWallet>>::iterator i = std::find(context.wallets.begin(), context.wallets.end(), wallet);
        if (i == context.wallets.end()) return false;
        context.wallets.erase(i);
    }
    // Notify unload so that upper layers release the shared pointer.
    wallet->NotifyUnload();
 
    // Write the wallet setting
    UpdateWalletSetting(chain, name, load_on_start, warnings);
 
    return true;
}
 
bool RemoveWallet(WalletContext& context, const std::shared_ptr<CWallet>& wallet, std::optional<bool> load_on_start)
{
    std::vector<bilingual_str> warnings;
    return RemoveWallet(context, wallet, load_on_start, warnings);
}
 
std::vector<std::shared_ptr<CWallet>> GetWallets(WalletContext& context)
{
    LOCK(context.wallets_mutex);
    return context.wallets;
}
 
std::shared_ptr<CWallet> GetDefaultWallet(WalletContext& context, size_t& count)
{
    LOCK(context.wallets_mutex);
    count = context.wallets.size();
    return count == 1 ? context.wallets[0] : nullptr;
}
 
std::shared_ptr<CWallet> GetWallet(WalletContext& context, const std::string& name)
{
    LOCK(context.wallets_mutex);
    for (const std::shared_ptr<CWallet>& wallet : context.wallets) {
        if (wallet->GetName() == name) return wallet;
    }
    return nullptr;
}
 
std::unique_ptr<interfaces::Handler> HandleLoadWallet(WalletContext& context, LoadWalletFn load_wallet)
{
    LOCK(context.wallets_mutex);
    auto it = context.wallet_load_fns.emplace(context.wallet_load_fns.end(), std::move(load_wallet));
    return interfaces::MakeCleanupHandler([&context, it] { LOCK(context.wallets_mutex); context.wallet_load_fns.erase(it); });
}
 
void NotifyWalletLoaded(WalletContext& context, const std::shared_ptr<CWallet>& wallet)
{
    LOCK(context.wallets_mutex);
    for (auto& load_wallet : context.wallet_load_fns) {
        load_wallet(interfaces::MakeWallet(context, wallet));
    }
}
 
static GlobalMutex g_loading_wallet_mutex;
static GlobalMutex g_wallet_release_mutex;
static std::condition_variable g_wallet_release_cv;
static std::set<std::string> g_loading_wallet_set GUARDED_BY(g_loading_wallet_mutex);
static std::set<std::string> g_unloading_wallet_set GUARDED_BY(g_wallet_release_mutex);
 
// Custom deleter for shared_ptr<CWallet>.
static void FlushAndDeleteWallet(CWallet* wallet)
{
    const std::string name = wallet->GetName();
    wallet->WalletLogPrintf("Releasing wallet %s..\n", name);
    delete wallet;
    // Wallet is now released, notify WaitForDeleteWallet, if any.
    {
        LOCK(g_wallet_release_mutex);
        if (g_unloading_wallet_set.erase(name) == 0) {
            // WaitForDeleteWallet was not called for this wallet, all done.
            return;
        }
    }
    g_wallet_release_cv.notify_all();
}
 
void WaitForDeleteWallet(std::shared_ptr<CWallet>&& wallet)
{
    // Mark wallet for unloading.
    const std::string name = wallet->GetName();
    {
        LOCK(g_wallet_release_mutex);
        g_unloading_wallet_set.insert(name);
        // Do not expect to be the only one removing this wallet.
        // Multiple threads could simultaneously be waiting for deletion.
    }
 
    // Time to ditch our shared_ptr and wait for FlushAndDeleteWallet call.
    wallet.reset();
    {
        WAIT_LOCK(g_wallet_release_mutex, lock);
        while (g_unloading_wallet_set.contains(name)) {
            g_wallet_release_cv.wait(lock);
        }
    }
}
 
namespace {
std::shared_ptr<CWallet> LoadWalletInternal(WalletContext& context, const std::string& name, std::optional<bool> load_on_start, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error, std::vector<bilingual_str>& warnings)
{
    try {
        std::unique_ptr<WalletDatabase> database = MakeWalletDatabase(name, options, status, error);
        if (!database) {
            error = Untranslated("Wallet file verification failed.") + Untranslated(" ") + error;
            return nullptr;
        }
 
        context.chain->initMessage(_("Loading wallet…"));
        std::shared_ptr<CWallet> wallet = CWallet::LoadExisting(context, name, std::move(database), error, warnings);
        if (!wallet) {
            error = Untranslated("Wallet loading failed.") + Untranslated(" ") + error;
            status = DatabaseStatus::FAILED_LOAD;
            return nullptr;
        }
 
        NotifyWalletLoaded(context, wallet);
        AddWallet(context, wallet);
        wallet->postInitProcess();
 
        // Write the wallet setting
        UpdateWalletSetting(*context.chain, name, load_on_start, warnings);
 
        return wallet;
    } catch (const std::runtime_error& e) {
        error = Untranslated(e.what());
        status = DatabaseStatus::FAILED_LOAD;
        return nullptr;
    }
}
 
class FastWalletRescanFilter
{
public:
    FastWalletRescanFilter(const CWallet& wallet) : m_wallet(wallet)
    {
        // create initial filter with scripts from all ScriptPubKeyMans
        for (auto spkm : m_wallet.GetAllScriptPubKeyMans()) {
            auto desc_spkm{dynamic_cast<DescriptorScriptPubKeyMan*>(spkm)};
            assert(desc_spkm != nullptr);
            AddScriptPubKeys(desc_spkm);
            // save each range descriptor's end for possible future filter updates
            if (desc_spkm->IsHDEnabled()) {
                m_last_range_ends.emplace(desc_spkm->GetID(), desc_spkm->GetEndRange());
            }
        }
    }
 
    void UpdateIfNeeded()
    {
        // repopulate filter with new scripts if top-up has happened since last iteration
        for (const auto& [desc_spkm_id, last_range_end] : m_last_range_ends) {
            auto desc_spkm{dynamic_cast<DescriptorScriptPubKeyMan*>(m_wallet.GetScriptPubKeyMan(desc_spkm_id))};
            assert(desc_spkm != nullptr);
            int32_t current_range_end{desc_spkm->GetEndRange()};
            if (current_range_end > last_range_end) {
                AddScriptPubKeys(desc_spkm, last_range_end);
                m_last_range_ends.at(desc_spkm->GetID()) = current_range_end;
            }
        }
    }
 
    std::optional<bool> MatchesBlock(const uint256& block_hash) const
    {
        return m_wallet.chain().blockFilterMatchesAny(BlockFilterType::BASIC, block_hash, m_filter_set);
    }
 
private:
    const CWallet& m_wallet;
    std::map<uint256, int32_t> m_last_range_ends;
    GCSFilter::ElementSet m_filter_set;
 
    void AddScriptPubKeys(const DescriptorScriptPubKeyMan* desc_spkm, int32_t last_range_end = 0)
    {
        for (const auto& script_pub_key : desc_spkm->GetScriptPubKeys(last_range_end)) {
            m_filter_set.emplace(script_pub_key.begin(), script_pub_key.end());
        }
    }
};
} // namespace
 
std::shared_ptr<CWallet> LoadWallet(WalletContext& context, const std::string& name, std::optional<bool> load_on_start, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error, std::vector<bilingual_str>& warnings)
{
    auto result = WITH_LOCK(g_loading_wallet_mutex, return g_loading_wallet_set.insert(name));
    if (!result.second) {
        error = Untranslated("Wallet already loading.");
        status = DatabaseStatus::FAILED_LOAD;
        return nullptr;
    }
    auto wallet = LoadWalletInternal(context, name, load_on_start, options, status, error, warnings);
    WITH_LOCK(g_loading_wallet_mutex, g_loading_wallet_set.erase(result.first));
    return wallet;
}
 
std::shared_ptr<CWallet> CreateWallet(WalletContext& context, const std::string& name, std::optional<bool> load_on_start, DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error, std::vector<bilingual_str>& warnings)
{
    // Wallet must have a non-empty name
    if (name.empty()) {
        error = Untranslated("Wallet name cannot be empty");
        status = DatabaseStatus::FAILED_NEW_UNNAMED;
        return nullptr;
    }
 
    uint64_t wallet_creation_flags = options.create_flags;
    const SecureString& passphrase = options.create_passphrase;
 
    // Only descriptor wallets can be created
    Assert(wallet_creation_flags & WALLET_FLAG_DESCRIPTORS);
    options.require_format = DatabaseFormat::SQLITE;
 
    // Indicate that the wallet is actually supposed to be blank and not just blank to make it encrypted
    bool create_blank = (wallet_creation_flags & WALLET_FLAG_BLANK_WALLET);
 
    // Born encrypted wallets need to be created blank first.
    if (!passphrase.empty()) {
        wallet_creation_flags |= WALLET_FLAG_BLANK_WALLET;
    }
 
    // Private keys must be disabled for an external signer wallet
    if ((wallet_creation_flags & WALLET_FLAG_EXTERNAL_SIGNER) && !(wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
        error = Untranslated("Private keys must be disabled when using an external signer");
        status = DatabaseStatus::FAILED_CREATE;
        return nullptr;
    }
 
    // Do not allow a passphrase when private keys are disabled
    if (!passphrase.empty() && (wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
        error = Untranslated("Passphrase provided but private keys are disabled. A passphrase is only used to encrypt private keys, so cannot be used for wallets with private keys disabled.");
        status = DatabaseStatus::FAILED_CREATE;
        return nullptr;
    }
 
    // Wallet::Verify will check if we're trying to create a wallet with a duplicate name.
    std::unique_ptr<WalletDatabase> database = MakeWalletDatabase(name, options, status, error);
    if (!database) {
        error = Untranslated("Wallet file verification failed.") + Untranslated(" ") + error;
        status = DatabaseStatus::FAILED_VERIFY;
        return nullptr;
    }
 
    // Make the wallet
    context.chain->initMessage(_("Creating wallet…"));
    std::shared_ptr<CWallet> wallet = CWallet::CreateNew(context, name, std::move(database), wallet_creation_flags, error, warnings);
    if (!wallet) {
        error = Untranslated("Wallet creation failed.") + Untranslated(" ") + error;
        status = DatabaseStatus::FAILED_CREATE;
        return nullptr;
    }
 
    // Encrypt the wallet
    if (!passphrase.empty() && !(wallet_creation_flags & WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
        if (!wallet->EncryptWallet(passphrase)) {
            error = Untranslated("Error: Wallet created but failed to encrypt.");
            status = DatabaseStatus::FAILED_ENCRYPT;
            return nullptr;
        }
        if (!create_blank) {
            // Unlock the wallet
            if (!wallet->Unlock(passphrase)) {
                error = Untranslated("Error: Wallet was encrypted but could not be unlocked");
                status = DatabaseStatus::FAILED_ENCRYPT;
                return nullptr;
            }
 
            // Set a seed for the wallet
            {
                LOCK(wallet->cs_wallet);
                wallet->SetupDescriptorScriptPubKeyMans();
            }
 
            // Relock the wallet
            wallet->Lock();
        }
    }
 
    WITH_LOCK(wallet->cs_wallet, wallet->LogStats());
    NotifyWalletLoaded(context, wallet);
    AddWallet(context, wallet);
    wallet->postInitProcess();
 
    // Write the wallet settings
    UpdateWalletSetting(*context.chain, name, load_on_start, warnings);
 
    status = DatabaseStatus::SUCCESS;
    return wallet;
}
 
// Re-creates wallet from the backup file by renaming and moving it into the wallet's directory.
// If 'load_after_restore=true', the wallet object will be fully initialized and appended to the context.
std::shared_ptr<CWallet> RestoreWallet(WalletContext& context, const fs::path& backup_file, const std::string& wallet_name, std::optional<bool> load_on_start, DatabaseStatus& status, bilingual_str& error, std::vector<bilingual_str>& warnings, bool load_after_restore, bool allow_unnamed)
{
    // Error if the wallet name is empty and allow_unnamed == false
    // allow_unnamed == true is only used by migration to migrate an unnamed wallet
    if (!allow_unnamed && wallet_name.empty()) {
        error = Untranslated("Wallet name cannot be empty");
        status = DatabaseStatus::FAILED_NEW_UNNAMED;
        return nullptr;
    }
 
    DatabaseOptions options;
    ReadDatabaseArgs(*context.args, options);
    options.require_existing = true;
 
    const fs::path wallet_path = fsbridge::AbsPathJoin(GetWalletDir(), fs::u8path(wallet_name));
    auto wallet_file = wallet_path / "wallet.dat";
    std::shared_ptr<CWallet> wallet;
    bool wallet_file_copied = false;
    bool created_parent_dir = false;
 
    try {
        if (!fs::exists(backup_file)) {
            error = Untranslated("Backup file does not exist");
            status = DatabaseStatus::FAILED_INVALID_BACKUP_FILE;
            return nullptr;
        }
 
        // Wallet directories are allowed to exist, but must not contain a .dat file.
        // Any existing wallet database is treated as a hard failure to prevent overwriting.
        if (fs::exists(wallet_path)) {
            // If this is a file, it is the db and we don't want to overwrite it.
            if (!fs::is_directory(wallet_path)) {
                error = Untranslated(strprintf("Failed to restore wallet. Database file exists '%s'.", fs::PathToString(wallet_path)));
                status = DatabaseStatus::FAILED_ALREADY_EXISTS;
                return nullptr;
            }
 
            // Check we are not going to overwrite an existing db file
            if (fs::exists(wallet_file)) {
                error = Untranslated(strprintf("Failed to restore wallet. Database file exists in '%s'.", fs::PathToString(wallet_file)));
                status = DatabaseStatus::FAILED_ALREADY_EXISTS;
                return nullptr;
            }
        } else {
            // The directory doesn't exist, create it
            if (!TryCreateDirectories(wallet_path)) {
                error = Untranslated(strprintf("Failed to restore database path '%s'.", fs::PathToString(wallet_path)));
                status = DatabaseStatus::FAILED_ALREADY_EXISTS;
                return nullptr;
            }
            created_parent_dir = true;
        }
 
        fs::copy_file(backup_file, wallet_file, fs::copy_options::none);
        wallet_file_copied = true;
 
        if (load_after_restore) {
            wallet = LoadWallet(context, wallet_name, load_on_start, options, status, error, warnings);
        }
    } catch (const std::exception& e) {
        assert(!wallet);
        if (!error.empty()) error += Untranslated("\n");
        error += Untranslated(strprintf("Unexpected exception: %s", e.what()));
    }
 
    // Remove created wallet path only when loading fails
    if (load_after_restore && !wallet) {
        if (wallet_file_copied) fs::remove(wallet_file);
        // Clean up the parent directory if we created it during restoration.
        // As we have created it, it must be empty after deleting the wallet file.
        if (created_parent_dir) {
            Assume(fs::is_empty(wallet_path));
            fs::remove(wallet_path);
        }
    }
 
    return wallet;
}
 
const CWalletTx* CWallet::GetWalletTx(const Txid& hash) const
{
    AssertLockHeld(cs_wallet);
    const auto it = mapWallet.find(hash);
    if (it == mapWallet.end())
        return nullptr;
    return &(it->second);
}
 
void CWallet::UpgradeDescriptorCache()
{
    if (!IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS) || IsLocked() || IsWalletFlagSet(WALLET_FLAG_LAST_HARDENED_XPUB_CACHED)) {
        return;
    }
 
    for (ScriptPubKeyMan* spkm : GetAllScriptPubKeyMans()) {
        DescriptorScriptPubKeyMan* desc_spkm = dynamic_cast<DescriptorScriptPubKeyMan*>(spkm);
        desc_spkm->UpgradeDescriptorCache();
    }
    SetWalletFlag(WALLET_FLAG_LAST_HARDENED_XPUB_CACHED);
}
 
/* Given a wallet passphrase string and an unencrypted master key, determine the proper key
 * derivation parameters (should take at least 100ms) and encrypt the master key. */
static bool EncryptMasterKey(const SecureString& wallet_passphrase, const CKeyingMaterial& plain_master_key, CMasterKey& master_key)
{
    constexpr MillisecondsDouble target{100};
    auto start{SteadyClock::now()};
    CCrypter crypter;
 
    crypter.SetKeyFromPassphrase(wallet_passphrase, master_key.vchSalt, master_key.nDeriveIterations, master_key.nDerivationMethod);
    master_key.nDeriveIterations = static_cast<unsigned int>(master_key.nDeriveIterations * target / (SteadyClock::now() - start));
 
    start = SteadyClock::now();
    crypter.SetKeyFromPassphrase(wallet_passphrase, master_key.vchSalt, master_key.nDeriveIterations, master_key.nDerivationMethod);
    master_key.nDeriveIterations = (master_key.nDeriveIterations + static_cast<unsigned int>(master_key.nDeriveIterations * target / (SteadyClock::now() - start))) / 2;
 
    if (master_key.nDeriveIterations < CMasterKey::DEFAULT_DERIVE_ITERATIONS) {
        master_key.nDeriveIterations = CMasterKey::DEFAULT_DERIVE_ITERATIONS;
    }
 
    if (!crypter.SetKeyFromPassphrase(wallet_passphrase, master_key.vchSalt, master_key.nDeriveIterations, master_key.nDerivationMethod)) {
        return false;
    }
    if (!crypter.Encrypt(plain_master_key, master_key.vchCryptedKey)) {
        return false;
    }
 
    return true;
}
 
static bool DecryptMasterKey(const SecureString& wallet_passphrase, const CMasterKey& master_key, CKeyingMaterial& plain_master_key)
{
    CCrypter crypter;
    if (!crypter.SetKeyFromPassphrase(wallet_passphrase, master_key.vchSalt, master_key.nDeriveIterations, master_key.nDerivationMethod)) {
        return false;
    }
    if (!crypter.Decrypt(master_key.vchCryptedKey, plain_master_key)) {
        return false;
    }
 
    return true;
}
 
bool CWallet::Unlock(const SecureString& strWalletPassphrase)
{
    CKeyingMaterial plain_master_key;
 
    {
        LOCK(cs_wallet);
        for (const auto& [_, master_key] : mapMasterKeys)
        {
            if (!DecryptMasterKey(strWalletPassphrase, master_key, plain_master_key)) {
                continue; // try another master key
            }
            if (Unlock(plain_master_key)) {
                // Now that we've unlocked, upgrade the descriptor cache
                UpgradeDescriptorCache();
                return true;
            }
        }
    }
    return false;
}
 
bool CWallet::ChangeWalletPassphrase(const SecureString& strOldWalletPassphrase, const SecureString& strNewWalletPassphrase)
{
    bool fWasLocked = IsLocked();
 
    {
        LOCK2(m_relock_mutex, cs_wallet);
        Lock();
 
        CKeyingMaterial plain_master_key;
        for (auto& [master_key_id, master_key] : mapMasterKeys)
        {
            if (!DecryptMasterKey(strOldWalletPassphrase, master_key, plain_master_key)) {
                return false;
            }
            if (Unlock(plain_master_key))
            {
                if (!EncryptMasterKey(strNewWalletPassphrase, plain_master_key, master_key)) {
                    return false;
                }
                WalletLogPrintf("Wallet passphrase changed to an nDeriveIterations of %i\n", master_key.nDeriveIterations);
 
                WalletBatch(GetDatabase()).WriteMasterKey(master_key_id, master_key);
                if (fWasLocked)
                    Lock();
                return true;
            }
        }
    }
 
    return false;
}
 
void CWallet::SetLastBlockProcessedInMem(int block_height, uint256 block_hash)
{
    AssertLockHeld(cs_wallet);
 
    m_last_block_processed = block_hash;
    m_last_block_processed_height = block_height;
}
 
void CWallet::SetLastBlockProcessed(int block_height, uint256 block_hash)
{
    AssertLockHeld(cs_wallet);
 
    SetLastBlockProcessedInMem(block_height, block_hash);
    WriteBestBlock();
}
 
std::set<Txid> CWallet::GetConflicts(const Txid& txid) const
{
    std::set<Txid> result;
    AssertLockHeld(cs_wallet);
 
    const auto it = mapWallet.find(txid);
    if (it == mapWallet.end())
        return result;
    const CWalletTx& wtx = it->second;
 
    std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range;
 
    for (const CTxIn& txin : wtx.tx->vin)
    {
        if (mapTxSpends.count(txin.prevout) <= 1)
            continue;  // No conflict if zero or one spends
        range = mapTxSpends.equal_range(txin.prevout);
        for (TxSpends::const_iterator _it = range.first; _it != range.second; ++_it)
            result.insert(_it->second);
    }
    return result;
}
 
bool CWallet::HasWalletSpend(const CTransactionRef& tx) const
{
    AssertLockHeld(cs_wallet);
    const Txid& txid = tx->GetHash();
    for (unsigned int i = 0; i < tx->vout.size(); ++i) {
        if (IsSpent(COutPoint(txid, i))) {
            return true;
        }
    }
    return false;
}
 
void CWallet::Close()
{
    GetDatabase().Close();
}
 
void CWallet::SyncMetaData(std::pair<TxSpends::iterator, TxSpends::iterator> range)
{
    // We want all the wallet transactions in range to have the same metadata as
    // the oldest (smallest nOrderPos).
    // So: find smallest nOrderPos:
 
    int nMinOrderPos = std::numeric_limits<int>::max();
    const CWalletTx* copyFrom = nullptr;
    for (TxSpends::iterator it = range.first; it != range.second; ++it) {
        const CWalletTx* wtx = &mapWallet.at(it->second);
        if (wtx->nOrderPos < nMinOrderPos) {
            nMinOrderPos = wtx->nOrderPos;
            copyFrom = wtx;
        }
    }
 
    if (!copyFrom) {
        return;
    }
 
    // Now copy data from copyFrom to rest:
    for (TxSpends::iterator it = range.first; it != range.second; ++it)
    {
        const Txid& hash = it->second;
        CWalletTx* copyTo = &mapWallet.at(hash);
        if (copyFrom == copyTo) continue;
        assert(copyFrom && "Oldest wallet transaction in range assumed to have been found.");
        if (!copyFrom->IsEquivalentTo(*copyTo)) continue;
        copyTo->mapValue = copyFrom->mapValue;
        copyTo->vOrderForm = copyFrom->vOrderForm;
        // nTimeReceived not copied on purpose
        copyTo->nTimeSmart = copyFrom->nTimeSmart;
        // nOrderPos not copied on purpose
        // cached members not copied on purpose
    }
}
 
bool CWallet::IsSpent(const COutPoint& outpoint) const
{
    std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range;
    range = mapTxSpends.equal_range(outpoint);
 
    for (TxSpends::const_iterator it = range.first; it != range.second; ++it) {
        const Txid& txid = it->second;
        const auto mit = mapWallet.find(txid);
        if (mit != mapWallet.end()) {
            const auto& wtx = mit->second;
            if (!wtx.isAbandoned() && !wtx.isBlockConflicted() && !wtx.isMempoolConflicted())
                return true; // Spent
        }
    }
    return false;
}
 
void CWallet::AddToSpends(const COutPoint& outpoint, const Txid& txid)
{
    mapTxSpends.insert(std::make_pair(outpoint, txid));
 
    UnlockCoin(outpoint);
 
    std::pair<TxSpends::iterator, TxSpends::iterator> range;
    range = mapTxSpends.equal_range(outpoint);
    SyncMetaData(range);
}
 
 
void CWallet::AddToSpends(const CWalletTx& wtx)
{
    if (wtx.IsCoinBase()) // Coinbases don't spend anything!
        return;
 
    for (const CTxIn& txin : wtx.tx->vin)
        AddToSpends(txin.prevout, wtx.GetHash());
}
 
bool CWallet::EncryptWallet(const SecureString& strWalletPassphrase)
{
    // Only descriptor wallets can be encrypted
    Assert(IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
 
    if (HasEncryptionKeys())
        return false;
 
    CKeyingMaterial plain_master_key;
 
    plain_master_key.resize(WALLET_CRYPTO_KEY_SIZE);
    GetStrongRandBytes(plain_master_key);
 
    CMasterKey master_key;
 
    master_key.vchSalt.resize(WALLET_CRYPTO_SALT_SIZE);
    GetStrongRandBytes(master_key.vchSalt);
 
    if (!EncryptMasterKey(strWalletPassphrase, plain_master_key, master_key)) {
        return false;
    }
    WalletLogPrintf("Encrypting Wallet with an nDeriveIterations of %i\n", master_key.nDeriveIterations);
 
    {
        LOCK2(m_relock_mutex, cs_wallet);
        mapMasterKeys[++nMasterKeyMaxID] = master_key;
        WalletBatch* encrypted_batch = new WalletBatch(GetDatabase());
        if (!encrypted_batch->TxnBegin()) {
            delete encrypted_batch;
            encrypted_batch = nullptr;
            return false;
        }
        encrypted_batch->WriteMasterKey(nMasterKeyMaxID, master_key);
 
        for (const auto& spk_man_pair : m_spk_managers) {
            auto spk_man = spk_man_pair.second.get();
            if (!spk_man->Encrypt(plain_master_key, encrypted_batch)) {
                encrypted_batch->TxnAbort();
                delete encrypted_batch;
                encrypted_batch = nullptr;
                // We now probably have half of our keys encrypted in memory, and half not...
                // die and let the user reload the unencrypted wallet.
                assert(false);
            }
        }
 
        if (!encrypted_batch->TxnCommit()) {
            delete encrypted_batch;
            encrypted_batch = nullptr;
            // We now have keys encrypted in memory, but not on disk...
            // die to avoid confusion and let the user reload the unencrypted wallet.
            assert(false);
        }
 
        delete encrypted_batch;
        encrypted_batch = nullptr;
 
        Lock();
        Unlock(strWalletPassphrase);
 
        // Make new descriptors with a new seed
        if (!IsWalletFlagSet(WALLET_FLAG_BLANK_WALLET)) {
            SetupDescriptorScriptPubKeyMans();
        }
        Lock();
 
        // Need to completely rewrite the wallet file; if we don't, the database might keep
        // bits of the unencrypted private key in slack space in the database file.
        GetDatabase().Rewrite();
    }
    NotifyStatusChanged(this);
 
    return true;
}
 
DBErrors CWallet::ReorderTransactions()
{
    LOCK(cs_wallet);
    WalletBatch batch(GetDatabase());
 
    // Old wallets didn't have any defined order for transactions
    // Probably a bad idea to change the output of this
 
    // First: get all CWalletTx into a sorted-by-time multimap.
    typedef std::multimap<int64_t, CWalletTx*> TxItems;
    TxItems txByTime;
 
    for (auto& entry : mapWallet)
    {
        CWalletTx* wtx = &entry.second;
        txByTime.insert(std::make_pair(wtx->nTimeReceived, wtx));
    }
 
    nOrderPosNext = 0;
    std::vector<int64_t> nOrderPosOffsets;
    for (TxItems::iterator it = txByTime.begin(); it != txByTime.end(); ++it)
    {
        CWalletTx *const pwtx = (*it).second;
        int64_t& nOrderPos = pwtx->nOrderPos;
 
        if (nOrderPos == -1)
        {
            nOrderPos = nOrderPosNext++;
            nOrderPosOffsets.push_back(nOrderPos);
 
            if (!batch.WriteTx(*pwtx))
                return DBErrors::LOAD_FAIL;
        }
        else
        {
            int64_t nOrderPosOff = 0;
            for (const int64_t& nOffsetStart : nOrderPosOffsets)
            {
                if (nOrderPos >= nOffsetStart)
                    ++nOrderPosOff;
            }
            nOrderPos += nOrderPosOff;
            nOrderPosNext = std::max(nOrderPosNext, nOrderPos + 1);
 
            if (!nOrderPosOff)
                continue;
 
            // Since we're changing the order, write it back
            if (!batch.WriteTx(*pwtx))
                return DBErrors::LOAD_FAIL;
        }
    }
    batch.WriteOrderPosNext(nOrderPosNext);
 
    return DBErrors::LOAD_OK;
}
 
int64_t CWallet::IncOrderPosNext(WalletBatch* batch)
{
    AssertLockHeld(cs_wallet);
    int64_t nRet = nOrderPosNext++;
    if (batch) {
        batch->WriteOrderPosNext(nOrderPosNext);
    } else {
        WalletBatch(GetDatabase()).WriteOrderPosNext(nOrderPosNext);
    }
    return nRet;
}
 
void CWallet::MarkDirty()
{
    {
        LOCK(cs_wallet);
        for (auto& [_, wtx] : mapWallet)
            wtx.MarkDirty();
    }
}
 
bool CWallet::MarkReplaced(const Txid& originalHash, const Txid& newHash)
{
    LOCK(cs_wallet);
 
    auto mi = mapWallet.find(originalHash);
 
    // There is a bug if MarkReplaced is not called on an existing wallet transaction.
    assert(mi != mapWallet.end());
 
    CWalletTx& wtx = (*mi).second;
 
    // Ensure for now that we're not overwriting data
    assert(!wtx.mapValue.contains("replaced_by_txid"));
 
    wtx.mapValue["replaced_by_txid"] = newHash.ToString();
 
    // Refresh mempool status without waiting for transactionRemovedFromMempool or transactionAddedToMempool
    RefreshMempoolStatus(wtx, chain());
 
    WalletBatch batch(GetDatabase());
 
    bool success = true;
    if (!batch.WriteTx(wtx)) {
        WalletLogPrintf("%s: Updating batch tx %s failed\n", __func__, wtx.GetHash().ToString());
        success = false;
    }
 
    NotifyTransactionChanged(originalHash, CT_UPDATED);
 
    return success;
}
 
void CWallet::SetSpentKeyState(WalletBatch& batch, const Txid& hash, unsigned int n, bool used, std::set<CTxDestination>& tx_destinations)
{
    AssertLockHeld(cs_wallet);
    const CWalletTx* srctx = GetWalletTx(hash);
    if (!srctx) return;
 
    CTxDestination dst;
    if (ExtractDestination(srctx->tx->vout[n].scriptPubKey, dst)) {
        if (IsMine(dst)) {
            if (used != IsAddressPreviouslySpent(dst)) {
                if (used) {
                    tx_destinations.insert(dst);
                }
                SetAddressPreviouslySpent(batch, dst, used);
            }
        }
    }
}
 
bool CWallet::IsSpentKey(const CScript& scriptPubKey) const
{
    AssertLockHeld(cs_wallet);
    CTxDestination dest;
    if (!ExtractDestination(scriptPubKey, dest)) {
        return false;
    }
    if (IsAddressPreviouslySpent(dest)) {
        return true;
    }
    return false;
}
 
CWalletTx* CWallet::AddToWallet(CTransactionRef tx, const TxState& state, const UpdateWalletTxFn& update_wtx, bool rescanning_old_block)
{
    LOCK(cs_wallet);
 
    WalletBatch batch(GetDatabase());
 
    Txid hash = tx->GetHash();
 
    if (IsWalletFlagSet(WALLET_FLAG_AVOID_REUSE)) {
        // Mark used destinations
        std::set<CTxDestination> tx_destinations;
 
        for (const CTxIn& txin : tx->vin) {
            const COutPoint& op = txin.prevout;
            SetSpentKeyState(batch, op.hash, op.n, true, tx_destinations);
        }
 
        MarkDestinationsDirty(tx_destinations);
    }
 
    // Inserts only if not already there, returns tx inserted or tx found
    auto ret = mapWallet.emplace(std::piecewise_construct, std::forward_as_tuple(hash), std::forward_as_tuple(tx, state));
    CWalletTx& wtx = (*ret.first).second;
    bool fInsertedNew = ret.second;
    bool fUpdated = update_wtx && update_wtx(wtx, fInsertedNew);
    if (fInsertedNew) {
        wtx.nTimeReceived = GetTime();
        wtx.nOrderPos = IncOrderPosNext(&batch);
        wtx.m_it_wtxOrdered = wtxOrdered.insert(std::make_pair(wtx.nOrderPos, &wtx));
        wtx.nTimeSmart = ComputeTimeSmart(wtx, rescanning_old_block);
        AddToSpends(wtx);
 
        // Update birth time when tx time is older than it.
        MaybeUpdateBirthTime(wtx.GetTxTime());
    }
 
    if (!fInsertedNew)
    {
        if (state.index() != wtx.m_state.index()) {
            wtx.m_state = state;
            fUpdated = true;
        } else {
            assert(TxStateSerializedIndex(wtx.m_state) == TxStateSerializedIndex(state));
            assert(TxStateSerializedBlockHash(wtx.m_state) == TxStateSerializedBlockHash(state));
        }
        // If we have a witness-stripped version of this transaction, and we
        // see a new version with a witness, then we must be upgrading a pre-segwit
        // wallet.  Store the new version of the transaction with the witness,
        // as the stripped-version must be invalid.
        // TODO: Store all versions of the transaction, instead of just one.
        if (tx->HasWitness() && !wtx.tx->HasWitness()) {
            wtx.SetTx(tx);
            fUpdated = true;
        }
    }
 
    // Mark inactive coinbase transactions and their descendants as abandoned
    if (wtx.IsCoinBase() && wtx.isInactive()) {
        std::vector<CWalletTx*> txs{&wtx};
 
        TxStateInactive inactive_state = TxStateInactive{/*abandoned=*/true};
 
        while (!txs.empty()) {
            CWalletTx* desc_tx = txs.back();
            txs.pop_back();
            desc_tx->m_state = inactive_state;
            // Break caches since we have changed the state
            desc_tx->MarkDirty();
            batch.WriteTx(*desc_tx);
            MarkInputsDirty(desc_tx->tx);
            for (unsigned int i = 0; i < desc_tx->tx->vout.size(); ++i) {
                COutPoint outpoint(desc_tx->GetHash(), i);
                std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range = mapTxSpends.equal_range(outpoint);
                for (TxSpends::const_iterator it = range.first; it != range.second; ++it) {
                    const auto wit = mapWallet.find(it->second);
                    if (wit != mapWallet.end()) {
                        txs.push_back(&wit->second);
                    }
                }
            }
        }
    }
 
    std::string status{"no-change"};
    if (fInsertedNew || fUpdated) {
        status = fInsertedNew ? (fUpdated ? "new, update" : "new") : "update";
    }
    WalletLogPrintf("AddToWallet %s %s %s", hash.ToString(), status, TxStateString(state));
 
    // Write to disk
    if (fInsertedNew || fUpdated)
        if (!batch.WriteTx(wtx))
            return nullptr;
 
    // Break debit/credit balance caches:
    wtx.MarkDirty();
 
    // Cache the outputs that belong to the wallet
    RefreshTXOsFromTx(wtx);
 
    // Notify UI of new or updated transaction
    NotifyTransactionChanged(hash, fInsertedNew ? CT_NEW : CT_UPDATED);
 
#if HAVE_SYSTEM
    // notify an external script when a wallet transaction comes in or is updated
    std::string strCmd = m_notify_tx_changed_script;
 
    if (!strCmd.empty())
    {
        ReplaceAll(strCmd, "%s", hash.GetHex());
        if (auto* conf = wtx.state<TxStateConfirmed>())
        {
            ReplaceAll(strCmd, "%b", conf->confirmed_block_hash.GetHex());
            ReplaceAll(strCmd, "%h", ToString(conf->confirmed_block_height));
        } else {
            ReplaceAll(strCmd, "%b", "unconfirmed");
            ReplaceAll(strCmd, "%h", "-1");
        }
#ifndef WIN32
        // Substituting the wallet name isn't currently supported on windows
        // because windows shell escaping has not been implemented yet:
        // https://github.com/bitcoin/bitcoin/pull/13339#issuecomment-537384875
        // A few ways it could be implemented in the future are described in:
        // https://github.com/bitcoin/bitcoin/pull/13339#issuecomment-461288094
        ReplaceAll(strCmd, "%w", ShellEscape(GetName()));
#endif
        std::thread t(runCommand, strCmd);
        t.detach(); // thread runs free
    }
#endif
 
    return &wtx;
}
 
bool CWallet::LoadToWallet(const Txid& hash, const UpdateWalletTxFn& fill_wtx)
{
    const auto& ins = mapWallet.emplace(std::piecewise_construct, std::forward_as_tuple(hash), std::forward_as_tuple(nullptr, TxStateInactive{}));
    CWalletTx& wtx = ins.first->second;
    if (!fill_wtx(wtx, ins.second)) {
        return false;
    }
    // If wallet doesn't have a chain (e.g when using bitcoin-wallet tool),
    // don't bother to update txn.
    if (HaveChain()) {
      wtx.updateState(chain());
    }
    if (/* insertion took place */ ins.second) {
        wtx.m_it_wtxOrdered = wtxOrdered.insert(std::make_pair(wtx.nOrderPos, &wtx));
    }
    AddToSpends(wtx);
    for (const CTxIn& txin : wtx.tx->vin) {
        auto it = mapWallet.find(txin.prevout.hash);
        if (it != mapWallet.end()) {
            CWalletTx& prevtx = it->second;
            if (auto* prev = prevtx.state<TxStateBlockConflicted>()) {
                MarkConflicted(prev->conflicting_block_hash, prev->conflicting_block_height, wtx.GetHash());
            }
        }
    }
 
    // Update birth time when tx time is older than it.
    MaybeUpdateBirthTime(wtx.GetTxTime());
 
    // Make sure the tx outputs are known by the wallet
    RefreshTXOsFromTx(wtx);
    return true;
}
 
bool CWallet::AddToWalletIfInvolvingMe(const CTransactionRef& ptx, const SyncTxState& state, bool fUpdate, bool rescanning_old_block)
{
    const CTransaction& tx = *ptx;
    {
        AssertLockHeld(cs_wallet);
 
        if (auto* conf = std::get_if<TxStateConfirmed>(&state)) {
            for (const CTxIn& txin : tx.vin) {
                std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range = mapTxSpends.equal_range(txin.prevout);
                while (range.first != range.second) {
                    if (range.first->second != tx.GetHash()) {
                        WalletLogPrintf("Transaction %s (in block %s) conflicts with wallet transaction %s (both spend %s:%i)\n", tx.GetHash().ToString(), conf->confirmed_block_hash.ToString(), range.first->second.ToString(), range.first->first.hash.ToString(), range.first->first.n);
                        MarkConflicted(conf->confirmed_block_hash, conf->confirmed_block_height, range.first->second);
                    }
                    range.first++;
                }
            }
        }
 
        bool fExisted = mapWallet.contains(tx.GetHash());
        if (fExisted && !fUpdate) return false;
        if (fExisted || IsMine(tx) || IsFromMe(tx))
        {
            /* Check if any keys in the wallet keypool that were supposed to be unused
             * have appeared in a new transaction. If so, remove those keys from the keypool.
             * This can happen when restoring an old wallet backup that does not contain
             * the mostly recently created transactions from newer versions of the wallet.
             */
 
            // loop though all outputs
            for (const CTxOut& txout: tx.vout) {
                for (const auto& spk_man : GetScriptPubKeyMans(txout.scriptPubKey)) {
                    for (auto &dest : spk_man->MarkUnusedAddresses(txout.scriptPubKey)) {
                        // If internal flag is not defined try to infer it from the ScriptPubKeyMan
                        if (!dest.internal.has_value()) {
                            dest.internal = IsInternalScriptPubKeyMan(spk_man);
                        }
 
                        // skip if can't determine whether it's a receiving address or not
                        if (!dest.internal.has_value()) continue;
 
                        // If this is a receiving address and it's not in the address book yet
                        // (e.g. it wasn't generated on this node or we're restoring from backup)
                        // add it to the address book for proper transaction accounting
                        if (!*dest.internal && !FindAddressBookEntry(dest.dest, /* allow_change= */ false)) {
                            SetAddressBook(dest.dest, "", AddressPurpose::RECEIVE);
                        }
                    }
                }
            }
 
            // Block disconnection override an abandoned tx as unconfirmed
            // which means user may have to call abandontransaction again
            TxState tx_state = std::visit([](auto&& s) -> TxState { return s; }, state);
            CWalletTx* wtx = AddToWallet(MakeTransactionRef(tx), tx_state, /*update_wtx=*/nullptr, rescanning_old_block);
            if (!wtx) {
                // Can only be nullptr if there was a db write error (missing db, read-only db or a db engine internal writing error).
                // As we only store arriving transaction in this process, and we don't want an inconsistent state, let's throw an error.
                throw std::runtime_error("DB error adding transaction to wallet, write failed");
            }
            return true;
        }
    }
    return false;
}
 
bool CWallet::TransactionCanBeAbandoned(const Txid& hashTx) const
{
    LOCK(cs_wallet);
    const CWalletTx* wtx = GetWalletTx(hashTx);
    return wtx && !wtx->isAbandoned() && GetTxDepthInMainChain(*wtx) == 0 && !wtx->InMempool();
}
 
void CWallet::UpdateTrucSiblingConflicts(const CWalletTx& parent_wtx, const Txid& child_txid, bool add_conflict) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet)
{
    // Find all other txs in our wallet that spend utxos from this parent
    // so that we can mark them as mempool-conflicted by this new tx.
    for (long unsigned int i = 0; i < parent_wtx.tx->vout.size(); i++) {
        for (auto range = mapTxSpends.equal_range(COutPoint(parent_wtx.tx->GetHash(), i)); range.first != range.second; range.first++) {
            const Txid& sibling_txid = range.first->second;
            // Skip the child_tx itself
            if (sibling_txid == child_txid) continue;
            RecursiveUpdateTxState(/*batch=*/nullptr, sibling_txid, [&child_txid, add_conflict](CWalletTx& wtx) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet) {
                return add_conflict ? (wtx.mempool_conflicts.insert(child_txid).second ? TxUpdate::CHANGED : TxUpdate::UNCHANGED)
                                    : (wtx.mempool_conflicts.erase(child_txid) ? TxUpdate::CHANGED : TxUpdate::UNCHANGED);
            });
        }
    }
}
 
void CWallet::MarkInputsDirty(const CTransactionRef& tx)
{
    for (const CTxIn& txin : tx->vin) {
        auto it = mapWallet.find(txin.prevout.hash);
        if (it != mapWallet.end()) {
            it->second.MarkDirty();
        }
    }
}
 
bool CWallet::AbandonTransaction(const Txid& hashTx)
{
    LOCK(cs_wallet);
    auto it = mapWallet.find(hashTx);
    assert(it != mapWallet.end());
    return AbandonTransaction(it->second);
}
 
bool CWallet::AbandonTransaction(CWalletTx& tx)
{
    // Can't mark abandoned if confirmed or in mempool
    if (GetTxDepthInMainChain(tx) != 0 || tx.InMempool()) {
        return false;
    }
 
    auto try_updating_state = [](CWalletTx& wtx) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet) {
        // If the orig tx was not in block/mempool, none of its spends can be.
        assert(!wtx.isConfirmed());
        assert(!wtx.InMempool());
        // If already conflicted or abandoned, no need to set abandoned
        if (!wtx.isBlockConflicted() && !wtx.isAbandoned()) {
            wtx.m_state = TxStateInactive{/*abandoned=*/true};
            return TxUpdate::NOTIFY_CHANGED;
        }
        return TxUpdate::UNCHANGED;
    };
 
    // Iterate over all its outputs, and mark transactions in the wallet that spend them abandoned too.
    // States are not permanent, so these transactions can become unabandoned if they are re-added to the
    // mempool, or confirmed in a block, or conflicted.
    // Note: If the reorged coinbase is re-added to the main chain, the descendants that have not had their
    // states change will remain abandoned and will require manual broadcast if the user wants them.
 
    RecursiveUpdateTxState(tx.GetHash(), try_updating_state);
 
    return true;
}
 
void CWallet::MarkConflicted(const uint256& hashBlock, int conflicting_height, const Txid& hashTx)
{
    LOCK(cs_wallet);
 
    // If number of conflict confirms cannot be determined, this means
    // that the block is still unknown or not yet part of the main chain,
    // for example when loading the wallet during a reindex. Do nothing in that
    // case.
    if (m_last_block_processed_height < 0 || conflicting_height < 0) {
        return;
    }
    int conflictconfirms = (m_last_block_processed_height - conflicting_height + 1) * -1;
    if (conflictconfirms >= 0)
        return;
 
    auto try_updating_state = [&](CWalletTx& wtx) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet) {
        if (conflictconfirms < GetTxDepthInMainChain(wtx)) {
            // Block is 'more conflicted' than current confirm; update.
            // Mark transaction as conflicted with this block.
            wtx.m_state = TxStateBlockConflicted{hashBlock, conflicting_height};
            return TxUpdate::CHANGED;
        }
        return TxUpdate::UNCHANGED;
    };
 
    // Iterate over all its outputs, and mark transactions in the wallet that spend them conflicted too.
    RecursiveUpdateTxState(hashTx, try_updating_state);
 
}
 
void CWallet::RecursiveUpdateTxState(const Txid& tx_hash, const TryUpdatingStateFn& try_updating_state) {
    WalletBatch batch(GetDatabase());
    RecursiveUpdateTxState(&batch, tx_hash, try_updating_state);
}
 
void CWallet::RecursiveUpdateTxState(WalletBatch* batch, const Txid& tx_hash, const TryUpdatingStateFn& try_updating_state) {
    std::set<Txid> todo;
    std::set<Txid> done;
 
    todo.insert(tx_hash);
 
    while (!todo.empty()) {
        Txid now = *todo.begin();
        todo.erase(now);
        done.insert(now);
        auto it = mapWallet.find(now);
        assert(it != mapWallet.end());
        CWalletTx& wtx = it->second;
 
        TxUpdate update_state = try_updating_state(wtx);
        if (update_state != TxUpdate::UNCHANGED) {
            wtx.MarkDirty();
            if (batch) batch->WriteTx(wtx);
            // Iterate over all its outputs, and update those tx states as well (if applicable)
            for (unsigned int i = 0; i < wtx.tx->vout.size(); ++i) {
                std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range = mapTxSpends.equal_range(COutPoint(now, i));
                for (TxSpends::const_iterator iter = range.first; iter != range.second; ++iter) {
                    if (!done.contains(iter->second)) {
                        todo.insert(iter->second);
                    }
                }
            }
 
            if (update_state == TxUpdate::NOTIFY_CHANGED) {
                NotifyTransactionChanged(wtx.GetHash(), CT_UPDATED);
            }
 
            // If a transaction changes its tx state, that usually changes the balance
            // available of the outputs it spends. So force those to be recomputed
            MarkInputsDirty(wtx.tx);
        }
    }
}
 
bool CWallet::SyncTransaction(const CTransactionRef& ptx, const SyncTxState& state, bool update_tx, bool rescanning_old_block)
{
    if (!AddToWalletIfInvolvingMe(ptx, state, update_tx, rescanning_old_block))
        return false; // Not one of ours
 
    // If a transaction changes 'conflicted' state, that changes the balance
    // available of the outputs it spends. So force those to be
    // recomputed, also:
    MarkInputsDirty(ptx);
    return true;
}
 
void CWallet::transactionAddedToMempool(const CTransactionRef& tx) {
    LOCK(cs_wallet);
    SyncTransaction(tx, TxStateInMempool{});
 
    auto it = mapWallet.find(tx->GetHash());
    if (it != mapWallet.end()) {
        RefreshMempoolStatus(it->second, chain());
    }
 
    const Txid& txid = tx->GetHash();
 
    for (const CTxIn& tx_in : tx->vin) {
        // For each wallet transaction spending this prevout..
        for (auto range = mapTxSpends.equal_range(tx_in.prevout); range.first != range.second; range.first++) {
            const Txid& spent_id = range.first->second;
            // Skip the recently added tx
            if (spent_id == txid) continue;
            RecursiveUpdateTxState(/*batch=*/nullptr, spent_id, [&txid](CWalletTx& wtx) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet) {
                return wtx.mempool_conflicts.insert(txid).second ? TxUpdate::CHANGED : TxUpdate::UNCHANGED;
            });
        }
 
    }
 
    if (tx->version == TRUC_VERSION) {
        // Unconfirmed TRUC transactions are only allowed a 1-parent-1-child topology.
        // For any unconfirmed v3 parents (there should be a maximum of 1 except in reorgs),
        // record this child so the wallet doesn't try to spend any other outputs
        for (const CTxIn& tx_in : tx->vin) {
            auto parent_it = mapWallet.find(tx_in.prevout.hash);
            if (parent_it != mapWallet.end()) {
                CWalletTx& parent_wtx = parent_it->second;
                if (parent_wtx.isUnconfirmed()) {
                    parent_wtx.truc_child_in_mempool = tx->GetHash();
                    // Even though these siblings do not spend the same utxos, they can't
                    // be present in the mempool at the same time because of TRUC policy rules
                    UpdateTrucSiblingConflicts(parent_wtx, txid, /*add_conflict=*/true);
                }
            }
        }
    }
}
 
void CWallet::transactionRemovedFromMempool(const CTransactionRef& tx, MemPoolRemovalReason reason) {
    LOCK(cs_wallet);
    auto it = mapWallet.find(tx->GetHash());
    if (it != mapWallet.end()) {
        RefreshMempoolStatus(it->second, chain());
    }
    // Handle transactions that were removed from the mempool because they
    // conflict with transactions in a newly connected block.
    if (reason == MemPoolRemovalReason::CONFLICT) {
        // Trigger external -walletnotify notifications for these transactions.
        // Set Status::UNCONFIRMED instead of Status::CONFLICTED for a few reasons:
        //
        // 1. The transactionRemovedFromMempool callback does not currently
        //    provide the conflicting block's hash and height, and for backwards
        //    compatibility reasons it may not be not safe to store conflicted
        //    wallet transactions with a null block hash. See
        //    https://github.com/bitcoin/bitcoin/pull/18600#discussion_r420195993.
        // 2. For most of these transactions, the wallet's internal conflict
        //    detection in the blockConnected handler will subsequently call
        //    MarkConflicted and update them with CONFLICTED status anyway. This
        //    applies to any wallet transaction that has inputs spent in the
        //    block, or that has ancestors in the wallet with inputs spent by
        //    the block.
        // 3. Longstanding behavior since the sync implementation in
        //    https://github.com/bitcoin/bitcoin/pull/9371 and the prior sync
        //    implementation before that was to mark these transactions
        //    unconfirmed rather than conflicted.
        //
        // Nothing described above should be seen as an unchangeable requirement
        // when improving this code in the future. The wallet's heuristics for
        // distinguishing between conflicted and unconfirmed transactions are
        // imperfect, and could be improved in general, see
        // https://github.com/bitcoin-core/bitcoin-devwiki/wiki/Wallet-Transaction-Conflict-Tracking
        SyncTransaction(tx, TxStateInactive{});
    }
 
    const Txid& txid = tx->GetHash();
 
    for (const CTxIn& tx_in : tx->vin) {
        // Iterate over all wallet transactions spending txin.prev
        // and recursively mark them as no longer conflicting with
        // txid
        for (auto range = mapTxSpends.equal_range(tx_in.prevout); range.first != range.second; range.first++) {
            const Txid& spent_id = range.first->second;
 
            RecursiveUpdateTxState(/*batch=*/nullptr, spent_id, [&txid](CWalletTx& wtx) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet) {
                return wtx.mempool_conflicts.erase(txid) ? TxUpdate::CHANGED : TxUpdate::UNCHANGED;
            });
        }
    }
 
    if (tx->version == TRUC_VERSION) {
        // If this tx has a parent, unset its truc_child_in_mempool to make it possible
        // to spend from the parent again. If this tx was replaced by another
        // child of the same parent, transactionAddedToMempool
        // will update truc_child_in_mempool
        for (const CTxIn& tx_in : tx->vin) {
            auto parent_it = mapWallet.find(tx_in.prevout.hash);
            if (parent_it != mapWallet.end()) {
                CWalletTx& parent_wtx = parent_it->second;
                if (parent_wtx.truc_child_in_mempool == tx->GetHash()) {
                    parent_wtx.truc_child_in_mempool = std::nullopt;
                    UpdateTrucSiblingConflicts(parent_wtx, txid, /*add_conflict=*/false);
                }
            }
        }
    }
}
 
void CWallet::blockConnected(const ChainstateRole& role, const interfaces::BlockInfo& block)
{
    if (role.historical) {
        return;
    }
    assert(block.data);
    LOCK(cs_wallet);
 
    // Update the best block in memory first. This will set the best block's height, which is
    // needed by MarkConflicted.
    SetLastBlockProcessedInMem(block.height, block.hash);
 
    // No need to scan block if it was created before the wallet birthday.
    // Uses chain max time and twice the grace period to adjust time for block time variability.
    if (block.chain_time_max < m_birth_time.load() - (TIMESTAMP_WINDOW * 2)) return;
 
    // Scan block
    bool wallet_updated = false;
    for (size_t index = 0; index < block.data->vtx.size(); index++) {
        wallet_updated |= SyncTransaction(block.data->vtx[index], TxStateConfirmed{block.hash, block.height, static_cast<int>(index)});
        transactionRemovedFromMempool(block.data->vtx[index], MemPoolRemovalReason::BLOCK);
    }
 
    // Update on disk if this block resulted in us updating a tx, or periodically every 144 blocks (~1 day)
    if (wallet_updated || block.height % 144 == 0) {
        WriteBestBlock();
    }
}
 
void CWallet::blockDisconnected(const interfaces::BlockInfo& block)
{
    assert(block.data);
    LOCK(cs_wallet);
 
    // At block disconnection, this will change an abandoned transaction to
    // be unconfirmed, whether or not the transaction is added back to the mempool.
    // User may have to call abandontransaction again. It may be addressed in the
    // future with a stickier abandoned state or even removing abandontransaction call.
    int disconnect_height = block.height;
 
    for (size_t index = 0; index < block.data->vtx.size(); index++) {
        const CTransactionRef& ptx = block.data->vtx[index];
        // Coinbase transactions are not only inactive but also abandoned,
        // meaning they should never be relayed standalone via the p2p protocol.
        SyncTransaction(ptx, TxStateInactive{/*abandoned=*/index == 0});
 
        for (const CTxIn& tx_in : ptx->vin) {
            // No other wallet transactions conflicted with this transaction
            if (!mapTxSpends.contains(tx_in.prevout)) continue;
 
            std::pair<TxSpends::const_iterator, TxSpends::const_iterator> range = mapTxSpends.equal_range(tx_in.prevout);
 
            // For all of the spends that conflict with this transaction
            for (TxSpends::const_iterator _it = range.first; _it != range.second; ++_it) {
                CWalletTx& wtx = mapWallet.find(_it->second)->second;
 
                if (!wtx.isBlockConflicted()) continue;
 
                auto try_updating_state = [&](CWalletTx& tx) {
                    if (!tx.isBlockConflicted()) return TxUpdate::UNCHANGED;
                    if (tx.state<TxStateBlockConflicted>()->conflicting_block_height >= disconnect_height) {
                        tx.m_state = TxStateInactive{};
                        return TxUpdate::CHANGED;
                    }
                    return TxUpdate::UNCHANGED;
                };
 
                RecursiveUpdateTxState(wtx.tx->GetHash(), try_updating_state);
            }
        }
    }
 
    // Update the best block
    SetLastBlockProcessed(block.height - 1, *Assert(block.prev_hash));
}
 
void CWallet::updatedBlockTip()
{
    m_best_block_time = GetTime();
}
 
void CWallet::BlockUntilSyncedToCurrentChain() const {
    AssertLockNotHeld(cs_wallet);
    // Skip the queue-draining stuff if we know we're caught up with
    // chain().Tip(), otherwise put a callback in the validation interface queue and wait
    // for the queue to drain enough to execute it (indicating we are caught up
    // at least with the time we entered this function).
    uint256 last_block_hash = WITH_LOCK(cs_wallet, return m_last_block_processed);
    chain().waitForNotificationsIfTipChanged(last_block_hash);
}
 
// Note that this function doesn't distinguish between a 0-valued input,
// and a not-"is mine" input.
CAmount CWallet::GetDebit(const CTxIn &txin) const
{
    LOCK(cs_wallet);
    auto txo = GetTXO(txin.prevout);
    if (txo) {
        return txo->GetTxOut().nValue;
    }
    return 0;
}
 
bool CWallet::IsMine(const CTxOut& txout) const
{
    AssertLockHeld(cs_wallet);
    return IsMine(txout.scriptPubKey);
}
 
bool CWallet::IsMine(const CTxDestination& dest) const
{
    AssertLockHeld(cs_wallet);
    return IsMine(GetScriptForDestination(dest));
}
 
bool CWallet::IsMine(const CScript& script) const
{
    AssertLockHeld(cs_wallet);
 
    // Search the cache so that IsMine is called only on the relevant SPKMs instead of on everything in m_spk_managers
    const auto& it = m_cached_spks.find(script);
    if (it != m_cached_spks.end()) {
        bool res = false;
        for (const auto& spkm : it->second) {
            res = res || spkm->IsMine(script);
        }
        Assume(res);
        return res;
    }
 
    return false;
}
 
bool CWallet::IsMine(const CTransaction& tx) const
{
    AssertLockHeld(cs_wallet);
    for (const CTxOut& txout : tx.vout)
        if (IsMine(txout))
            return true;
    return false;
}
 
bool CWallet::IsMine(const COutPoint& outpoint) const
{
    AssertLockHeld(cs_wallet);
    auto wtx = GetWalletTx(outpoint.hash);
    if (!wtx) {
        return false;
    }
    if (outpoint.n >= wtx->tx->vout.size()) {
        return false;
    }
    return IsMine(wtx->tx->vout[outpoint.n]);
}
 
bool CWallet::IsFromMe(const CTransaction& tx) const
{
    LOCK(cs_wallet);
    for (const CTxIn& txin : tx.vin) {
        if (GetTXO(txin.prevout)) return true;
    }
    return false;
}
 
CAmount CWallet::GetDebit(const CTransaction& tx) const
{
    CAmount nDebit = 0;
    for (const CTxIn& txin : tx.vin)
    {
        nDebit += GetDebit(txin);
        if (!MoneyRange(nDebit))
            throw std::runtime_error(std::string(__func__) + ": value out of range");
    }
    return nDebit;
}
 
bool CWallet::IsHDEnabled() const
{
    // All Active ScriptPubKeyMans must be HD for this to be true
    bool result = false;
    for (const auto& spk_man : GetActiveScriptPubKeyMans()) {
        if (!spk_man->IsHDEnabled()) return false;
        result = true;
    }
    return result;
}
 
bool CWallet::CanGetAddresses(bool internal) const
{
    LOCK(cs_wallet);
    if (m_spk_managers.empty()) return false;
    for (OutputType t : OUTPUT_TYPES) {
        auto spk_man = GetScriptPubKeyMan(t, internal);
        if (spk_man && spk_man->CanGetAddresses(internal)) {
            return true;
        }
    }
    return false;
}
 
void CWallet::SetWalletFlag(uint64_t flags)
{
    WalletBatch batch(GetDatabase());
    return SetWalletFlagWithDB(batch, flags);
}
 
void CWallet::SetWalletFlagWithDB(WalletBatch& batch, uint64_t flags)
{
    LOCK(cs_wallet);
    m_wallet_flags |= flags;
    if (!batch.WriteWalletFlags(m_wallet_flags))
        throw std::runtime_error(std::string(__func__) + ": writing wallet flags failed");
}
 
void CWallet::UnsetWalletFlag(uint64_t flag)
{
    WalletBatch batch(GetDatabase());
    UnsetWalletFlagWithDB(batch, flag);
}
 
void CWallet::UnsetWalletFlagWithDB(WalletBatch& batch, uint64_t flag)
{
    LOCK(cs_wallet);
    m_wallet_flags &= ~flag;
    if (!batch.WriteWalletFlags(m_wallet_flags))
        throw std::runtime_error(std::string(__func__) + ": writing wallet flags failed");
}
 
void CWallet::UnsetBlankWalletFlag(WalletBatch& batch)
{
    UnsetWalletFlagWithDB(batch, WALLET_FLAG_BLANK_WALLET);
}
 
bool CWallet::IsWalletFlagSet(uint64_t flag) const
{
    return (m_wallet_flags & flag);
}
 
bool CWallet::LoadWalletFlags(uint64_t flags)
{
    LOCK(cs_wallet);
    if (((flags & KNOWN_WALLET_FLAGS) >> 32) ^ (flags >> 32)) {
        // contains unknown non-tolerable wallet flags
        return false;
    }
    m_wallet_flags = flags;
 
    return true;
}
 
void CWallet::InitWalletFlags(uint64_t flags)
{
    LOCK(cs_wallet);
 
    // We should never be writing unknown non-tolerable wallet flags
    assert(((flags & KNOWN_WALLET_FLAGS) >> 32) == (flags >> 32));
    // This should only be used once, when creating a new wallet - so current flags are expected to be blank
    assert(m_wallet_flags == 0);
 
    if (!WalletBatch(GetDatabase()).WriteWalletFlags(flags)) {
        throw std::runtime_error(std::string(__func__) + ": writing wallet flags failed");
    }
 
    if (!LoadWalletFlags(flags)) assert(false);
}
 
uint64_t CWallet::GetWalletFlags() const
{
    return m_wallet_flags;
}
 
void CWallet::MaybeUpdateBirthTime(int64_t time)
{
    int64_t birthtime = m_birth_time.load();
    if (time < birthtime) {
        m_birth_time = time;
    }
}
 
int64_t CWallet::RescanFromTime(int64_t startTime, const WalletRescanReserver& reserver, bool update)
{
    // Find starting block. May be null if nCreateTime is greater than the
    // highest blockchain timestamp, in which case there is nothing that needs
    // to be scanned.
    int start_height = 0;
    uint256 start_block;
    bool start = chain().findFirstBlockWithTimeAndHeight(startTime - TIMESTAMP_WINDOW, 0, FoundBlock().hash(start_block).height(start_height));
    WalletLogPrintf("%s: Rescanning last %i blocks\n", __func__, start ? WITH_LOCK(cs_wallet, return GetLastBlockHeight()) - start_height + 1 : 0);
 
    if (start) {
        // TODO: this should take into account failure by ScanResult::USER_ABORT
        ScanResult result = ScanForWalletTransactions(start_block, start_height, /*max_height=*/{}, reserver, /*fUpdate=*/update, /*save_progress=*/false);
        if (result.status == ScanResult::FAILURE) {
            int64_t time_max;
            CHECK_NONFATAL(chain().findBlock(result.last_failed_block, FoundBlock().maxTime(time_max)));
            return time_max + TIMESTAMP_WINDOW + 1;
        }
    }
    return startTime;
}
 
CWallet::ScanResult CWallet::ScanForWalletTransactions(const uint256& start_block, int start_height, std::optional<int> max_height, const WalletRescanReserver& reserver, bool fUpdate, const bool save_progress)
{
    constexpr auto INTERVAL_TIME{60s};
    auto current_time{reserver.now()};
    auto start_time{reserver.now()};
 
    assert(reserver.isReserved());
 
    uint256 block_hash = start_block;
    ScanResult result;
 
    std::unique_ptr<FastWalletRescanFilter> fast_rescan_filter;
    if (chain().hasBlockFilterIndex(BlockFilterType::BASIC)) fast_rescan_filter = std::make_unique<FastWalletRescanFilter>(*this);
 
    WalletLogPrintf("Rescan started from block %s... (%s)\n", start_block.ToString(),
                    fast_rescan_filter ? "fast variant using block filters" : "slow variant inspecting all blocks");
 
    fAbortRescan = false;
    ShowProgress(strprintf("[%s] %s", DisplayName(), _("Rescanning…")), 0); // show rescan progress in GUI as dialog or on splashscreen, if rescan required on startup (e.g. due to corruption)
    uint256 tip_hash = WITH_LOCK(cs_wallet, return GetLastBlockHash());
    uint256 end_hash = tip_hash;
    if (max_height) chain().findAncestorByHeight(tip_hash, *max_height, FoundBlock().hash(end_hash));
    double progress_begin = chain().guessVerificationProgress(block_hash);
    double progress_end = chain().guessVerificationProgress(end_hash);
    double progress_current = progress_begin;
    int block_height = start_height;
    while (!fAbortRescan && !chain().shutdownRequested()) {
        if (progress_end - progress_begin > 0.0) {
            m_scanning_progress = (progress_current - progress_begin) / (progress_end - progress_begin);
        } else { // avoid divide-by-zero for single block scan range (i.e. start and stop hashes are equal)
            m_scanning_progress = 0;
        }
        if (block_height % 100 == 0 && progress_end - progress_begin > 0.0) {
            ShowProgress(strprintf("[%s] %s", DisplayName(), _("Rescanning…")), std::max(1, std::min(99, (int)(m_scanning_progress * 100))));
        }
 
        bool next_interval = reserver.now() >= current_time + INTERVAL_TIME;
        if (next_interval) {
            current_time = reserver.now();
            WalletLogPrintf("Still rescanning. At block %d. Progress=%f\n", block_height, progress_current);
        }
 
        bool fetch_block{true};
        if (fast_rescan_filter) {
            fast_rescan_filter->UpdateIfNeeded();
            auto matches_block{fast_rescan_filter->MatchesBlock(block_hash)};
            if (matches_block.has_value()) {
                if (*matches_block) {
                    LogDebug(BCLog::SCAN, "Fast rescan: inspect block %d [%s] (filter matched)\n", block_height, block_hash.ToString());
                } else {
                    result.last_scanned_block = block_hash;
                    result.last_scanned_height = block_height;
                    fetch_block = false;
                }
            } else {
                LogDebug(BCLog::SCAN, "Fast rescan: inspect block %d [%s] (WARNING: block filter not found!)\n", block_height, block_hash.ToString());
            }
        }
 
        // Find next block separately from reading data above, because reading
        // is slow and there might be a reorg while it is read.
        bool block_still_active = false;
        bool next_block = false;
        uint256 next_block_hash;
        chain().findBlock(block_hash, FoundBlock().inActiveChain(block_still_active).nextBlock(FoundBlock().inActiveChain(next_block).hash(next_block_hash)));
 
        if (fetch_block) {
            // Read block data and locator if needed (the locator is usually null unless we need to save progress)
            CBlock block;
            CBlockLocator loc;
            // Find block
            FoundBlock found_block{FoundBlock().data(block)};
            if (save_progress && next_interval) found_block.locator(loc);
            chain().findBlock(block_hash, found_block);
 
            if (!block.IsNull()) {
                LOCK(cs_wallet);
                if (!block_still_active) {
                    // Abort scan if current block is no longer active, to prevent
                    // marking transactions as coming from the wrong block.
                    result.last_failed_block = block_hash;
                    result.status = ScanResult::FAILURE;
                    break;
                }
                for (size_t posInBlock = 0; posInBlock < block.vtx.size(); ++posInBlock) {
                    SyncTransaction(block.vtx[posInBlock], TxStateConfirmed{block_hash, block_height, static_cast<int>(posInBlock)}, fUpdate, /*rescanning_old_block=*/true);
                }
                // scan succeeded, record block as most recent successfully scanned
                result.last_scanned_block = block_hash;
                result.last_scanned_height = block_height;
 
                if (!loc.IsNull()) {
                    WalletLogPrintf("Saving scan progress %d.\n", block_height);
                    WalletBatch batch(GetDatabase());
                    batch.WriteBestBlock(loc);
                }
            } else {
                // could not scan block, keep scanning but record this block as the most recent failure
                result.last_failed_block = block_hash;
                result.status = ScanResult::FAILURE;
            }
        }
        if (max_height && block_height >= *max_height) {
            break;
        }
        // If rescanning was triggered with cs_wallet permanently locked (AttachChain), additional blocks that were connected during the rescan
        // aren't processed here but will be processed with the pending blockConnected notifications after the lock is released.
        // If rescanning without a permanent cs_wallet lock, additional blocks that were added during the rescan will be re-processed if
        // the notification was processed and the last block height was updated.
        if (block_height >= WITH_LOCK(cs_wallet, return GetLastBlockHeight())) {
            break;
        }
 
        {
            if (!next_block) {
                // break successfully when rescan has reached the tip, or
                // previous block is no longer on the chain due to a reorg
                break;
            }
 
            // increment block and verification progress
            block_hash = next_block_hash;
            ++block_height;
            progress_current = chain().guessVerificationProgress(block_hash);
 
            // handle updated tip hash
            const uint256 prev_tip_hash = tip_hash;
            tip_hash = WITH_LOCK(cs_wallet, return GetLastBlockHash());
            if (!max_height && prev_tip_hash != tip_hash) {
                // in case the tip has changed, update progress max
                progress_end = chain().guessVerificationProgress(tip_hash);
            }
        }
    }
    if (!max_height) {
        WalletLogPrintf("Scanning current mempool transactions.\n");
        WITH_LOCK(cs_wallet, chain().requestMempoolTransactions(*this));
    }
    ShowProgress(strprintf("[%s] %s", DisplayName(), _("Rescanning…")), 100); // hide progress dialog in GUI
    if (block_height && fAbortRescan) {
        WalletLogPrintf("Rescan aborted at block %d. Progress=%f\n", block_height, progress_current);
        result.status = ScanResult::USER_ABORT;
    } else if (block_height && chain().shutdownRequested()) {
        WalletLogPrintf("Rescan interrupted by shutdown request at block %d. Progress=%f\n", block_height, progress_current);
        result.status = ScanResult::USER_ABORT;
    } else {
        WalletLogPrintf("Rescan completed in %15dms\n", Ticks<std::chrono::milliseconds>(reserver.now() - start_time));
    }
    return result;
}
 
bool CWallet::SubmitTxMemoryPoolAndRelay(CWalletTx& wtx,
                                         std::string& err_string,
                                         node::TxBroadcast broadcast_method) const
{
    AssertLockHeld(cs_wallet);
 
    // Can't relay if wallet is not broadcasting
    if (!GetBroadcastTransactions()) return false;
    // Don't relay abandoned transactions
    if (wtx.isAbandoned()) return false;
    // Don't try to submit coinbase transactions. These would fail anyway but would
    // cause log spam.
    if (wtx.IsCoinBase()) return false;
    // Don't try to submit conflicted or confirmed transactions.
    if (GetTxDepthInMainChain(wtx) != 0) return false;
 
    const char* what{""};
    switch (broadcast_method) {
    case node::TxBroadcast::MEMPOOL_AND_BROADCAST_TO_ALL:
        what = "to mempool and for broadcast to peers";
        break;
    case node::TxBroadcast::MEMPOOL_NO_BROADCAST:
        what = "to mempool without broadcast";
        break;
    case node::TxBroadcast::NO_MEMPOOL_PRIVATE_BROADCAST:
        what = "for private broadcast without adding to the mempool";
        break;
    }
    WalletLogPrintf("Submitting wtx %s %s\n", wtx.GetHash().ToString(), what);
    // We must set TxStateInMempool here. Even though it will also be set later by the
    // entered-mempool callback, if we did not there would be a race where a
    // user could call sendmoney in a loop and hit spurious out of funds errors
    // because we think that this newly generated transaction's change is
    // unavailable as we're not yet aware that it is in the mempool.
    //
    // If broadcast fails for any reason, trying to set wtx.m_state here would be incorrect.
    // If transaction was previously in the mempool, it should be updated when
    // TransactionRemovedFromMempool fires.
    bool ret = chain().broadcastTransaction(wtx.tx, m_default_max_tx_fee, broadcast_method, err_string);
    if (ret) wtx.m_state = TxStateInMempool{};
    return ret;
}
 
std::set<Txid> CWallet::GetTxConflicts(const CWalletTx& wtx) const
{
    AssertLockHeld(cs_wallet);
 
    const Txid myHash{wtx.GetHash()};
    std::set<Txid> result{GetConflicts(myHash)};
    result.erase(myHash);
    return result;
}
 
bool CWallet::ShouldResend() const
{
    // Don't attempt to resubmit if the wallet is configured to not broadcast
    if (!fBroadcastTransactions) return false;
 
    // During reindex, importing and IBD, old wallet transactions become
    // unconfirmed. Don't resend them as that would spam other nodes.
    // We only allow forcing mempool submission when not relaying to avoid this spam.
    if (!chain().isReadyToBroadcast()) return false;
 
    // Do this infrequently and randomly to avoid giving away
    // that these are our transactions.
    if (NodeClock::now() < m_next_resend) return false;
 
    return true;
}
 
NodeClock::time_point CWallet::GetDefaultNextResend() { return FastRandomContext{}.rand_uniform_delay(NodeClock::now() + 12h, 24h); }
 
// Resubmit transactions from the wallet to the mempool, optionally asking the
// mempool to relay them. On startup, we will do this for all unconfirmed
// transactions but will not ask the mempool to relay them. We do this on startup
// to ensure that our own mempool is aware of our transactions. There
// is a privacy side effect here as not broadcasting on startup also means that we won't
// inform the world of our wallet's state, particularly if the wallet (or node) is not
// yet synced.
//
// Otherwise this function is called periodically in order to relay our unconfirmed txs.
// We do this on a random timer to slightly obfuscate which transactions
// come from our wallet.
//
// TODO: Ideally, we'd only resend transactions that we think should have been
// mined in the most recent block. Any transaction that wasn't in the top
// blockweight of transactions in the mempool shouldn't have been mined,
// and so is probably just sitting in the mempool waiting to be confirmed.
// Rebroadcasting does nothing to speed up confirmation and only damages
// privacy.
//
// The `force` option results in all unconfirmed transactions being submitted to
// the mempool. This does not necessarily result in those transactions being relayed,
// that depends on the `broadcast_method` option. Periodic rebroadcast uses the pattern
// broadcast_method=TxBroadcast::MEMPOOL_AND_BROADCAST_TO_ALL force=false, while loading into
// the mempool (on start, or after import) uses
// broadcast_method=TxBroadcast::MEMPOOL_NO_BROADCAST force=true.
void CWallet::ResubmitWalletTransactions(node::TxBroadcast broadcast_method, bool force)
{
    // Don't attempt to resubmit if the wallet is configured to not broadcast,
    // even if forcing.
    if (!fBroadcastTransactions) return;
 
    int submitted_tx_count = 0;
 
    { // cs_wallet scope
        LOCK(cs_wallet);
 
        // First filter for the transactions we want to rebroadcast.
        // We use a set with WalletTxOrderComparator so that rebroadcasting occurs in insertion order
        std::set<CWalletTx*, WalletTxOrderComparator> to_submit;
        for (auto& [txid, wtx] : mapWallet) {
            // Only rebroadcast unconfirmed txs
            if (!wtx.isUnconfirmed()) continue;
 
            // Attempt to rebroadcast all txes more than 5 minutes older than
            // the last block, or all txs if forcing.
            if (!force && wtx.nTimeReceived > m_best_block_time - 5 * 60) continue;
            to_submit.insert(&wtx);
        }
        // Now try submitting the transactions to the memory pool and (optionally) relay them.
        for (auto wtx : to_submit) {
            std::string unused_err_string;
            if (SubmitTxMemoryPoolAndRelay(*wtx, unused_err_string, broadcast_method)) ++submitted_tx_count;
        }
    } // cs_wallet
 
    if (submitted_tx_count > 0) {
        WalletLogPrintf("%s: resubmit %u unconfirmed transactions\n", __func__, submitted_tx_count);
    }
}
 // end of mapWallet
 
void MaybeResendWalletTxs(WalletContext& context)
{
    for (const std::shared_ptr<CWallet>& pwallet : GetWallets(context)) {
        if (!pwallet->ShouldResend()) continue;
        pwallet->ResubmitWalletTransactions(node::TxBroadcast::MEMPOOL_AND_BROADCAST_TO_ALL, /*force=*/false);
        pwallet->SetNextResend();
    }
}
 
 
bool CWallet::SignTransaction(CMutableTransaction& tx) const
{
    AssertLockHeld(cs_wallet);
 
    // Build coins map
    std::map<COutPoint, Coin> coins;
    for (auto& input : tx.vin) {
        const auto mi = mapWallet.find(input.prevout.hash);
        if(mi == mapWallet.end() || input.prevout.n >= mi->second.tx->vout.size()) {
            return false;
        }
        const CWalletTx& wtx = mi->second;
        int prev_height = wtx.state<TxStateConfirmed>() ? wtx.state<TxStateConfirmed>()->confirmed_block_height : 0;
        coins[input.prevout] = Coin(wtx.tx->vout[input.prevout.n], prev_height, wtx.IsCoinBase());
    }
    std::map<int, bilingual_str> input_errors;
    return SignTransaction(tx, coins, SIGHASH_DEFAULT, input_errors);
}
 
bool CWallet::SignTransaction(CMutableTransaction& tx, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, bilingual_str>& input_errors) const
{
    // Try to sign with all ScriptPubKeyMans
    for (ScriptPubKeyMan* spk_man : GetAllScriptPubKeyMans()) {
        // spk_man->SignTransaction will return true if the transaction is complete,
        // so we can exit early and return true if that happens
        if (spk_man->SignTransaction(tx, coins, sighash, input_errors)) {
            return true;
        }
    }
 
    // At this point, one input was not fully signed otherwise we would have exited already
    return false;
}
 
std::optional<PSBTError> CWallet::FillPSBT(PartiallySignedTransaction& psbtx, bool& complete, std::optional<int> sighash_type, bool sign, bool bip32derivs, size_t * n_signed, bool finalize) const
{
    if (n_signed) {
        *n_signed = 0;
    }
    LOCK(cs_wallet);
    // Get all of the previous transactions
    for (unsigned int i = 0; i < psbtx.tx->vin.size(); ++i) {
        const CTxIn& txin = psbtx.tx->vin[i];
        PSBTInput& input = psbtx.inputs.at(i);
 
        if (PSBTInputSigned(input)) {
            continue;
        }
 
        // If we have no utxo, grab it from the wallet.
        if (!input.non_witness_utxo) {
            const Txid& txhash = txin.prevout.hash;
            const auto it = mapWallet.find(txhash);
            if (it != mapWallet.end()) {
                const CWalletTx& wtx = it->second;
                // We only need the non_witness_utxo, which is a superset of the witness_utxo.
                //   The signing code will switch to the smaller witness_utxo if this is ok.
                input.non_witness_utxo = wtx.tx;
            }
        }
    }
 
    const PrecomputedTransactionData txdata = PrecomputePSBTData(psbtx);
 
    // Fill in information from ScriptPubKeyMans
    for (ScriptPubKeyMan* spk_man : GetAllScriptPubKeyMans()) {
        int n_signed_this_spkm = 0;
        const auto error{spk_man->FillPSBT(psbtx, txdata, sighash_type, sign, bip32derivs, &n_signed_this_spkm, finalize)};
        if (error) {
            return error;
        }
 
        if (n_signed) {
            (*n_signed) += n_signed_this_spkm;
        }
    }
 
    RemoveUnnecessaryTransactions(psbtx);
 
    // Complete if every input is now signed
    complete = true;
    for (size_t i = 0; i < psbtx.inputs.size(); ++i) {
        complete &= PSBTInputSignedAndVerified(psbtx, i, &txdata);
    }
 
    return {};
}
 
SigningResult CWallet::SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const
{
    SignatureData sigdata;
    CScript script_pub_key = GetScriptForDestination(pkhash);
    for (const auto& spk_man_pair : m_spk_managers) {
        if (spk_man_pair.second->CanProvide(script_pub_key, sigdata)) {
            LOCK(cs_wallet);  // DescriptorScriptPubKeyMan calls IsLocked which can lock cs_wallet in a deadlocking order
            return spk_man_pair.second->SignMessage(message, pkhash, str_sig);
        }
    }
    return SigningResult::PRIVATE_KEY_NOT_AVAILABLE;
}
 
OutputType CWallet::TransactionChangeType(const std::optional<OutputType>& change_type, const std::vector<CRecipient>& vecSend) const
{
    // If -changetype is specified, always use that change type.
    if (change_type) {
        return *change_type;
    }
 
    // if m_default_address_type is legacy, use legacy address as change.
    if (m_default_address_type == OutputType::LEGACY) {
        return OutputType::LEGACY;
    }
 
    bool any_tr{false};
    bool any_wpkh{false};
    bool any_sh{false};
    bool any_pkh{false};
 
    for (const auto& recipient : vecSend) {
        if (std::get_if<WitnessV1Taproot>(&recipient.dest)) {
            any_tr = true;
        } else if (std::get_if<WitnessV0KeyHash>(&recipient.dest)) {
            any_wpkh = true;
        } else if (std::get_if<ScriptHash>(&recipient.dest)) {
            any_sh = true;
        } else if (std::get_if<PKHash>(&recipient.dest)) {
            any_pkh = true;
        }
    }
 
    const bool has_bech32m_spkman(GetScriptPubKeyMan(OutputType::BECH32M, /*internal=*/true));
    if (has_bech32m_spkman && any_tr) {
        // Currently tr is the only type supported by the BECH32M spkman
        return OutputType::BECH32M;
    }
    const bool has_bech32_spkman(GetScriptPubKeyMan(OutputType::BECH32, /*internal=*/true));
    if (has_bech32_spkman && any_wpkh) {
        // Currently wpkh is the only type supported by the BECH32 spkman
        return OutputType::BECH32;
    }
    const bool has_p2sh_segwit_spkman(GetScriptPubKeyMan(OutputType::P2SH_SEGWIT, /*internal=*/true));
    if (has_p2sh_segwit_spkman && any_sh) {
        // Currently sh_wpkh is the only type supported by the P2SH_SEGWIT spkman
        // As of 2021 about 80% of all SH are wrapping WPKH, so use that
        return OutputType::P2SH_SEGWIT;
    }
    const bool has_legacy_spkman(GetScriptPubKeyMan(OutputType::LEGACY, /*internal=*/true));
    if (has_legacy_spkman && any_pkh) {
        // Currently pkh is the only type supported by the LEGACY spkman
        return OutputType::LEGACY;
    }
 
    if (has_bech32m_spkman) {
        return OutputType::BECH32M;
    }
    if (has_bech32_spkman) {
        return OutputType::BECH32;
    }
    // else use m_default_address_type for change
    return m_default_address_type;
}
 
void CWallet::CommitTransaction(CTransactionRef tx, mapValue_t mapValue, std::vector<std::pair<std::string, std::string>> orderForm)
{
    LOCK(cs_wallet);
    WalletLogPrintf("CommitTransaction:\n%s\n", util::RemoveSuffixView(tx->ToString(), "\n"));
 
    // Add tx to wallet, because if it has change it's also ours,
    // otherwise just for transaction history.
    CWalletTx* wtx = AddToWallet(tx, TxStateInactive{}, [&](CWalletTx& wtx, bool new_tx) {
        CHECK_NONFATAL(wtx.mapValue.empty());
        CHECK_NONFATAL(wtx.vOrderForm.empty());
        wtx.mapValue = std::move(mapValue);
        wtx.vOrderForm = std::move(orderForm);
        return true;
    });
 
    // wtx can only be null if the db write failed.
    if (!wtx) {
        throw std::runtime_error(std::string(__func__) + ": Wallet db error, transaction commit failed");
    }
 
    // Notify that old coins are spent
    for (const CTxIn& txin : tx->vin) {
        CWalletTx &coin = mapWallet.at(txin.prevout.hash);
        coin.MarkDirty();
        NotifyTransactionChanged(coin.GetHash(), CT_UPDATED);
    }
 
    if (!fBroadcastTransactions) {
        // Don't submit tx to the mempool
        return;
    }
 
    std::string err_string;
    if (!SubmitTxMemoryPoolAndRelay(*wtx, err_string, node::TxBroadcast::MEMPOOL_AND_BROADCAST_TO_ALL)) {
        WalletLogPrintf("CommitTransaction(): Transaction cannot be broadcast immediately, %s\n", err_string);
        // TODO: if we expect the failure to be long term or permanent, instead delete wtx from the wallet and return failure.
    }
}
 
DBErrors CWallet::PopulateWalletFromDB(bilingual_str& error, std::vector<bilingual_str>& warnings)
{
    LOCK(cs_wallet);
 
    Assert(m_spk_managers.empty());
    Assert(m_wallet_flags == 0);
    DBErrors nLoadWalletRet = WalletBatch(GetDatabase()).LoadWallet(this);
 
    if (m_spk_managers.empty()) {
        assert(m_external_spk_managers.empty());
        assert(m_internal_spk_managers.empty());
    }
 
    const auto wallet_file = m_database->Filename();
    switch (nLoadWalletRet) {
    case DBErrors::LOAD_OK:
        break;
    case DBErrors::NONCRITICAL_ERROR:
        warnings.push_back(strprintf(_("Error reading %s! All keys read correctly, but transaction data"
                                       " or address metadata may be missing or incorrect."),
            wallet_file));
        break;
    case DBErrors::NEED_RESCAN:
        warnings.push_back(strprintf(_("Error reading %s! Transaction data may be missing or incorrect."
                                       " Rescanning wallet."), wallet_file));
        break;
    case DBErrors::CORRUPT:
        error = strprintf(_("Error loading %s: Wallet corrupted"), wallet_file);
        break;
    case DBErrors::TOO_NEW:
        error = strprintf(_("Error loading %s: Wallet requires newer version of %s"), wallet_file, CLIENT_NAME);
        break;
    case DBErrors::EXTERNAL_SIGNER_SUPPORT_REQUIRED:
        error = strprintf(_("Error loading %s: External signer wallet being loaded without external signer support compiled"), wallet_file);
        break;
    case DBErrors::UNKNOWN_DESCRIPTOR:
        error = strprintf(_("Unrecognized descriptor found. Loading wallet %s\n\n"
                            "The wallet might have been created on a newer version.\n"
                            "Please try running the latest software version.\n"), wallet_file);
        break;
    case DBErrors::UNEXPECTED_LEGACY_ENTRY:
        error = strprintf(_("Unexpected legacy entry in descriptor wallet found. Loading wallet %s\n\n"
                            "The wallet might have been tampered with or created with malicious intent.\n"), wallet_file);
        break;
    case DBErrors::LEGACY_WALLET:
        error = strprintf(_("Error loading %s: Wallet is a legacy wallet. Please migrate to a descriptor wallet using the migration tool (migratewallet RPC)."), wallet_file);
        break;
    case DBErrors::LOAD_FAIL:
        error = strprintf(_("Error loading %s"), wallet_file);
        break;
    } // no default case, so the compiler can warn about missing cases
    return nLoadWalletRet;
}
 
util::Result<void> CWallet::RemoveTxs(std::vector<Txid>& txs_to_remove)
{
    AssertLockHeld(cs_wallet);
    bilingual_str str_err;  // future: make RunWithinTxn return a util::Result
    bool was_txn_committed = RunWithinTxn(GetDatabase(), /*process_desc=*/"remove transactions", [&](WalletBatch& batch) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet) {
        util::Result<void> result{RemoveTxs(batch, txs_to_remove)};
        if (!result) str_err = util::ErrorString(result);
        return result.has_value();
    });
    if (!str_err.empty()) return util::Error{str_err};
    if (!was_txn_committed) return util::Error{_("Error starting/committing db txn for wallet transactions removal process")};
    return {}; // all good
}
 
util::Result<void> CWallet::RemoveTxs(WalletBatch& batch, std::vector<Txid>& txs_to_remove)
{
    AssertLockHeld(cs_wallet);
    if (!batch.HasActiveTxn()) return util::Error{strprintf(_("The transactions removal process can only be executed within a db txn"))};
 
    // Check for transaction existence and remove entries from disk
    std::vector<decltype(mapWallet)::const_iterator> erased_txs;
    bilingual_str str_err;
    for (const Txid& hash : txs_to_remove) {
        auto it_wtx = mapWallet.find(hash);
        if (it_wtx == mapWallet.end()) {
            return util::Error{strprintf(_("Transaction %s does not belong to this wallet"), hash.GetHex())};
        }
        if (!batch.EraseTx(hash)) {
            return util::Error{strprintf(_("Failure removing transaction: %s"), hash.GetHex())};
        }
        erased_txs.emplace_back(it_wtx);
    }
 
    // Register callback to update the memory state only when the db txn is actually dumped to disk
    batch.RegisterTxnListener({.on_commit=[&, erased_txs]() EXCLUSIVE_LOCKS_REQUIRED(cs_wallet) {
        // Update the in-memory state and notify upper layers about the removals
        for (const auto& it : erased_txs) {
            const Txid hash{it->first};
            wtxOrdered.erase(it->second.m_it_wtxOrdered);
            for (const auto& txin : it->second.tx->vin) {
                auto range = mapTxSpends.equal_range(txin.prevout);
                for (auto iter = range.first; iter != range.second; ++iter) {
                    if (iter->second == hash) {
                        mapTxSpends.erase(iter);
                        break;
                    }
                }
            }
            for (unsigned int i = 0; i < it->second.tx->vout.size(); ++i) {
                m_txos.erase(COutPoint(hash, i));
            }
            mapWallet.erase(it);
            NotifyTransactionChanged(hash, CT_DELETED);
        }
 
        MarkDirty();
    }, .on_abort={}});
 
    return {};
}
 
bool CWallet::SetAddressBookWithDB(WalletBatch& batch, const CTxDestination& address, const std::string& strName, const std::optional<AddressPurpose>& new_purpose)
{
    bool fUpdated = false;
    bool is_mine;
    std::optional<AddressPurpose> purpose;
    {
        LOCK(cs_wallet);
        std::map<CTxDestination, CAddressBookData>::iterator mi = m_address_book.find(address);
        fUpdated = mi != m_address_book.end() && !mi->second.IsChange();
 
        CAddressBookData& record = mi != m_address_book.end() ? mi->second : m_address_book[address];
        record.SetLabel(strName);
        is_mine = IsMine(address);
        if (new_purpose) { /* update purpose only if requested */
            record.purpose = new_purpose;
        }
        purpose = record.purpose;
    }
 
    const std::string& encoded_dest = EncodeDestination(address);
    if (new_purpose && !batch.WritePurpose(encoded_dest, PurposeToString(*new_purpose))) {
        WalletLogPrintf("Error: fail to write address book 'purpose' entry\n");
        return false;
    }
    if (!batch.WriteName(encoded_dest, strName)) {
        WalletLogPrintf("Error: fail to write address book 'name' entry\n");
        return false;
    }
 
    // In very old wallets, address purpose may not be recorded so we derive it from IsMine
    NotifyAddressBookChanged(address, strName, is_mine,
                             purpose.value_or(is_mine ? AddressPurpose::RECEIVE : AddressPurpose::SEND),
                             (fUpdated ? CT_UPDATED : CT_NEW));
    return true;
}
 
bool CWallet::SetAddressBook(const CTxDestination& address, const std::string& strName, const std::optional<AddressPurpose>& purpose)
{
    WalletBatch batch(GetDatabase());
    return SetAddressBookWithDB(batch, address, strName, purpose);
}
 
bool CWallet::DelAddressBook(const CTxDestination& address)
{
    return RunWithinTxn(GetDatabase(), /*process_desc=*/"address book entry removal", [&](WalletBatch& batch){
        return DelAddressBookWithDB(batch, address);
    });
}
 
bool CWallet::DelAddressBookWithDB(WalletBatch& batch, const CTxDestination& address)
{
    const std::string& dest = EncodeDestination(address);
    {
        LOCK(cs_wallet);
        // If we want to delete receiving addresses, we should avoid calling EraseAddressData because it will delete the previously_spent value. Could instead just erase the label so it becomes a change address, and keep the data.
        // NOTE: This isn't a problem for sending addresses because they don't have any data that needs to be kept.
        // When adding new address data, it should be considered here whether to retain or delete it.
        if (IsMine(address)) {
            WalletLogPrintf("%s called with IsMine address, NOT SUPPORTED. Please report this bug! %s\n", __func__, CLIENT_BUGREPORT);
            return false;
        }
        // Delete data rows associated with this address
        if (!batch.EraseAddressData(address)) {
            WalletLogPrintf("Error: cannot erase address book entry data\n");
            return false;
        }
 
        // Delete purpose entry
        if (!batch.ErasePurpose(dest)) {
            WalletLogPrintf("Error: cannot erase address book entry purpose\n");
            return false;
        }
 
        // Delete name entry
        if (!batch.EraseName(dest)) {
            WalletLogPrintf("Error: cannot erase address book entry name\n");
            return false;
        }
 
        // finally, remove it from the map
        m_address_book.erase(address);
    }
 
    // All good, signal changes
    NotifyAddressBookChanged(address, "", /*is_mine=*/false, AddressPurpose::SEND, CT_DELETED);
    return true;
}
 
size_t CWallet::KeypoolCountExternalKeys() const
{
    AssertLockHeld(cs_wallet);
 
    unsigned int count = 0;
    for (auto spk_man : m_external_spk_managers) {
        count += spk_man.second->GetKeyPoolSize();
    }
 
    return count;
}
 
unsigned int CWallet::GetKeyPoolSize() const
{
    AssertLockHeld(cs_wallet);
 
    unsigned int count = 0;
    for (auto spk_man : GetActiveScriptPubKeyMans()) {
        count += spk_man->GetKeyPoolSize();
    }
    return count;
}
 
bool CWallet::TopUpKeyPool(unsigned int kpSize)
{
    LOCK(cs_wallet);
    bool res = true;
    for (auto spk_man : GetActiveScriptPubKeyMans()) {
        res &= spk_man->TopUp(kpSize);
    }
    return res;
}
 
util::Result<CTxDestination> CWallet::GetNewDestination(const OutputType type, const std::string& label)
{
    LOCK(cs_wallet);
    auto spk_man = GetScriptPubKeyMan(type, /*internal=*/false);
    if (!spk_man) {
        return util::Error{strprintf(_("Error: No %s addresses available."), FormatOutputType(type))};
    }
 
    auto op_dest = spk_man->GetNewDestination(type);
    if (op_dest) {
        SetAddressBook(*op_dest, label, AddressPurpose::RECEIVE);
    }
 
    return op_dest;
}
 
util::Result<CTxDestination> CWallet::GetNewChangeDestination(const OutputType type)
{
    LOCK(cs_wallet);
 
    ReserveDestination reservedest(this, type);
    auto op_dest = reservedest.GetReservedDestination(true);
    if (op_dest) reservedest.KeepDestination();
 
    return op_dest;
}
 
void CWallet::MarkDestinationsDirty(const std::set<CTxDestination>& destinations) {
    for (auto& entry : mapWallet) {
        CWalletTx& wtx = entry.second;
        if (wtx.m_is_cache_empty) continue;
        for (unsigned int i = 0; i < wtx.tx->vout.size(); i++) {
            CTxDestination dst;
            if (ExtractDestination(wtx.tx->vout[i].scriptPubKey, dst) && destinations.contains(dst)) {
                wtx.MarkDirty();
                break;
            }
        }
    }
}
 
void CWallet::ForEachAddrBookEntry(const ListAddrBookFunc& func) const
{
    AssertLockHeld(cs_wallet);
    for (const std::pair<const CTxDestination, CAddressBookData>& item : m_address_book) {
        const auto& entry = item.second;
        func(item.first, entry.GetLabel(), entry.IsChange(), entry.purpose);
    }
}
 
std::vector<CTxDestination> CWallet::ListAddrBookAddresses(const std::optional<AddrBookFilter>& _filter) const
{
    AssertLockHeld(cs_wallet);
    std::vector<CTxDestination> result;
    AddrBookFilter filter = _filter ? *_filter : AddrBookFilter();
    ForEachAddrBookEntry([&result, &filter](const CTxDestination& dest, const std::string& label, bool is_change, const std::optional<AddressPurpose>& purpose) {
        // Filter by change
        if (filter.ignore_change && is_change) return;
        // Filter by label
        if (filter.m_op_label && *filter.m_op_label != label) return;
        // All good
        result.emplace_back(dest);
    });
    return result;
}
 
std::set<std::string> CWallet::ListAddrBookLabels(const std::optional<AddressPurpose> purpose) const
{
    AssertLockHeld(cs_wallet);
    std::set<std::string> label_set;
    ForEachAddrBookEntry([&](const CTxDestination& _dest, const std::string& _label,
                             bool _is_change, const std::optional<AddressPurpose>& _purpose) {
        if (_is_change) return;
        if (!purpose || purpose == _purpose) {
            label_set.insert(_label);
        }
    });
    return label_set;
}
 
util::Result<CTxDestination> ReserveDestination::GetReservedDestination(bool internal)
{
    m_spk_man = pwallet->GetScriptPubKeyMan(type, internal);
    if (!m_spk_man) {
        return util::Error{strprintf(_("Error: No %s addresses available."), FormatOutputType(type))};
    }
 
    if (nIndex == -1) {
        int64_t index;
        auto op_address = m_spk_man->GetReservedDestination(type, internal, index);
        if (!op_address) return op_address;
        nIndex = index;
        address = *op_address;
    }
    return address;
}
 
void ReserveDestination::KeepDestination()
{
    if (nIndex != -1) {
        m_spk_man->KeepDestination(nIndex, type);
    }
    nIndex = -1;
    address = CNoDestination();
}
 
void ReserveDestination::ReturnDestination()
{
    if (nIndex != -1) {
        m_spk_man->ReturnDestination(nIndex, fInternal, address);
    }
    nIndex = -1;
    address = CNoDestination();
}
 
util::Result<void> CWallet::DisplayAddress(const CTxDestination& dest)
{
    CScript scriptPubKey = GetScriptForDestination(dest);
    for (const auto& spk_man : GetScriptPubKeyMans(scriptPubKey)) {
        auto signer_spk_man = dynamic_cast<ExternalSignerScriptPubKeyMan *>(spk_man);
        if (signer_spk_man == nullptr) {
            continue;
        }
        auto signer{ExternalSignerScriptPubKeyMan::GetExternalSigner()};
        if (!signer) throw std::runtime_error(util::ErrorString(signer).original);
        return signer_spk_man->DisplayAddress(dest, *signer);
    }
    return util::Error{_("There is no ScriptPubKeyManager for this address")};
}
 
void CWallet::LoadLockedCoin(const COutPoint& coin, bool persistent)
{
    AssertLockHeld(cs_wallet);
    m_locked_coins.emplace(coin, persistent);
}
 
bool CWallet::LockCoin(const COutPoint& output, bool persist)
{
    AssertLockHeld(cs_wallet);
    LoadLockedCoin(output, persist);
    if (persist) {
        WalletBatch batch(GetDatabase());
        return batch.WriteLockedUTXO(output);
    }
    return true;
}
 
bool CWallet::UnlockCoin(const COutPoint& output)
{
    AssertLockHeld(cs_wallet);
    auto locked_coin_it = m_locked_coins.find(output);
    if (locked_coin_it != m_locked_coins.end()) {
        bool persisted = locked_coin_it->second;
        m_locked_coins.erase(locked_coin_it);
        if (persisted) {
            WalletBatch batch(GetDatabase());
            return batch.EraseLockedUTXO(output);
        }
    }
    return true;
}
 
bool CWallet::UnlockAllCoins()
{
    AssertLockHeld(cs_wallet);
    bool success = true;
    WalletBatch batch(GetDatabase());
    for (const auto& [coin, persistent] : m_locked_coins) {
        if (persistent) success = success && batch.EraseLockedUTXO(coin);
    }
    m_locked_coins.clear();
    return success;
}
 
bool CWallet::IsLockedCoin(const COutPoint& output) const
{
    AssertLockHeld(cs_wallet);
    return m_locked_coins.contains(output);
}
 
void CWallet::ListLockedCoins(std::vector<COutPoint>& vOutpts) const
{
    AssertLockHeld(cs_wallet);
    for (const auto& [coin, _] : m_locked_coins) {
        vOutpts.push_back(coin);
    }
}
 
unsigned int CWallet::ComputeTimeSmart(const CWalletTx& wtx, bool rescanning_old_block) const
{
    std::optional<uint256> block_hash;
    if (auto* conf = wtx.state<TxStateConfirmed>()) {
        block_hash = conf->confirmed_block_hash;
    } else if (auto* conf = wtx.state<TxStateBlockConflicted>()) {
        block_hash = conf->conflicting_block_hash;
    }
 
    unsigned int nTimeSmart = wtx.nTimeReceived;
    if (block_hash) {
        int64_t blocktime;
        int64_t block_max_time;
        if (chain().findBlock(*block_hash, FoundBlock().time(blocktime).maxTime(block_max_time))) {
            if (rescanning_old_block) {
                nTimeSmart = block_max_time;
            } else {
                int64_t latestNow = wtx.nTimeReceived;
                int64_t latestEntry = 0;
 
                // Tolerate times up to the last timestamp in the wallet not more than 5 minutes into the future
                int64_t latestTolerated = latestNow + 300;
                const TxItems& txOrdered = wtxOrdered;
                for (auto it = txOrdered.rbegin(); it != txOrdered.rend(); ++it) {
                    CWalletTx* const pwtx = it->second;
                    if (pwtx == &wtx) {
                        continue;
                    }
                    int64_t nSmartTime;
                    nSmartTime = pwtx->nTimeSmart;
                    if (!nSmartTime) {
                        nSmartTime = pwtx->nTimeReceived;
                    }
                    if (nSmartTime <= latestTolerated) {
                        latestEntry = nSmartTime;
                        if (nSmartTime > latestNow) {
                            latestNow = nSmartTime;
                        }
                        break;
                    }
                }
 
                nTimeSmart = std::max(latestEntry, std::min(blocktime, latestNow));
            }
        } else {
            WalletLogPrintf("%s: found %s in block %s not in index\n", __func__, wtx.GetHash().ToString(), block_hash->ToString());
        }
    }
    return nTimeSmart;
}
 
bool CWallet::SetAddressPreviouslySpent(WalletBatch& batch, const CTxDestination& dest, bool used)
{
    if (std::get_if<CNoDestination>(&dest))
        return false;
 
    if (!used) {
        if (auto* data{common::FindKey(m_address_book, dest)}) data->previously_spent = false;
        return batch.WriteAddressPreviouslySpent(dest, false);
    }
 
    LoadAddressPreviouslySpent(dest);
    return batch.WriteAddressPreviouslySpent(dest, true);
}
 
void CWallet::LoadAddressPreviouslySpent(const CTxDestination& dest)
{
    m_address_book[dest].previously_spent = true;
}
 
void CWallet::LoadAddressReceiveRequest(const CTxDestination& dest, const std::string& id, const std::string& request)
{
    m_address_book[dest].receive_requests[id] = request;
}
 
bool CWallet::IsAddressPreviouslySpent(const CTxDestination& dest) const
{
    if (auto* data{common::FindKey(m_address_book, dest)}) return data->previously_spent;
    return false;
}
 
std::vector<std::string> CWallet::GetAddressReceiveRequests() const
{
    std::vector<std::string> values;
    for (const auto& [dest, entry] : m_address_book) {
        for (const auto& [id, request] : entry.receive_requests) {
            values.emplace_back(request);
        }
    }
    return values;
}
 
bool CWallet::SetAddressReceiveRequest(WalletBatch& batch, const CTxDestination& dest, const std::string& id, const std::string& value)
{
    if (!batch.WriteAddressReceiveRequest(dest, id, value)) return false;
    m_address_book[dest].receive_requests[id] = value;
    return true;
}
 
bool CWallet::EraseAddressReceiveRequest(WalletBatch& batch, const CTxDestination& dest, const std::string& id)
{
    if (!batch.EraseAddressReceiveRequest(dest, id)) return false;
    m_address_book[dest].receive_requests.erase(id);
    return true;
}
 
static util::Result<fs::path> GetWalletPath(const std::string& name)
{
    // Do some checking on wallet path. It should be either a:
    //
    // 1. Path where a directory can be created.
    // 2. Path to an existing directory.
    // 3. Path to a symlink to a directory.
    // 4. For backwards compatibility, the name of a data file in -walletdir.
    const fs::path wallet_path = fsbridge::AbsPathJoin(GetWalletDir(), fs::PathFromString(name));
    fs::file_type path_type = fs::symlink_status(wallet_path).type();
    if (!(path_type == fs::file_type::not_found || path_type == fs::file_type::directory ||
          (path_type == fs::file_type::symlink && fs::is_directory(wallet_path)) ||
          (path_type == fs::file_type::regular && fs::PathFromString(name).filename() == fs::PathFromString(name)))) {
        return util::Error{Untranslated(strprintf(
              "Invalid -wallet path '%s'. -wallet path should point to a directory where wallet.dat and "
              "database/log.?????????? files can be stored, a location where such a directory could be created, "
              "or (for backwards compatibility) the name of an existing data file in -walletdir (%s)",
              name, fs::quoted(fs::PathToString(GetWalletDir()))))};
    }
    return wallet_path;
}
 
std::unique_ptr<WalletDatabase> MakeWalletDatabase(const std::string& name, const DatabaseOptions& options, DatabaseStatus& status, bilingual_str& error_string)
{
    const auto& wallet_path = GetWalletPath(name);
    if (!wallet_path) {
        error_string = util::ErrorString(wallet_path);
        status = DatabaseStatus::FAILED_BAD_PATH;
        return nullptr;
    }
    return MakeDatabase(*wallet_path, options, status, error_string);
}
 
bool CWallet::LoadWalletArgs(std::shared_ptr<CWallet> wallet, const WalletContext& context, bilingual_str& error, std::vector<bilingual_str>& warnings)
{
    interfaces::Chain* chain = context.chain;
    const ArgsManager& args = *Assert(context.args);
 
    if (!args.GetArg("-addresstype", "").empty()) {
        std::optional<OutputType> parsed = ParseOutputType(args.GetArg("-addresstype", ""));
        if (!parsed) {
            error = strprintf(_("Unknown address type '%s'"), args.GetArg("-addresstype", ""));
            return false;
        }
        wallet->m_default_address_type = parsed.value();
    }
 
    if (!args.GetArg("-changetype", "").empty()) {
        std::optional<OutputType> parsed = ParseOutputType(args.GetArg("-changetype", ""));
        if (!parsed) {
            error = strprintf(_("Unknown change type '%s'"), args.GetArg("-changetype", ""));
            return false;
        }
        wallet->m_default_change_type = parsed.value();
    }
 
    if (const auto arg{args.GetArg("-mintxfee")}) {
        std::optional<CAmount> min_tx_fee = ParseMoney(*arg);
        if (!min_tx_fee) {
            error = AmountErrMsg("mintxfee", *arg);
            return false;
        } else if (min_tx_fee.value() > HIGH_TX_FEE_PER_KB) {
            warnings.push_back(AmountHighWarn("-mintxfee") + Untranslated(" ") +
                               _("This is the minimum transaction fee you pay on every transaction."));
        }
 
        wallet->m_min_fee = CFeeRate{min_tx_fee.value()};
    }
 
    if (const auto arg{args.GetArg("-maxapsfee")}) {
        const std::string& max_aps_fee{*arg};
        if (max_aps_fee == "-1") {
            wallet->m_max_aps_fee = -1;
        } else if (std::optional<CAmount> max_fee = ParseMoney(max_aps_fee)) {
            if (max_fee.value() > HIGH_APS_FEE) {
                warnings.push_back(AmountHighWarn("-maxapsfee") + Untranslated(" ") +
                                  _("This is the maximum transaction fee you pay (in addition to the normal fee) to prioritize partial spend avoidance over regular coin selection."));
            }
            wallet->m_max_aps_fee = max_fee.value();
        } else {
            error = AmountErrMsg("maxapsfee", max_aps_fee);
            return false;
        }
    }
 
    if (const auto arg{args.GetArg("-fallbackfee")}) {
        std::optional<CAmount> fallback_fee = ParseMoney(*arg);
        if (!fallback_fee) {
            error = strprintf(_("Invalid amount for %s=<amount>: '%s'"), "-fallbackfee", *arg);
            return false;
        } else if (fallback_fee.value() > HIGH_TX_FEE_PER_KB) {
            warnings.push_back(AmountHighWarn("-fallbackfee") + Untranslated(" ") +
                               _("This is the transaction fee you may pay when fee estimates are not available."));
        }
        wallet->m_fallback_fee = CFeeRate{fallback_fee.value()};
    }
 
    // Disable fallback fee in case value was set to 0, enable if non-null value
    wallet->m_allow_fallback_fee = wallet->m_fallback_fee.GetFeePerK() != 0;
 
    if (const auto arg{args.GetArg("-discardfee")}) {
        std::optional<CAmount> discard_fee = ParseMoney(*arg);
        if (!discard_fee) {
            error = strprintf(_("Invalid amount for %s=<amount>: '%s'"), "-discardfee", *arg);
            return false;
        } else if (discard_fee.value() > HIGH_TX_FEE_PER_KB) {
            warnings.push_back(AmountHighWarn("-discardfee") + Untranslated(" ") +
                               _("This is the transaction fee you may discard if change is smaller than dust at this level"));
        }
        wallet->m_discard_rate = CFeeRate{discard_fee.value()};
    }
 
    if (const auto arg{args.GetArg("-maxtxfee")}) {
        std::optional<CAmount> max_fee = ParseMoney(*arg);
        if (!max_fee) {
            error = AmountErrMsg("maxtxfee", *arg);
            return false;
        } else if (max_fee.value() > HIGH_MAX_TX_FEE) {
            warnings.push_back(strprintf(_("%s is set very high! Fees this large could be paid on a single transaction."), "-maxtxfee"));
        }
 
        if (chain && CFeeRate{max_fee.value(), 1000} < chain->relayMinFee()) {
            error = strprintf(_("Invalid amount for %s=<amount>: '%s' (must be at least the minrelay fee of %s to prevent stuck transactions)"),
                "-maxtxfee", *arg, chain->relayMinFee().ToString());
            return false;
        }
 
        wallet->m_default_max_tx_fee = max_fee.value();
    }
 
    if (const auto arg{args.GetArg("-consolidatefeerate")}) {
        if (std::optional<CAmount> consolidate_feerate = ParseMoney(*arg)) {
            wallet->m_consolidate_feerate = CFeeRate(*consolidate_feerate);
        } else {
            error = AmountErrMsg("consolidatefeerate", *arg);
            return false;
        }
    }
 
    if (chain && chain->relayMinFee().GetFeePerK() > HIGH_TX_FEE_PER_KB) {
        warnings.push_back(AmountHighWarn("-minrelaytxfee") + Untranslated(" ") +
                           _("The wallet will avoid paying less than the minimum relay fee."));
    }
 
    wallet->m_confirm_target = args.GetIntArg("-txconfirmtarget", DEFAULT_TX_CONFIRM_TARGET);
    wallet->m_spend_zero_conf_change = args.GetBoolArg("-spendzeroconfchange", DEFAULT_SPEND_ZEROCONF_CHANGE);
    wallet->m_signal_rbf = args.GetBoolArg("-walletrbf", DEFAULT_WALLET_RBF);
 
    wallet->m_keypool_size = std::max(args.GetIntArg("-keypool", DEFAULT_KEYPOOL_SIZE), int64_t{1});
    wallet->m_notify_tx_changed_script = args.GetArg("-walletnotify", "");
    wallet->SetBroadcastTransactions(args.GetBoolArg("-walletbroadcast", DEFAULT_WALLETBROADCAST));
 
    return true;
}
 
std::shared_ptr<CWallet> CWallet::CreateNew(WalletContext& context, const std::string& name, std::unique_ptr<WalletDatabase> database, uint64_t wallet_creation_flags, bilingual_str& error, std::vector<bilingual_str>& warnings)
{
    interfaces::Chain* chain = context.chain;
    const std::string& walletFile = database->Filename();
 
    const auto start{SteadyClock::now()};
    // TODO: Can't use std::make_shared because we need a custom deleter but
    // should be possible to use std::allocate_shared.
    std::shared_ptr<CWallet> walletInstance(new CWallet(chain, name, std::move(database)), FlushAndDeleteWallet);
 
    if (!LoadWalletArgs(walletInstance, context, error, warnings)) {
        return nullptr;
    }
 
    // Initialize version key.
    if(!WalletBatch(walletInstance->GetDatabase()).WriteVersion(CLIENT_VERSION)) {
        error = strprintf(_("Error creating %s: Could not write version metadata."), walletFile);
        return nullptr;
    }
    {
        LOCK(walletInstance->cs_wallet);
 
        // Init with passed flags.
        // Always set the cache upgrade flag as this feature is supported from the beginning.
        walletInstance->InitWalletFlags(wallet_creation_flags | WALLET_FLAG_LAST_HARDENED_XPUB_CACHED);
 
        // Only descriptor wallets can be created
        assert(walletInstance->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
 
        if ((wallet_creation_flags & WALLET_FLAG_EXTERNAL_SIGNER) || !(wallet_creation_flags & (WALLET_FLAG_DISABLE_PRIVATE_KEYS | WALLET_FLAG_BLANK_WALLET))) {
            walletInstance->SetupDescriptorScriptPubKeyMans();
        }
 
        if (chain) {
            std::optional<int> tip_height = chain->getHeight();
            if (tip_height) {
                walletInstance->SetLastBlockProcessed(*tip_height, chain->getBlockHash(*tip_height));
            }
        }
    }
 
    walletInstance->WalletLogPrintf("Wallet completed creation in %15dms\n", Ticks<std::chrono::milliseconds>(SteadyClock::now() - start));
 
    // Try to top up keypool. No-op if the wallet is locked.
    walletInstance->TopUpKeyPool();
 
    if (chain && !AttachChain(walletInstance, *chain, /*rescan_required=*/false, error, warnings)) {
        walletInstance->DisconnectChainNotifications();
        return nullptr;
    }
 
    return walletInstance;
}
 
std::shared_ptr<CWallet> CWallet::LoadExisting(WalletContext& context, const std::string& name, std::unique_ptr<WalletDatabase> database, bilingual_str& error, std::vector<bilingual_str>& warnings)
{
    interfaces::Chain* chain = context.chain;
    const std::string& walletFile = database->Filename();
 
    const auto start{SteadyClock::now()};
    std::shared_ptr<CWallet> walletInstance(new CWallet(chain, name, std::move(database)), FlushAndDeleteWallet);
 
    if (!LoadWalletArgs(walletInstance, context, error, warnings)) {
        return nullptr;
    }
 
    // Load wallet
    auto nLoadWalletRet = walletInstance->PopulateWalletFromDB(error, warnings);
    bool rescan_required = nLoadWalletRet == DBErrors::NEED_RESCAN;
    if (nLoadWalletRet != DBErrors::LOAD_OK && nLoadWalletRet != DBErrors::NONCRITICAL_ERROR && !rescan_required) {
        return nullptr;
    }
 
    if (walletInstance->IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
        for (auto spk_man : walletInstance->GetActiveScriptPubKeyMans()) {
            if (spk_man->HavePrivateKeys()) {
                warnings.push_back(strprintf(_("Warning: Private keys detected in wallet {%s} with disabled private keys"), walletFile));
                break;
            }
        }
    }
 
    walletInstance->WalletLogPrintf("Wallet completed loading in %15dms\n", Ticks<std::chrono::milliseconds>(SteadyClock::now() - start));
 
    // Try to top up keypool. No-op if the wallet is locked.
    walletInstance->TopUpKeyPool();
 
    if (chain && !AttachChain(walletInstance, *chain, rescan_required, error, warnings)) {
        walletInstance->DisconnectChainNotifications();
        return nullptr;
    }
 
    WITH_LOCK(walletInstance->cs_wallet, walletInstance->LogStats());
 
    return walletInstance;
}
 
 
bool CWallet::AttachChain(const std::shared_ptr<CWallet>& walletInstance, interfaces::Chain& chain, const bool rescan_required, bilingual_str& error, std::vector<bilingual_str>& warnings)
{
    LOCK(walletInstance->cs_wallet);
    // allow setting the chain if it hasn't been set already but prevent changing it
    assert(!walletInstance->m_chain || walletInstance->m_chain == &chain);
    walletInstance->m_chain = &chain;
 
    // Unless allowed, ensure wallet files are not reused across chains:
    if (!gArgs.GetBoolArg("-walletcrosschain", DEFAULT_WALLETCROSSCHAIN)) {
        WalletBatch batch(walletInstance->GetDatabase());
        CBlockLocator locator;
        if (batch.ReadBestBlock(locator) && locator.vHave.size() > 0 && chain.getHeight()) {
            // Wallet is assumed to be from another chain, if genesis block in the active
            // chain differs from the genesis block known to the wallet.
            if (chain.getBlockHash(0) != locator.vHave.back()) {
                error = Untranslated("Wallet files should not be reused across chains. Restart bitcoind with -walletcrosschain to override.");
                return false;
            }
        }
    }
 
    // Register wallet with validationinterface. It's done before rescan to avoid
    // missing block connections during the rescan.
    // Because of the wallet lock being held, block connection notifications are going to
    // be pending on the validation-side until lock release. Blocks that are connected while the
    // rescan is ongoing will not be processed in the rescan but with the block connected notifications,
    // so the wallet will only be completeley synced after the notifications delivery.
    walletInstance->m_chain_notifications_handler = walletInstance->chain().handleNotifications(walletInstance);
 
    // If rescan_required = true, rescan_height remains equal to 0
    int rescan_height = 0;
    if (!rescan_required)
    {
        WalletBatch batch(walletInstance->GetDatabase());
        CBlockLocator locator;
        if (batch.ReadBestBlock(locator)) {
            if (const std::optional<int> fork_height = chain.findLocatorFork(locator)) {
                rescan_height = *fork_height;
            }
        }
    }
 
    const std::optional<int> tip_height = chain.getHeight();
    if (tip_height) {
        walletInstance->SetLastBlockProcessedInMem(*tip_height, chain.getBlockHash(*tip_height));
    } else {
        walletInstance->SetLastBlockProcessedInMem(-1, uint256());
    }
 
    if (tip_height && *tip_height != rescan_height)
    {
        // No need to read and scan block if block was created before
        // our wallet birthday (as adjusted for block time variability)
        std::optional<int64_t> time_first_key = walletInstance->m_birth_time.load();
        if (time_first_key) {
            FoundBlock found = FoundBlock().height(rescan_height);
            chain.findFirstBlockWithTimeAndHeight(*time_first_key - TIMESTAMP_WINDOW, rescan_height, found);
            if (!found.found) {
                // We were unable to find a block that had a time more recent than our earliest timestamp
                // or a height higher than the wallet was synced to, indicating that the wallet is newer than the
                // current chain tip. Skip rescanning in this case.
                rescan_height = *tip_height;
            }
        }
 
        // Technically we could execute the code below in any case, but performing the
        // `while` loop below can make startup very slow, so only check blocks on disk
        // if necessary.
        if (chain.havePruned() || chain.hasAssumedValidChain()) {
            int block_height = *tip_height;
            while (block_height > 0 && chain.haveBlockOnDisk(block_height - 1) && rescan_height != block_height) {
                --block_height;
            }
 
            if (rescan_height != block_height) {
                // We can't rescan beyond blocks we don't have data for, stop and throw an error.
                // This might happen if a user uses an old wallet within a pruned node
                // or if they ran -disablewallet for a longer time, then decided to re-enable
                // Exit early and print an error.
                // It also may happen if an assumed-valid chain is in use and therefore not
                // all block data is available.
                // If a block is pruned after this check, we will load the wallet,
                // but fail the rescan with a generic error.
 
                error = chain.havePruned() ?
                     _("Prune: last wallet synchronisation goes beyond pruned data. You need to -reindex (download the whole blockchain again in case of a pruned node)") :
                     strprintf(_(
                        "Error loading wallet. Wallet requires blocks to be downloaded, "
                        "and software does not currently support loading wallets while "
                        "blocks are being downloaded out of order when using assumeutxo "
                        "snapshots. Wallet should be able to load successfully after "
                        "node sync reaches height %s"), block_height);
                return false;
            }
        }
 
        chain.initMessage(_("Rescanning…"));
        walletInstance->WalletLogPrintf("Rescanning last %i blocks (from block %i)...\n", *tip_height - rescan_height, rescan_height);
 
        {
            WalletRescanReserver reserver(*walletInstance);
            if (!reserver.reserve()) {
                error = _("Failed to acquire rescan reserver during wallet initialization");
                return false;
            }
            ScanResult scan_res = walletInstance->ScanForWalletTransactions(chain.getBlockHash(rescan_height), rescan_height, /*max_height=*/{}, reserver, /*fUpdate=*/true, /*save_progress=*/true);
            if (ScanResult::SUCCESS != scan_res.status) {
                error = _("Failed to rescan the wallet during initialization");
                return false;
            }
            // Set and update the best block record
            // Set last block scanned as the last block processed as it may be different in case of a reorg.
            // Also save the best block locator because rescanning only updates it intermittently.
            walletInstance->SetLastBlockProcessed(*scan_res.last_scanned_height, scan_res.last_scanned_block);
        }
    }
 
    return true;
}
 
const CAddressBookData* CWallet::FindAddressBookEntry(const CTxDestination& dest, bool allow_change) const
{
    const auto& address_book_it = m_address_book.find(dest);
    if (address_book_it == m_address_book.end()) return nullptr;
    if ((!allow_change) && address_book_it->second.IsChange()) {
        return nullptr;
    }
    return &address_book_it->second;
}
 
void CWallet::postInitProcess()
{
    // Add wallet transactions that aren't already in a block to mempool
    // Do this here as mempool requires genesis block to be loaded
    ResubmitWalletTransactions(node::TxBroadcast::MEMPOOL_NO_BROADCAST, /*force=*/true);
 
    // Update wallet transactions with current mempool transactions.
    WITH_LOCK(cs_wallet, chain().requestMempoolTransactions(*this));
}
 
bool CWallet::BackupWallet(const std::string& strDest) const
{
    WITH_LOCK(cs_wallet, WriteBestBlock());
    return GetDatabase().Backup(strDest);
}
 
int CWallet::GetTxDepthInMainChain(const CWalletTx& wtx) const
{
    AssertLockHeld(cs_wallet);
    if (auto* conf = wtx.state<TxStateConfirmed>()) {
        assert(conf->confirmed_block_height >= 0);
        return GetLastBlockHeight() - conf->confirmed_block_height + 1;
    } else if (auto* conf = wtx.state<TxStateBlockConflicted>()) {
        assert(conf->conflicting_block_height >= 0);
        return -1 * (GetLastBlockHeight() - conf->conflicting_block_height + 1);
    } else {
        return 0;
    }
}
 
int CWallet::GetTxBlocksToMaturity(const CWalletTx& wtx) const
{
    AssertLockHeld(cs_wallet);
 
    if (!wtx.IsCoinBase()) {
        return 0;
    }
    int chain_depth = GetTxDepthInMainChain(wtx);
    assert(chain_depth >= 0); // coinbase tx should not be conflicted
    return std::max(0, (COINBASE_MATURITY+1) - chain_depth);
}
 
bool CWallet::IsTxImmatureCoinBase(const CWalletTx& wtx) const
{
    AssertLockHeld(cs_wallet);
 
    // note GetBlocksToMaturity is 0 for non-coinbase tx
    return GetTxBlocksToMaturity(wtx) > 0;
}
 
bool CWallet::IsLocked() const
{
    if (!HasEncryptionKeys()) {
        return false;
    }
    LOCK(cs_wallet);
    return vMasterKey.empty();
}
 
bool CWallet::Lock()
{
    if (!HasEncryptionKeys())
        return false;
 
    {
        LOCK2(m_relock_mutex, cs_wallet);
        if (!vMasterKey.empty()) {
            memory_cleanse(vMasterKey.data(), vMasterKey.size() * sizeof(decltype(vMasterKey)::value_type));
            vMasterKey.clear();
        }
    }
 
    NotifyStatusChanged(this);
    return true;
}
 
bool CWallet::Unlock(const CKeyingMaterial& vMasterKeyIn)
{
    {
        LOCK(cs_wallet);
        for (const auto& spk_man_pair : m_spk_managers) {
            if (!spk_man_pair.second->CheckDecryptionKey(vMasterKeyIn)) {
                return false;
            }
        }
        vMasterKey = vMasterKeyIn;
    }
    NotifyStatusChanged(this);
    return true;
}
 
std::set<ScriptPubKeyMan*> CWallet::GetActiveScriptPubKeyMans() const
{
    std::set<ScriptPubKeyMan*> spk_mans;
    for (bool internal : {false, true}) {
        for (OutputType t : OUTPUT_TYPES) {
            auto spk_man = GetScriptPubKeyMan(t, internal);
            if (spk_man) {
                spk_mans.insert(spk_man);
            }
        }
    }
    return spk_mans;
}
 
bool CWallet::IsActiveScriptPubKeyMan(const ScriptPubKeyMan& spkm) const
{
    for (const auto& [_, ext_spkm] : m_external_spk_managers) {
        if (ext_spkm == &spkm) return true;
    }
    for (const auto& [_, int_spkm] : m_internal_spk_managers) {
        if (int_spkm == &spkm) return true;
    }
    return false;
}
 
std::set<ScriptPubKeyMan*> CWallet::GetAllScriptPubKeyMans() const
{
    std::set<ScriptPubKeyMan*> spk_mans;
    for (const auto& spk_man_pair : m_spk_managers) {
        spk_mans.insert(spk_man_pair.second.get());
    }
    return spk_mans;
}
 
ScriptPubKeyMan* CWallet::GetScriptPubKeyMan(const OutputType& type, bool internal) const
{
    const std::map<OutputType, ScriptPubKeyMan*>& spk_managers = internal ? m_internal_spk_managers : m_external_spk_managers;
    std::map<OutputType, ScriptPubKeyMan*>::const_iterator it = spk_managers.find(type);
    if (it == spk_managers.end()) {
        return nullptr;
    }
    return it->second;
}
 
std::set<ScriptPubKeyMan*> CWallet::GetScriptPubKeyMans(const CScript& script) const
{
    std::set<ScriptPubKeyMan*> spk_mans;
 
    // Search the cache for relevant SPKMs instead of iterating m_spk_managers
    const auto& it = m_cached_spks.find(script);
    if (it != m_cached_spks.end()) {
        spk_mans.insert(it->second.begin(), it->second.end());
    }
    SignatureData sigdata;
    Assume(std::all_of(spk_mans.begin(), spk_mans.end(), [&script, &sigdata](ScriptPubKeyMan* spkm) { return spkm->CanProvide(script, sigdata); }));
 
    return spk_mans;
}
 
ScriptPubKeyMan* CWallet::GetScriptPubKeyMan(const uint256& id) const
{
    if (m_spk_managers.contains(id)) {
        return m_spk_managers.at(id).get();
    }
    return nullptr;
}
 
std::unique_ptr<SigningProvider> CWallet::GetSolvingProvider(const CScript& script) const
{
    SignatureData sigdata;
    return GetSolvingProvider(script, sigdata);
}
 
std::unique_ptr<SigningProvider> CWallet::GetSolvingProvider(const CScript& script, SignatureData& sigdata) const
{
    // Search the cache for relevant SPKMs instead of iterating m_spk_managers
    const auto& it = m_cached_spks.find(script);
    if (it != m_cached_spks.end()) {
        // All spkms for a given script must already be able to make a SigningProvider for the script, so just return the first one.
        Assume(it->second.at(0)->CanProvide(script, sigdata));
        return it->second.at(0)->GetSolvingProvider(script);
    }
 
    return nullptr;
}
 
std::vector<WalletDescriptor> CWallet::GetWalletDescriptors(const CScript& script) const
{
    std::vector<WalletDescriptor> descs;
    for (const auto spk_man: GetScriptPubKeyMans(script)) {
        if (const auto desc_spk_man = dynamic_cast<DescriptorScriptPubKeyMan*>(spk_man)) {
            LOCK(desc_spk_man->cs_desc_man);
            descs.push_back(desc_spk_man->GetWalletDescriptor());
        }
    }
    return descs;
}
 
LegacyDataSPKM* CWallet::GetLegacyDataSPKM() const
{
    if (IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
        return nullptr;
    }
    auto it = m_internal_spk_managers.find(OutputType::LEGACY);
    if (it == m_internal_spk_managers.end()) return nullptr;
    return dynamic_cast<LegacyDataSPKM*>(it->second);
}
 
void CWallet::AddScriptPubKeyMan(const uint256& id, std::unique_ptr<ScriptPubKeyMan> spkm_man)
{
    // Add spkm_man to m_spk_managers before calling any method
    // that might access it.
    const auto& spkm = m_spk_managers[id] = std::move(spkm_man);
 
    // Update birth time if needed
    MaybeUpdateBirthTime(spkm->GetTimeFirstKey());
}
 
LegacyDataSPKM* CWallet::GetOrCreateLegacyDataSPKM()
{
    SetupLegacyScriptPubKeyMan();
    return GetLegacyDataSPKM();
}
 
void CWallet::SetupLegacyScriptPubKeyMan()
{
    if (!m_internal_spk_managers.empty() || !m_external_spk_managers.empty() || !m_spk_managers.empty() || IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
        return;
    }
 
    Assert(m_database->Format() == "bdb_ro" || m_database->Format() == "mock");
    std::unique_ptr<ScriptPubKeyMan> spk_manager = std::make_unique<LegacyDataSPKM>(*this);
 
    for (const auto& type : LEGACY_OUTPUT_TYPES) {
        m_internal_spk_managers[type] = spk_manager.get();
        m_external_spk_managers[type] = spk_manager.get();
    }
    uint256 id = spk_manager->GetID();
    AddScriptPubKeyMan(id, std::move(spk_manager));
}
 
bool CWallet::WithEncryptionKey(std::function<bool (const CKeyingMaterial&)> cb) const
{
    LOCK(cs_wallet);
    return cb(vMasterKey);
}
 
bool CWallet::HasEncryptionKeys() const
{
    return !mapMasterKeys.empty();
}
 
bool CWallet::HaveCryptedKeys() const
{
    for (const auto& spkm : GetAllScriptPubKeyMans()) {
        if (spkm->HaveCryptedKeys()) return true;
    }
    return false;
}
 
void CWallet::ConnectScriptPubKeyManNotifiers()
{
    for (const auto& spk_man : GetActiveScriptPubKeyMans()) {
        spk_man->NotifyCanGetAddressesChanged.connect(NotifyCanGetAddressesChanged);
        spk_man->NotifyFirstKeyTimeChanged.connect([this](const ScriptPubKeyMan*, int64_t time) {
            MaybeUpdateBirthTime(time);
        });
    }
}
 
DescriptorScriptPubKeyMan& CWallet::LoadDescriptorScriptPubKeyMan(uint256 id, WalletDescriptor& desc)
{
    DescriptorScriptPubKeyMan* spk_manager;
    if (IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER)) {
        spk_manager = new ExternalSignerScriptPubKeyMan(*this, desc, m_keypool_size);
    } else {
        spk_manager = new DescriptorScriptPubKeyMan(*this, desc, m_keypool_size);
    }
    AddScriptPubKeyMan(id, std::unique_ptr<ScriptPubKeyMan>(spk_manager));
    return *spk_manager;
}
 
DescriptorScriptPubKeyMan& CWallet::SetupDescriptorScriptPubKeyMan(WalletBatch& batch, const CExtKey& master_key, const OutputType& output_type, bool internal)
{
    AssertLockHeld(cs_wallet);
    auto spk_manager = std::unique_ptr<DescriptorScriptPubKeyMan>(new DescriptorScriptPubKeyMan(*this, m_keypool_size));
    if (HasEncryptionKeys()) {
        if (IsLocked()) {
            throw std::runtime_error(std::string(__func__) + ": Wallet is locked, cannot setup new descriptors");
        }
        if (!spk_manager->CheckDecryptionKey(vMasterKey) && !spk_manager->Encrypt(vMasterKey, &batch)) {
            throw std::runtime_error(std::string(__func__) + ": Could not encrypt new descriptors");
        }
    }
    spk_manager->SetupDescriptorGeneration(batch, master_key, output_type, internal);
    DescriptorScriptPubKeyMan* out = spk_manager.get();
    uint256 id = spk_manager->GetID();
    AddScriptPubKeyMan(id, std::move(spk_manager));
    AddActiveScriptPubKeyManWithDb(batch, id, output_type, internal);
    return *out;
}
 
void CWallet::SetupDescriptorScriptPubKeyMans(WalletBatch& batch, const CExtKey& master_key)
{
    AssertLockHeld(cs_wallet);
    for (bool internal : {false, true}) {
        for (OutputType t : OUTPUT_TYPES) {
            SetupDescriptorScriptPubKeyMan(batch, master_key, t, internal);
        }
    }
}
 
void CWallet::SetupOwnDescriptorScriptPubKeyMans(WalletBatch& batch)
{
    AssertLockHeld(cs_wallet);
    assert(!IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER));
    // Make a seed
    CKey seed_key = GenerateRandomKey();
    CPubKey seed = seed_key.GetPubKey();
    assert(seed_key.VerifyPubKey(seed));
 
    // Get the extended key
    CExtKey master_key;
    master_key.SetSeed(seed_key);
 
    SetupDescriptorScriptPubKeyMans(batch, master_key);
}
 
void CWallet::SetupDescriptorScriptPubKeyMans()
{
    AssertLockHeld(cs_wallet);
 
    if (!IsWalletFlagSet(WALLET_FLAG_EXTERNAL_SIGNER)) {
        if (!RunWithinTxn(GetDatabase(), /*process_desc=*/"setup descriptors", [&](WalletBatch& batch) EXCLUSIVE_LOCKS_REQUIRED(cs_wallet){
            SetupOwnDescriptorScriptPubKeyMans(batch);
            return true;
        })) throw std::runtime_error("Error: cannot process db transaction for descriptors setup");
    } else {
        auto signer = ExternalSignerScriptPubKeyMan::GetExternalSigner();
        if (!signer) throw std::runtime_error(util::ErrorString(signer).original);
 
        // TODO: add account parameter
        int account = 0;
        UniValue signer_res = signer->GetDescriptors(account);
 
        if (!signer_res.isObject()) throw std::runtime_error(std::string(__func__) + ": Unexpected result");
 
        WalletBatch batch(GetDatabase());
        if (!batch.TxnBegin()) throw std::runtime_error("Error: cannot create db transaction for descriptors import");
 
        for (bool internal : {false, true}) {
            const UniValue& descriptor_vals = signer_res.find_value(internal ? "internal" : "receive");
            if (!descriptor_vals.isArray()) throw std::runtime_error(std::string(__func__) + ": Unexpected result");
            for (const UniValue& desc_val : descriptor_vals.get_array().getValues()) {
                const std::string& desc_str = desc_val.getValStr();
                FlatSigningProvider keys;
                std::string desc_error;
                auto descs = Parse(desc_str, keys, desc_error, false);
                if (descs.empty()) {
                    throw std::runtime_error(std::string(__func__) + ": Invalid descriptor \"" + desc_str + "\" (" + desc_error + ")");
                }
                auto& desc = descs.at(0);
                if (!desc->GetOutputType()) {
                    continue;
                }
                OutputType t =  *desc->GetOutputType();
                auto spk_manager = std::unique_ptr<ExternalSignerScriptPubKeyMan>(new ExternalSignerScriptPubKeyMan(*this, m_keypool_size));
                spk_manager->SetupDescriptor(batch, std::move(desc));
                uint256 id = spk_manager->GetID();
                AddScriptPubKeyMan(id, std::move(spk_manager));
                AddActiveScriptPubKeyManWithDb(batch, id, t, internal);
            }
        }
 
        // Ensure imported descriptors are committed to disk
        if (!batch.TxnCommit()) throw std::runtime_error("Error: cannot commit db transaction for descriptors import");
    }
}
 
void CWallet::AddActiveScriptPubKeyMan(uint256 id, OutputType type, bool internal)
{
    WalletBatch batch(GetDatabase());
    return AddActiveScriptPubKeyManWithDb(batch, id, type, internal);
}
 
void CWallet::AddActiveScriptPubKeyManWithDb(WalletBatch& batch, uint256 id, OutputType type, bool internal)
{
    if (!batch.WriteActiveScriptPubKeyMan(static_cast<uint8_t>(type), id, internal)) {
        throw std::runtime_error(std::string(__func__) + ": writing active ScriptPubKeyMan id failed");
    }
    LoadActiveScriptPubKeyMan(id, type, internal);
}
 
void CWallet::LoadActiveScriptPubKeyMan(uint256 id, OutputType type, bool internal)
{
    // Activating ScriptPubKeyManager for a given output and change type is incompatible with legacy wallets.
    // Legacy wallets have only one ScriptPubKeyManager and it's active for all output and change types.
    Assert(IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
 
    WalletLogPrintf("Setting spkMan to active: id = %s, type = %s, internal = %s\n", id.ToString(), FormatOutputType(type), internal ? "true" : "false");
    auto& spk_mans = internal ? m_internal_spk_managers : m_external_spk_managers;
    auto& spk_mans_other = internal ? m_external_spk_managers : m_internal_spk_managers;
    auto spk_man = m_spk_managers.at(id).get();
    spk_mans[type] = spk_man;
 
    const auto it = spk_mans_other.find(type);
    if (it != spk_mans_other.end() && it->second == spk_man) {
        spk_mans_other.erase(type);
    }
 
    NotifyCanGetAddressesChanged();
}
 
void CWallet::DeactivateScriptPubKeyMan(uint256 id, OutputType type, bool internal)
{
    auto spk_man = GetScriptPubKeyMan(type, internal);
    if (spk_man != nullptr && spk_man->GetID() == id) {
        WalletLogPrintf("Deactivate spkMan: id = %s, type = %s, internal = %s\n", id.ToString(), FormatOutputType(type), internal ? "true" : "false");
        WalletBatch batch(GetDatabase());
        if (!batch.EraseActiveScriptPubKeyMan(static_cast<uint8_t>(type), internal)) {
            throw std::runtime_error(std::string(__func__) + ": erasing active ScriptPubKeyMan id failed");
        }
 
        auto& spk_mans = internal ? m_internal_spk_managers : m_external_spk_managers;
        spk_mans.erase(type);
    }
 
    NotifyCanGetAddressesChanged();
}
 
DescriptorScriptPubKeyMan* CWallet::GetDescriptorScriptPubKeyMan(const WalletDescriptor& desc) const
{
    auto spk_man_pair = m_spk_managers.find(desc.id);
 
    if (spk_man_pair != m_spk_managers.end()) {
        // Try to downcast to DescriptorScriptPubKeyMan then check if the descriptors match
        DescriptorScriptPubKeyMan* spk_manager = dynamic_cast<DescriptorScriptPubKeyMan*>(spk_man_pair->second.get());
        if (spk_manager != nullptr && spk_manager->HasWalletDescriptor(desc)) {
            return spk_manager;
        }
    }
 
    return nullptr;
}
 
std::optional<bool> CWallet::IsInternalScriptPubKeyMan(ScriptPubKeyMan* spk_man) const
{
    // only active ScriptPubKeyMan can be internal
    if (!GetActiveScriptPubKeyMans().contains(spk_man)) {
        return std::nullopt;
    }
 
    const auto desc_spk_man = dynamic_cast<DescriptorScriptPubKeyMan*>(spk_man);
    if (!desc_spk_man) {
        throw std::runtime_error(std::string(__func__) + ": unexpected ScriptPubKeyMan type.");
    }
 
    LOCK(desc_spk_man->cs_desc_man);
    const auto& type = desc_spk_man->GetWalletDescriptor().descriptor->GetOutputType();
    assert(type.has_value());
 
    return GetScriptPubKeyMan(*type, /* internal= */ true) == desc_spk_man;
}
 
util::Result<std::reference_wrapper<DescriptorScriptPubKeyMan>> CWallet::AddWalletDescriptor(WalletDescriptor& desc, const FlatSigningProvider& signing_provider, const std::string& label, bool internal)
{
    AssertLockHeld(cs_wallet);
 
    Assert(IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
 
    auto spk_man = GetDescriptorScriptPubKeyMan(desc);
    if (spk_man) {
        WalletLogPrintf("Update existing descriptor: %s\n", desc.descriptor->ToString());
        if (auto spkm_res = spk_man->UpdateWalletDescriptor(desc); !spkm_res) {
            return util::Error{util::ErrorString(spkm_res)};
        }
    } else {
        auto new_spk_man = std::unique_ptr<DescriptorScriptPubKeyMan>(new DescriptorScriptPubKeyMan(*this, desc, m_keypool_size));
        spk_man = new_spk_man.get();
 
        // Save the descriptor to memory
        uint256 id = new_spk_man->GetID();
        AddScriptPubKeyMan(id, std::move(new_spk_man));
    }
 
    // Add the private keys to the descriptor
    for (const auto& entry : signing_provider.keys) {
        const CKey& key = entry.second;
        spk_man->AddDescriptorKey(key, key.GetPubKey());
    }
 
    // Top up key pool, the manager will generate new scriptPubKeys internally
    if (!spk_man->TopUp()) {
        return util::Error{_("Could not top up scriptPubKeys")};
    }
 
    // Apply the label if necessary
    // Note: we disable labels for ranged descriptors
    if (!desc.descriptor->IsRange()) {
        auto script_pub_keys = spk_man->GetScriptPubKeys();
        if (script_pub_keys.empty()) {
            return util::Error{_("Could not generate scriptPubKeys (cache is empty)")};
        }
 
        if (!internal) {
            for (const auto& script : script_pub_keys) {
                CTxDestination dest;
                if (ExtractDestination(script, dest)) {
                    SetAddressBook(dest, label, AddressPurpose::RECEIVE);
                }
            }
        }
    }
 
    // Save the descriptor to DB
    spk_man->WriteDescriptor();
 
    // Break balance caches so that outputs that are now IsMine in already known txs will be included in the balance
    MarkDirty();
 
    return std::reference_wrapper(*spk_man);
}
 
bool CWallet::MigrateToSQLite(bilingual_str& error)
{
    AssertLockHeld(cs_wallet);
 
    WalletLogPrintf("Migrating wallet storage database from BerkeleyDB to SQLite.\n");
 
    if (m_database->Format() == "sqlite") {
        error = _("Error: This wallet already uses SQLite");
        return false;
    }
 
    // Get all of the records for DB type migration
    std::unique_ptr<DatabaseBatch> batch = m_database->MakeBatch();
    std::unique_ptr<DatabaseCursor> cursor = batch->GetNewCursor();
    std::vector<std::pair<SerializeData, SerializeData>> records;
    if (!cursor) {
        error = _("Error: Unable to begin reading all records in the database");
        return false;
    }
    DatabaseCursor::Status status = DatabaseCursor::Status::FAIL;
    while (true) {
        DataStream ss_key{};
        DataStream ss_value{};
        status = cursor->Next(ss_key, ss_value);
        if (status != DatabaseCursor::Status::MORE) {
            break;
        }
        SerializeData key(ss_key.begin(), ss_key.end());
        SerializeData value(ss_value.begin(), ss_value.end());
        records.emplace_back(key, value);
    }
    cursor.reset();
    batch.reset();
    if (status != DatabaseCursor::Status::DONE) {
        error = _("Error: Unable to read all records in the database");
        return false;
    }
 
    // Close this database and delete the file
    fs::path db_path = fs::PathFromString(m_database->Filename());
    m_database->Close();
    fs::remove(db_path);
 
    // Generate the path for the location of the migrated wallet
    // Wallets that are plain files rather than wallet directories will be migrated to be wallet directories.
    const fs::path wallet_path = fsbridge::AbsPathJoin(GetWalletDir(), fs::PathFromString(m_name));
 
    // Make new DB
    DatabaseOptions opts;
    opts.require_create = true;
    opts.require_format = DatabaseFormat::SQLITE;
    DatabaseStatus db_status;
    std::unique_ptr<WalletDatabase> new_db = MakeDatabase(wallet_path, opts, db_status, error);
    assert(new_db); // This is to prevent doing anything further with this wallet. The original file was deleted, but a backup exists.
    m_database.reset();
    m_database = std::move(new_db);
 
    // Write existing records into the new DB
    batch = m_database->MakeBatch();
    bool began = batch->TxnBegin();
    assert(began); // This is a critical error, the new db could not be written to. The original db exists as a backup, but we should not continue execution.
    for (const auto& [key, value] : records) {
        if (!batch->Write(std::span{key}, std::span{value})) {
            batch->TxnAbort();
            m_database->Close();
            fs::remove(m_database->Filename());
            assert(false); // This is a critical error, the new db could not be written to. The original db exists as a backup, but we should not continue execution.
        }
    }
    bool committed = batch->TxnCommit();
    assert(committed); // This is a critical error, the new db could not be written to. The original db exists as a backup, but we should not continue execution.
    return true;
}
 
std::optional<MigrationData> CWallet::GetDescriptorsForLegacy(bilingual_str& error) const
{
    AssertLockHeld(cs_wallet);
 
    LegacyDataSPKM* legacy_spkm = GetLegacyDataSPKM();
    if (!Assume(legacy_spkm)) {
        // This shouldn't happen
        error = Untranslated(STR_INTERNAL_BUG("Error: Legacy wallet data missing"));
        return std::nullopt;
    }
 
    std::optional<MigrationData> res = legacy_spkm->MigrateToDescriptor();
    if (res == std::nullopt) {
        error = _("Error: Unable to produce descriptors for this legacy wallet. Make sure to provide the wallet's passphrase if it is encrypted.");
        return std::nullopt;
    }
    return res;
}
 
util::Result<void> CWallet::ApplyMigrationData(WalletBatch& local_wallet_batch, MigrationData& data)
{
    AssertLockHeld(cs_wallet);
 
    LegacyDataSPKM* legacy_spkm = GetLegacyDataSPKM();
    if (!Assume(legacy_spkm)) {
        // This shouldn't happen
        return util::Error{Untranslated(STR_INTERNAL_BUG("Error: Legacy wallet data missing"))};
    }
 
    // Note: when the legacy wallet has no spendable scripts, it must be empty at the end of the process.
    bool has_spendable_material = !data.desc_spkms.empty() || data.master_key.key.IsValid();
 
    // Get all invalid or non-watched scripts that will not be migrated
    std::set<CTxDestination> not_migrated_dests;
    for (const auto& script : legacy_spkm->GetNotMineScriptPubKeys()) {
        CTxDestination dest;
        if (ExtractDestination(script, dest)) not_migrated_dests.emplace(dest);
    }
 
    // When the legacy wallet has no spendable scripts, the main wallet will be empty, leaving its script cache empty as well.
    // The watch-only and/or solvable wallet(s) will contain the scripts in their respective caches.
    if (!data.desc_spkms.empty()) Assume(!m_cached_spks.empty());
    if (!data.watch_descs.empty()) Assume(!data.watchonly_wallet->m_cached_spks.empty());
    if (!data.solvable_descs.empty()) Assume(!data.solvable_wallet->m_cached_spks.empty());
 
    for (auto& desc_spkm : data.desc_spkms) {
        if (m_spk_managers.contains(desc_spkm->GetID())) {
            return util::Error{_("Error: Duplicate descriptors created during migration. Your wallet may be corrupted.")};
        }
        uint256 id = desc_spkm->GetID();
        AddScriptPubKeyMan(id, std::move(desc_spkm));
    }
 
    // Remove the LegacyScriptPubKeyMan from disk
    if (!legacy_spkm->DeleteRecordsWithDB(local_wallet_batch)) {
        return util::Error{_("Error: cannot remove legacy wallet records")};
    }
 
    // Remove the LegacyScriptPubKeyMan from memory
    m_spk_managers.erase(legacy_spkm->GetID());
    m_external_spk_managers.clear();
    m_internal_spk_managers.clear();
 
    // Setup new descriptors (only if we are migrating any key material)
    SetWalletFlagWithDB(local_wallet_batch, WALLET_FLAG_DESCRIPTORS | WALLET_FLAG_LAST_HARDENED_XPUB_CACHED);
    if (has_spendable_material && !IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS)) {
        // Use the existing master key if we have it
        if (data.master_key.key.IsValid()) {
            SetupDescriptorScriptPubKeyMans(local_wallet_batch, data.master_key);
        } else {
            // Setup with a new seed if we don't.
            SetupOwnDescriptorScriptPubKeyMans(local_wallet_batch);
        }
    }
 
    // Get best block locator so that we can copy it to the watchonly and solvables
    CBlockLocator best_block_locator;
    if (!local_wallet_batch.ReadBestBlock(best_block_locator)) {
        return util::Error{_("Error: Unable to read wallet's best block locator record")};
    }
 
    // Update m_txos to match the descriptors remaining in this wallet
    m_txos.clear();
    RefreshAllTXOs();
 
    // Check if the transactions in the wallet are still ours. Either they belong here, or they belong in the watchonly wallet.
    // We need to go through these in the tx insertion order so that lookups to spends works.
    std::vector<Txid> txids_to_delete;
    std::unique_ptr<WalletBatch> watchonly_batch;
    if (data.watchonly_wallet) {
        watchonly_batch = std::make_unique<WalletBatch>(data.watchonly_wallet->GetDatabase());
        if (!watchonly_batch->TxnBegin()) return util::Error{strprintf(_("Error: database transaction cannot be executed for wallet %s"), data.watchonly_wallet->GetName())};
        // Copy the next tx order pos to the watchonly wallet
        LOCK(data.watchonly_wallet->cs_wallet);
        data.watchonly_wallet->nOrderPosNext = nOrderPosNext;
        watchonly_batch->WriteOrderPosNext(data.watchonly_wallet->nOrderPosNext);
        // Write the best block locator to avoid rescanning on reload
        if (!watchonly_batch->WriteBestBlock(best_block_locator)) {
            return util::Error{_("Error: Unable to write watchonly wallet best block locator record")};
        }
    }
    std::unique_ptr<WalletBatch> solvables_batch;
    if (data.solvable_wallet) {
        solvables_batch = std::make_unique<WalletBatch>(data.solvable_wallet->GetDatabase());
        if (!solvables_batch->TxnBegin()) return util::Error{strprintf(_("Error: database transaction cannot be executed for wallet %s"), data.solvable_wallet->GetName())};
        // Write the best block locator to avoid rescanning on reload
        if (!solvables_batch->WriteBestBlock(best_block_locator)) {
            return util::Error{_("Error: Unable to write solvable wallet best block locator record")};
        }
    }
    for (const auto& [_pos, wtx] : wtxOrdered) {
        // Check it is the watchonly wallet's
        // solvable_wallet doesn't need to be checked because transactions for those scripts weren't being watched for
        bool is_mine = IsMine(*wtx->tx) || IsFromMe(*wtx->tx);
        if (data.watchonly_wallet) {
            LOCK(data.watchonly_wallet->cs_wallet);
            if (data.watchonly_wallet->IsMine(*wtx->tx) || data.watchonly_wallet->IsFromMe(*wtx->tx)) {
                // Add to watchonly wallet
                const Txid& hash = wtx->GetHash();
                const CWalletTx& to_copy_wtx = *wtx;
                if (!data.watchonly_wallet->LoadToWallet(hash, [&](CWalletTx& ins_wtx, bool new_tx) EXCLUSIVE_LOCKS_REQUIRED(data.watchonly_wallet->cs_wallet) {
                    if (!new_tx) return false;
                    ins_wtx.SetTx(to_copy_wtx.tx);
                    ins_wtx.CopyFrom(to_copy_wtx);
                    return true;
                })) {
                    return util::Error{strprintf(_("Error: Could not add watchonly tx %s to watchonly wallet"), wtx->GetHash().GetHex())};
                }
                watchonly_batch->WriteTx(data.watchonly_wallet->mapWallet.at(hash));
                // Mark as to remove from the migrated wallet only if it does not also belong to it
                if (!is_mine) {
                    txids_to_delete.push_back(hash);
                    continue;
                }
            }
        }
        if (!is_mine) {
            // Both not ours and not in the watchonly wallet
            return util::Error{strprintf(_("Error: Transaction %s in wallet cannot be identified to belong to migrated wallets"), wtx->GetHash().GetHex())};
        }
        // Rewrite the transaction so that anything that may have changed about it in memory also persists to disk
        local_wallet_batch.WriteTx(*wtx);
    }
 
    // Do the removes
    if (txids_to_delete.size() > 0) {
        if (auto res = RemoveTxs(local_wallet_batch, txids_to_delete); !res) {
            return util::Error{_("Error: Could not delete watchonly transactions. ") + util::ErrorString(res)};
        }
    }
 
    // Pair external wallets with their corresponding db handler
    std::vector<std::pair<std::shared_ptr<CWallet>, std::unique_ptr<WalletBatch>>> wallets_vec;
    if (data.watchonly_wallet) wallets_vec.emplace_back(data.watchonly_wallet, std::move(watchonly_batch));
    if (data.solvable_wallet) wallets_vec.emplace_back(data.solvable_wallet, std::move(solvables_batch));
 
    // Write address book entry to disk
    auto func_store_addr = [](WalletBatch& batch, const CTxDestination& dest, const CAddressBookData& entry) {
        auto address{EncodeDestination(dest)};
        if (entry.purpose) batch.WritePurpose(address, PurposeToString(*entry.purpose));
        if (entry.label) batch.WriteName(address, *entry.label);
        for (const auto& [id, request] : entry.receive_requests) {
            batch.WriteAddressReceiveRequest(dest, id, request);
        }
        if (entry.previously_spent) batch.WriteAddressPreviouslySpent(dest, true);
    };
 
    // Check the address book data in the same way we did for transactions
    std::vector<CTxDestination> dests_to_delete;
    for (const auto& [dest, record] : m_address_book) {
        // Ensure "receive" entries that are no longer part of the original wallet are transferred to another wallet
        // Entries for everything else ("send") will be cloned to all wallets.
        bool require_transfer = record.purpose == AddressPurpose::RECEIVE && !IsMine(dest);
        bool copied = false;
        for (auto& [wallet, batch] : wallets_vec) {
            LOCK(wallet->cs_wallet);
            if (require_transfer && !wallet->IsMine(dest)) continue;
 
            // Copy the entire address book entry
            wallet->m_address_book[dest] = record;
            func_store_addr(*batch, dest, record);
 
            copied = true;
            // Only delete 'receive' records that are no longer part of the original wallet
            if (require_transfer) {
                dests_to_delete.push_back(dest);
                break;
            }
        }
 
        // Fail immediately if we ever found an entry that was ours and cannot be transferred
        // to any of the created wallets (watch-only, solvable).
        // Means that no inferred descriptor maps to the stored entry. Which mustn't happen.
        if (require_transfer && !copied) {
 
            // Skip invalid/non-watched scripts that will not be migrated
            if (not_migrated_dests.contains(dest)) {
                dests_to_delete.push_back(dest);
                continue;
            }
 
            return util::Error{_("Error: Address book data in wallet cannot be identified to belong to migrated wallets")};
        }
    }
 
    // Persist external wallets address book entries
    for (auto& [wallet, batch] : wallets_vec) {
        if (!batch->TxnCommit()) {
            return util::Error{strprintf(_("Error: Unable to write data to disk for wallet %s"), wallet->GetName())};
        }
    }
 
    // Remove the things to delete in this wallet
    if (dests_to_delete.size() > 0) {
        for (const auto& dest : dests_to_delete) {
            if (!DelAddressBookWithDB(local_wallet_batch, dest)) {
                return util::Error{_("Error: Unable to remove watchonly address book data")};
            }
        }
    }
 
    // If there was no key material in the main wallet, there should be no records on it anymore.
    // This wallet will be discarded at the end of the process. Only wallets that contain the
    // migrated records will be presented to the user.
    if (!has_spendable_material) {
        if (!m_address_book.empty()) return util::Error{_("Error: Not all address book records were migrated")};
        if (!mapWallet.empty()) return util::Error{_("Error: Not all transaction records were migrated")};
    }
 
    return {}; // all good
}
 
bool CWallet::CanGrindR() const
{
    return !IsWalletFlagSet(WALLET_FLAG_DISABLE_PRIVATE_KEYS);
}
 
// Returns wallet prefix for migration.
// Used to name the backup file and newly created wallets.
// E.g. a watch-only wallet is named "<prefix>_watchonly".
static std::string MigrationPrefixName(CWallet& wallet)
{
    const std::string& name{wallet.GetName()};
    return name.empty() ? "default_wallet" : name;
}
 
bool DoMigration(CWallet& wallet, WalletContext& context, bilingual_str& error, MigrationResult& res) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet)
{
    AssertLockHeld(wallet.cs_wallet);
 
    // Get all of the descriptors from the legacy wallet
    std::optional<MigrationData> data = wallet.GetDescriptorsForLegacy(error);
    if (data == std::nullopt) return false;
 
    // Create the watchonly and solvable wallets if necessary
    if (data->watch_descs.size() > 0 || data->solvable_descs.size() > 0) {
        DatabaseOptions options;
        options.require_existing = false;
        options.require_create = true;
        options.require_format = DatabaseFormat::SQLITE;
 
        WalletContext empty_context;
        empty_context.args = context.args;
 
        // Make the wallets
        options.create_flags = WALLET_FLAG_DISABLE_PRIVATE_KEYS | WALLET_FLAG_BLANK_WALLET | WALLET_FLAG_DESCRIPTORS;
        if (wallet.IsWalletFlagSet(WALLET_FLAG_AVOID_REUSE)) {
            options.create_flags |= WALLET_FLAG_AVOID_REUSE;
        }
        if (wallet.IsWalletFlagSet(WALLET_FLAG_KEY_ORIGIN_METADATA)) {
            options.create_flags |= WALLET_FLAG_KEY_ORIGIN_METADATA;
        }
        if (data->watch_descs.size() > 0) {
            wallet.WalletLogPrintf("Making a new watchonly wallet containing the watched scripts\n");
 
            DatabaseStatus status;
            std::vector<bilingual_str> warnings;
            std::string wallet_name = MigrationPrefixName(wallet) + "_watchonly";
            std::unique_ptr<WalletDatabase> database = MakeWalletDatabase(wallet_name, options, status, error);
            if (!database) {
                error = strprintf(_("Wallet file creation failed: %s"), error);
                return false;
            }
 
            data->watchonly_wallet = CWallet::CreateNew(empty_context, wallet_name, std::move(database), options.create_flags, error, warnings);
            if (!data->watchonly_wallet) {
                error = _("Error: Failed to create new watchonly wallet");
                return false;
            }
            res.watchonly_wallet = data->watchonly_wallet;
            LOCK(data->watchonly_wallet->cs_wallet);
 
            // Parse the descriptors and add them to the new wallet
            for (const auto& [desc_str, creation_time] : data->watch_descs) {
                // Parse the descriptor
                FlatSigningProvider keys;
                std::string parse_err;
                std::vector<std::unique_ptr<Descriptor>> descs = Parse(desc_str, keys, parse_err, /*require_checksum=*/ true);
                assert(descs.size() == 1); // It shouldn't be possible to have the LegacyScriptPubKeyMan make an invalid descriptor or a multipath descriptors
                assert(!descs.at(0)->IsRange()); // It shouldn't be possible to have LegacyScriptPubKeyMan make a ranged watchonly descriptor
 
                // Add to the wallet
                WalletDescriptor w_desc(std::move(descs.at(0)), creation_time, 0, 0, 0);
                if (auto spkm_res = data->watchonly_wallet->AddWalletDescriptor(w_desc, keys, "", false); !spkm_res) {
                    throw std::runtime_error(util::ErrorString(spkm_res).original);
                }
            }
 
            // Add the wallet to settings
            UpdateWalletSetting(*context.chain, wallet_name, /*load_on_startup=*/true, warnings);
        }
        if (data->solvable_descs.size() > 0) {
            wallet.WalletLogPrintf("Making a new watchonly wallet containing the unwatched solvable scripts\n");
 
            DatabaseStatus status;
            std::vector<bilingual_str> warnings;
            std::string wallet_name = MigrationPrefixName(wallet) + "_solvables";
            std::unique_ptr<WalletDatabase> database = MakeWalletDatabase(wallet_name, options, status, error);
            if (!database) {
                error = strprintf(_("Wallet file creation failed: %s"), error);
                return false;
            }
 
            data->solvable_wallet = CWallet::CreateNew(empty_context, wallet_name, std::move(database), options.create_flags, error, warnings);
            if (!data->solvable_wallet) {
                error = _("Error: Failed to create new watchonly wallet");
                return false;
            }
            res.solvables_wallet = data->solvable_wallet;
            LOCK(data->solvable_wallet->cs_wallet);
 
            // Parse the descriptors and add them to the new wallet
            for (const auto& [desc_str, creation_time] : data->solvable_descs) {
                // Parse the descriptor
                FlatSigningProvider keys;
                std::string parse_err;
                std::vector<std::unique_ptr<Descriptor>> descs = Parse(desc_str, keys, parse_err, /*require_checksum=*/ true);
                assert(descs.size() == 1); // It shouldn't be possible to have the LegacyScriptPubKeyMan make an invalid descriptor or a multipath descriptors
                assert(!descs.at(0)->IsRange()); // It shouldn't be possible to have LegacyScriptPubKeyMan make a ranged watchonly descriptor
 
                // Add to the wallet
                WalletDescriptor w_desc(std::move(descs.at(0)), creation_time, 0, 0, 0);
                if (auto spkm_res = data->solvable_wallet->AddWalletDescriptor(w_desc, keys, "", false); !spkm_res) {
                    throw std::runtime_error(util::ErrorString(spkm_res).original);
                }
            }
 
            // Add the wallet to settings
            UpdateWalletSetting(*context.chain, wallet_name, /*load_on_startup=*/true, warnings);
        }
    }
 
    // Add the descriptors to wallet, remove LegacyScriptPubKeyMan, and cleanup txs and address book data
    return RunWithinTxn(wallet.GetDatabase(), /*process_desc=*/"apply migration process", [&](WalletBatch& batch) EXCLUSIVE_LOCKS_REQUIRED(wallet.cs_wallet){
        if (auto res_migration = wallet.ApplyMigrationData(batch, *data); !res_migration) {
            error = util::ErrorString(res_migration);
            return false;
        }
        wallet.WalletLogPrintf("Wallet migration complete.\n");
        return true;
    });
}
 
util::Result<MigrationResult> MigrateLegacyToDescriptor(const std::string& wallet_name, const SecureString& passphrase, WalletContext& context)
{
    std::vector<bilingual_str> warnings;
    bilingual_str error;
 
    // The only kind of wallets that could be loaded are descriptor ones, which don't need to be migrated.
    if (auto wallet = GetWallet(context, wallet_name)) {
        assert(wallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
        return util::Error{_("Error: This wallet is already a descriptor wallet")};
    } else {
        // Check if the wallet is BDB
        const auto& wallet_path = GetWalletPath(wallet_name);
        if (!wallet_path) {
            return util::Error{util::ErrorString(wallet_path)};
        }
        if (!fs::exists(*wallet_path)) {
            return util::Error{_("Error: Wallet does not exist")};
        }
        if (!IsBDBFile(BDBDataFile(*wallet_path))) {
            return util::Error{_("Error: This wallet is already a descriptor wallet")};
        }
    }
 
    // Load the wallet but only in the context of this function.
    // No signals should be connected nor should anything else be aware of this wallet
    WalletContext empty_context;
    empty_context.args = context.args;
    DatabaseOptions options;
    options.require_existing = true;
    options.require_format = DatabaseFormat::BERKELEY_RO;
    DatabaseStatus status;
    std::unique_ptr<WalletDatabase> database = MakeWalletDatabase(wallet_name, options, status, error);
    if (!database) {
        return util::Error{Untranslated("Wallet file verification failed.") + Untranslated(" ") + error};
    }
 
    // Make the local wallet
    std::shared_ptr<CWallet> local_wallet = CWallet::LoadExisting(empty_context, wallet_name, std::move(database), error, warnings);
    if (!local_wallet) {
        return util::Error{Untranslated("Wallet loading failed.") + Untranslated(" ") + error};
    }
 
    return MigrateLegacyToDescriptor(std::move(local_wallet), passphrase, context);
}
 
util::Result<MigrationResult> MigrateLegacyToDescriptor(std::shared_ptr<CWallet> local_wallet, const SecureString& passphrase, WalletContext& context)
{
    MigrationResult res;
    bilingual_str error;
    std::vector<bilingual_str> warnings;
 
    DatabaseOptions options;
    options.require_existing = true;
    DatabaseStatus status;
 
    const std::string wallet_name = local_wallet->GetName();
 
    // Before anything else, check if there is something to migrate.
    if (local_wallet->IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
        return util::Error{_("Error: This wallet is already a descriptor wallet")};
    }
 
    // Make a backup of the DB in the wallet's directory with a unique filename
    // using the wallet name and current timestamp. The backup filename is based
    // on the name of the parent directory containing the wallet data in most
    // cases, but in the case where the wallet name is a path to a data file,
    // the name of the data file is used, and in the case where the wallet name
    // is blank, "default_wallet" is used.
    const std::string backup_prefix = wallet_name.empty() ? MigrationPrefixName(*local_wallet) : [&] {
        // fs::weakly_canonical resolves relative specifiers and remove trailing slashes.
        const auto legacy_wallet_path = fs::weakly_canonical(GetWalletDir() / fs::PathFromString(wallet_name));
        return fs::PathToString(legacy_wallet_path.filename());
    }();
 
    fs::path backup_filename = fs::PathFromString(strprintf("%s_%d.legacy.bak", backup_prefix, GetTime()));
    fs::path backup_path = fsbridge::AbsPathJoin(GetWalletDir(), backup_filename);
    if (!local_wallet->BackupWallet(fs::PathToString(backup_path))) {
        return util::Error{_("Error: Unable to make a backup of your wallet")};
    }
    res.backup_path = backup_path;
 
    bool success = false;
 
    // Unlock the wallet if needed
    if (local_wallet->IsLocked() && !local_wallet->Unlock(passphrase)) {
        if (passphrase.find('\0') == std::string::npos) {
            return util::Error{Untranslated("Error: Wallet decryption failed, the wallet passphrase was not provided or was incorrect.")};
        } else {
            return util::Error{Untranslated("Error: Wallet decryption failed, the wallet passphrase entered was incorrect. "
                                            "The passphrase contains a null character (ie - a zero byte). "
                                            "If this passphrase was set with a version of this software prior to 25.0, "
                                            "please try again with only the characters up to — but not including — "
                                            "the first null character.")};
        }
    }
 
    // Indicates whether the current wallet is empty after migration.
    // Notes:
    // When non-empty: the local wallet becomes the main spendable wallet.
    // When empty: The local wallet is excluded from the result, as the
    //             user does not expect an empty spendable wallet after
    //             migrating only watch-only scripts.
    bool empty_local_wallet = false;
 
    {
        LOCK(local_wallet->cs_wallet);
        // First change to using SQLite
        if (!local_wallet->MigrateToSQLite(error)) return util::Error{error};
 
        // Do the migration of keys and scripts for non-empty wallets, and cleanup if it fails
        if (HasLegacyRecords(*local_wallet)) {
            success = DoMigration(*local_wallet, context, error, res);
            // No scripts mean empty wallet after migration
            empty_local_wallet = local_wallet->GetAllScriptPubKeyMans().empty();
        } else {
            // Make sure that descriptors flag is actually set
            local_wallet->SetWalletFlag(WALLET_FLAG_DESCRIPTORS);
            success = true;
        }
    }
 
    // In case of loading failure, we need to remember the wallet files we have created to remove.
    // A `set` is used as it may be populated with the same wallet directory paths multiple times,
    // both before and after loading. This ensures the set is complete even if one of the wallets
    // fails to load.
    std::set<fs::path> wallet_files_to_remove;
    std::set<fs::path> wallet_empty_dirs_to_remove;
 
    // Helper to track wallet files and directories for cleanup on failure.
    // Only directories of wallets created during migration (not the main wallet) are tracked.
    auto track_for_cleanup = [&](const CWallet& wallet) {
        const auto files = wallet.GetDatabase().Files();
        wallet_files_to_remove.insert(files.begin(), files.end());
        if (wallet.GetName() != wallet_name) {
            // If this isn’t the main wallet, mark its directory for removal.
            // This applies to the watch-only and solvable wallets.
            // Wallets stored directly as files in the top-level directory
            // (e.g. default unnamed wallets) don’t have a removable parent directory.
            wallet_empty_dirs_to_remove.insert(fs::PathFromString(wallet.GetDatabase().Filename()).parent_path());
        }
    };
 
 
    if (success) {
        Assume(!res.wallet); // We will set it here.
        // Check if the local wallet is empty after migration
        if (empty_local_wallet) {
            // This wallet has no records. We can safely remove it.
            std::vector<fs::path> paths_to_remove = local_wallet->GetDatabase().Files();
            local_wallet.reset();
            for (const auto& path_to_remove : paths_to_remove) fs::remove(path_to_remove);
        }
 
        LogInfo("Loading new wallets after migration...\n");
        // Migration successful, load all the migrated wallets.
        for (std::shared_ptr<CWallet>* wallet_ptr : {&local_wallet, &res.watchonly_wallet, &res.solvables_wallet}) {
            if (success && *wallet_ptr) {
                std::shared_ptr<CWallet>& wallet = *wallet_ptr;
                // Track db path and load wallet
                track_for_cleanup(*wallet);
                assert(wallet.use_count() == 1);
                std::string wallet_name = wallet->GetName();
                wallet.reset();
                wallet = LoadWallet(context, wallet_name, /*load_on_start=*/std::nullopt, options, status, error, warnings);
                if (!wallet) {
                    LogError("Failed to load wallet '%s' after migration. Rolling back migration to preserve consistency. "
                             "Error cause: %s\n", wallet_name, error.original);
                    success = false;
                    break;
                }
 
                // Set the first successfully loaded wallet as the main one.
                // The loop order is intentional and must always start with the local wallet.
                if (!res.wallet) {
                    res.wallet_name = wallet->GetName();
                    res.wallet = std::move(wallet);
                }
            }
        }
    }
    if (!success) {
        // Make list of wallets to cleanup
        std::vector<std::shared_ptr<CWallet>> created_wallets;
        if (local_wallet) created_wallets.push_back(std::move(local_wallet));
        if (res.watchonly_wallet) created_wallets.push_back(std::move(res.watchonly_wallet));
        if (res.solvables_wallet) created_wallets.push_back(std::move(res.solvables_wallet));
 
        // Get the directories to remove after unloading
        for (std::shared_ptr<CWallet>& wallet : created_wallets) {
            track_for_cleanup(*wallet);
        }
 
        // Unload the wallets
        for (std::shared_ptr<CWallet>& w : created_wallets) {
            if (w->HaveChain()) {
                // Unloading for wallets that were loaded for normal use
                if (!RemoveWallet(context, w, /*load_on_start=*/false)) {
                    error += _("\nUnable to cleanup failed migration");
                    return util::Error{error};
                }
                WaitForDeleteWallet(std::move(w));
            } else {
                // Unloading for wallets in local context
                assert(w.use_count() == 1);
                w.reset();
            }
        }
 
        // First, delete the db files we have created throughout this process and nothing else
        for (const fs::path& file : wallet_files_to_remove) {
            fs::remove(file);
        }
 
        // Second, delete the created wallet directories and nothing else. They must be empty at this point.
        for (const fs::path& dir : wallet_empty_dirs_to_remove) {
            Assume(fs::is_empty(dir));
            fs::remove(dir);
        }
 
        // Restore the backup
        // Convert the backup file to the wallet db file by renaming it and moving it into the wallet's directory.
        bilingual_str restore_error;
        const auto& ptr_wallet = RestoreWallet(context, backup_path, wallet_name, /*load_on_start=*/std::nullopt, status, restore_error, warnings, /*load_after_restore=*/false, /*allow_unnamed=*/true);
        if (!restore_error.empty()) {
            error += restore_error + _("\nUnable to restore backup of wallet.");
            return util::Error{error};
        }
        // Verify that the legacy wallet is not loaded after restoring from the backup.
        assert(!ptr_wallet);
 
        return util::Error{error};
    }
    return res;
}
 
void CWallet::CacheNewScriptPubKeys(const std::set<CScript>& spks, ScriptPubKeyMan* spkm)
{
    for (const auto& script : spks) {
        m_cached_spks[script].push_back(spkm);
    }
}
 
void CWallet::TopUpCallback(const std::set<CScript>& spks, ScriptPubKeyMan* spkm)
{
    // Update scriptPubKey cache
    CacheNewScriptPubKeys(spks, spkm);
}
 
std::set<CExtPubKey> CWallet::GetActiveHDPubKeys() const
{
    AssertLockHeld(cs_wallet);
 
    Assert(IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
 
    std::set<CExtPubKey> active_xpubs;
    for (const auto& spkm : GetActiveScriptPubKeyMans()) {
        const DescriptorScriptPubKeyMan* desc_spkm = dynamic_cast<DescriptorScriptPubKeyMan*>(spkm);
        assert(desc_spkm);
        LOCK(desc_spkm->cs_desc_man);
        WalletDescriptor w_desc = desc_spkm->GetWalletDescriptor();
 
        std::set<CPubKey> desc_pubkeys;
        std::set<CExtPubKey> desc_xpubs;
        w_desc.descriptor->GetPubKeys(desc_pubkeys, desc_xpubs);
        active_xpubs.merge(std::move(desc_xpubs));
    }
    return active_xpubs;
}
 
std::optional<CKey> CWallet::GetKey(const CKeyID& keyid) const
{
    Assert(IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS));
 
    for (const auto& spkm : GetAllScriptPubKeyMans()) {
        const DescriptorScriptPubKeyMan* desc_spkm = dynamic_cast<DescriptorScriptPubKeyMan*>(spkm);
        assert(desc_spkm);
        LOCK(desc_spkm->cs_desc_man);
        if (std::optional<CKey> key = desc_spkm->GetKey(keyid)) {
            return key;
        }
    }
    return std::nullopt;
}
 
void CWallet::WriteBestBlock() const
{
    AssertLockHeld(cs_wallet);
 
    if (!m_last_block_processed.IsNull()) {
        CBlockLocator loc;
        chain().findBlock(m_last_block_processed, FoundBlock().locator(loc));
 
        if (!loc.IsNull()) {
            WalletBatch batch(GetDatabase());
            batch.WriteBestBlock(loc);
        }
    }
}
 
void CWallet::RefreshTXOsFromTx(const CWalletTx& wtx)
{
    AssertLockHeld(cs_wallet);
    for (uint32_t i = 0; i < wtx.tx->vout.size(); ++i) {
        const CTxOut& txout = wtx.tx->vout.at(i);
        if (!IsMine(txout)) continue;
        COutPoint outpoint(wtx.GetHash(), i);
        if (m_txos.contains(outpoint)) {
        } else {
            m_txos.emplace(outpoint, WalletTXO{wtx, txout});
        }
    }
}
 
void CWallet::RefreshAllTXOs()
{
    AssertLockHeld(cs_wallet);
    for (const auto& [_, wtx] : mapWallet) {
        RefreshTXOsFromTx(wtx);
    }
}
 
std::optional<WalletTXO> CWallet::GetTXO(const COutPoint& outpoint) const
{
    AssertLockHeld(cs_wallet);
    const auto& it = m_txos.find(outpoint);
    if (it == m_txos.end()) {
        return std::nullopt;
    }
    return it->second;
}
 
void CWallet::DisconnectChainNotifications()
{
    if (m_chain_notifications_handler) {
        m_chain_notifications_handler->disconnect();
        chain().waitForNotifications();
        m_chain_notifications_handler.reset();
    }
}
 
} // namespace wallet