mempool.cpp

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// Copyright (c) 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 <rpc/blockchain.h>
 
#include <node/mempool_persist.h>
 
#include <chainparams.h>
#include <common/args.h>
#include <consensus/validation.h>
#include <core_io.h>
#include <index/txospenderindex.h>
#include <kernel/mempool_entry.h>
#include <net_processing.h>
#include <netbase.h>
#include <node/mempool_persist_args.h>
#include <node/types.h>
#include <policy/rbf.h>
#include <policy/settings.h>
#include <primitives/transaction.h>
#include <rpc/server.h>
#include <rpc/server_util.h>
#include <rpc/util.h>
#include <txmempool.h>
#include <univalue.h>
#include <util/fs.h>
#include <util/moneystr.h>
#include <util/strencodings.h>
#include <util/time.h>
#include <util/vector.h>
 
#include <map>
#include <ranges>
#include <string_view>
#include <utility>
 
using node::DumpMempool;
 
using node::DEFAULT_MAX_BURN_AMOUNT;
using node::DEFAULT_MAX_RAW_TX_FEE_RATE;
using node::MempoolPath;
using node::NodeContext;
using node::TransactionError;
using util::ToString;
 
static RPCMethod sendrawtransaction()
{
    return RPCMethod{
        "sendrawtransaction",
        "Submit a raw transaction (serialized, hex-encoded) to the network.\n"
 
        "\nIf -privatebroadcast is disabled, then the transaction will be put into the\n"
        "local mempool of the node and will be sent unconditionally to all currently\n"
        "connected peers, so using sendrawtransaction for manual rebroadcast will degrade\n"
        "privacy by leaking the transaction's origin, as nodes will normally not\n"
        "rebroadcast non-wallet transactions already in their mempool.\n"
 
        "\nIf -privatebroadcast is enabled, then the transaction will be sent only via\n"
        "dedicated, short-lived connections to Tor or I2P peers or IPv4/IPv6 peers\n"
        "via the Tor network. This conceals the transaction's origin. The transaction\n"
        "will only enter the local mempool when it is received back from the network.\n"
        "The private broadcast queue is bounded: when it is full, this RPC fails and\n"
        "the transaction is not scheduled, until an existing one completes or is\n"
        "aborted. Use getprivatebroadcastinfo to inspect the queue and abortprivatebroadcast to abort.\n"
 
        "\nA specific exception, RPC_TRANSACTION_ALREADY_IN_UTXO_SET, may throw if the transaction cannot be added to the mempool.\n"
 
        "\nRelated RPCs: createrawtransaction, signrawtransactionwithkey\n",
        {
            {"hexstring", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The hex string of the raw transaction"},
            {"maxfeerate", RPCArg::Type::AMOUNT, RPCArg::Default{FormatMoney(DEFAULT_MAX_RAW_TX_FEE_RATE.GetFeePerK())},
             "Reject transactions whose fee rate is higher than the specified value, expressed in " + CURRENCY_UNIT +
                 "/kvB.\nFee rates larger than 1BTC/kvB are rejected.\nSet to 0 to accept any fee rate."},
            {"maxburnamount", RPCArg::Type::AMOUNT, RPCArg::Default{FormatMoney(DEFAULT_MAX_BURN_AMOUNT)},
             "Reject transactions with provably unspendable outputs (e.g. 'datacarrier' outputs that use the OP_RETURN opcode) greater than the specified value, expressed in " + CURRENCY_UNIT + ".\n"
             "If burning funds through unspendable outputs is desired, increase this value.\n"
             "This check is based on heuristics and does not guarantee spendability of outputs.\n"},
        },
        RPCResult{
            RPCResult::Type::STR_HEX, "", "The transaction hash in hex"
        },
        RPCExamples{
            "\nCreate a transaction\n"
            + HelpExampleCli("createrawtransaction", "\"[{\\\"txid\\\" : \\\"mytxid\\\",\\\"vout\\\":0}]\" \"{\\\"myaddress\\\":0.01}\"") +
            "Sign the transaction, and get back the hex\n"
            + HelpExampleCli("signrawtransactionwithwallet", "\"myhex\"") +
            "\nSend the transaction (signed hex)\n"
            + HelpExampleCli("sendrawtransaction", "\"signedhex\"") +
            "\nAs a JSON-RPC call\n"
            + HelpExampleRpc("sendrawtransaction", "\"signedhex\"")
                },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
        {
            const CAmount max_burn_amount = request.params[2].isNull() ? 0 : AmountFromValue(request.params[2]);
 
            CMutableTransaction mtx;
            if (!DecodeHexTx(mtx, request.params[0].get_str())) {
                throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "TX decode failed. Make sure the tx has at least one input.");
            }
 
            for (const auto& out : mtx.vout) {
                if((out.scriptPubKey.IsUnspendable() || !out.scriptPubKey.HasValidOps()) && out.nValue > max_burn_amount) {
                    throw JSONRPCTransactionError(TransactionError::MAX_BURN_EXCEEDED);
                }
            }
 
            CTransactionRef tx(MakeTransactionRef(std::move(mtx)));
 
            const CFeeRate max_raw_tx_fee_rate{ParseFeeRate(self.Arg<UniValue>("maxfeerate"))};
 
            int64_t virtual_size = GetVirtualTransactionSize(*tx);
            CAmount max_raw_tx_fee = max_raw_tx_fee_rate.GetFee(virtual_size);
 
            std::string err_string;
            AssertLockNotHeld(cs_main);
            NodeContext& node = EnsureAnyNodeContext(request.context);
            const bool private_broadcast_enabled{gArgs.GetBoolArg("-privatebroadcast", DEFAULT_PRIVATE_BROADCAST)};
            if (private_broadcast_enabled &&
                !g_reachable_nets.Contains(NET_ONION) &&
                !g_reachable_nets.Contains(NET_I2P)) {
                throw JSONRPCError(RPC_MISC_ERROR,
                                   "-privatebroadcast is enabled, but none of the Tor or I2P networks is "
                                   "reachable. Maybe the location of the Tor proxy couldn't be retrieved "
                                   "from the Tor daemon at startup. Check whether the Tor daemon is running "
                                   "and that -torcontrol, -torpassword and -i2psam are configured properly.");
            }
            const auto method = private_broadcast_enabled ? node::TxBroadcast::NO_MEMPOOL_PRIVATE_BROADCAST
                                                          : node::TxBroadcast::MEMPOOL_AND_BROADCAST_TO_ALL;
            const TransactionError err = BroadcastTransaction(node,
                                                              tx,
                                                              err_string,
                                                              max_raw_tx_fee,
                                                              method,
                                                              /*wait_callback=*/true);
            if (TransactionError::OK != err) {
                throw JSONRPCTransactionError(err, err_string);
            }
 
            return tx->GetHash().GetHex();
        },
    };
}
 
static RPCMethod getprivatebroadcastinfo()
{
    return RPCMethod{
        "getprivatebroadcastinfo",
        "Returns information about transactions tracked for private broadcast.\n"
        "Transactions that have reached the send-attempt limit remain in the result with attempts_remaining=0.\n"
        "This method is only available when running with -privatebroadcast enabled.\n",
        {},
        RPCResult{
            RPCResult::Type::OBJ, "", "",
            {
                {RPCResult::Type::ARR, "transactions", "",
                    {
                        {RPCResult::Type::OBJ, "", "",
                            {
                                {RPCResult::Type::STR_HEX, "txid", "The transaction hash in hex"},
                                {RPCResult::Type::STR_HEX, "wtxid", "The transaction witness hash in hex"},
                                {RPCResult::Type::STR_HEX, "hex", "The serialized, hex-encoded transaction data"},
                                {RPCResult::Type::NUM_TIME, "time_added", "The time this transaction was added to the private broadcast queue (seconds since epoch)"},
                                {RPCResult::Type::NUM, "attempts_remaining", "The number of additional private broadcast send attempts allowed for this transaction"},
                                {RPCResult::Type::ARR, "peers", "Per-peer send and acknowledgment information for this transaction",
                                    {
                                        {RPCResult::Type::OBJ, "", "",
                                            {
                                                {RPCResult::Type::STR, "address", "The address of the peer to which the transaction was sent"},
                                                {RPCResult::Type::NUM_TIME, "sent", "The time this transaction was picked for sending to this peer via private broadcast (seconds since epoch)"},
                                                {RPCResult::Type::NUM_TIME, "received", /*optional=*/true, "The time this peer acknowledged reception of the transaction (seconds since epoch)"},
                                            }},
                                    }},
                            }},
                    }},
            }},
        RPCExamples{
            HelpExampleCli("getprivatebroadcastinfo", "")
            + HelpExampleRpc("getprivatebroadcastinfo", "")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
        {
            const NodeContext& node{EnsureAnyNodeContext(request.context)};
            const PeerManager& peerman{EnsurePeerman(node)};
            if (!peerman.GetInfo().private_broadcast) {
                throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Private broadcast is not enabled. Ensure you're running Bitcoin Core with -privatebroadcast=1.");
            }
 
            const auto txs{peerman.GetPrivateBroadcastInfo()};
 
            UniValue transactions(UniValue::VARR);
            for (const auto& tx_info : txs) {
                UniValue o(UniValue::VOBJ);
                o.pushKV("txid", tx_info.tx->GetHash().ToString());
                o.pushKV("wtxid", tx_info.tx->GetWitnessHash().ToString());
                o.pushKV("hex", EncodeHexTx(*tx_info.tx));
                o.pushKV("time_added", TicksSinceEpoch<std::chrono::seconds>(tx_info.time_added));
                o.pushKV("attempts_remaining", tx_info.attempts_remaining);
                UniValue peers(UniValue::VARR);
                for (const auto& peer : tx_info.peers) {
                    UniValue p(UniValue::VOBJ);
                    p.pushKV("address", peer.address.ToStringAddrPort());
                    p.pushKV("sent", TicksSinceEpoch<std::chrono::seconds>(peer.sent));
                    if (peer.received.has_value()) {
                        p.pushKV("received", TicksSinceEpoch<std::chrono::seconds>(*peer.received));
                    }
                    peers.push_back(std::move(p));
                }
                o.pushKV("peers", std::move(peers));
                transactions.push_back(std::move(o));
            }
 
            UniValue ret(UniValue::VOBJ);
            ret.pushKV("transactions", std::move(transactions));
            return ret;
        },
    };
}
 
static RPCMethod abortprivatebroadcast()
{
    return RPCMethod{
        "abortprivatebroadcast",
        "Abort private broadcast attempts for a transaction currently being privately broadcast.\n"
        "The transaction will be removed from the private broadcast queue.\n"
        "This method is only available when running with -privatebroadcast enabled.\n",
        {
            {"id", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "A transaction identifier to abort. It will be matched against both txid and wtxid for all transactions in the private broadcast queue.\n"
                                                                "If the provided id matches a txid that corresponds to multiple transactions with different wtxids, multiple transactions will be removed and returned."},
        },
        RPCResult{
            RPCResult::Type::OBJ, "", "",
            {
                {RPCResult::Type::ARR, "removed_transactions", "Transactions removed from the private broadcast queue",
                    {
                        {RPCResult::Type::OBJ, "", "",
                            {
                                {RPCResult::Type::STR_HEX, "txid", "The transaction hash in hex"},
                                {RPCResult::Type::STR_HEX, "wtxid", "The transaction witness hash in hex"},
                                {RPCResult::Type::STR_HEX, "hex", "The serialized, hex-encoded transaction data"},
                            }},
                    }},
            }
        },
        RPCExamples{
            HelpExampleCli("abortprivatebroadcast", "\"id\"")
            + HelpExampleRpc("abortprivatebroadcast", "\"id\"")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
        {
 
            const NodeContext& node{EnsureAnyNodeContext(request.context)};
            PeerManager& peerman{EnsurePeerman(node)};
            if (!peerman.GetInfo().private_broadcast) {
                throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Private broadcast is not enabled. Ensure you're running Bitcoin Core with -privatebroadcast=1.");
            }
 
            const uint256 id{ParseHashV(self.Arg<UniValue>("id"), "id")};
 
            const auto removed_txs{peerman.AbortPrivateBroadcast(id)};
            if (removed_txs.empty()) {
                throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Transaction not in private broadcast queue. Check getprivatebroadcastinfo.");
            }
 
            UniValue removed_transactions(UniValue::VARR);
            for (const auto& tx : removed_txs) {
                UniValue o(UniValue::VOBJ);
                o.pushKV("txid", tx->GetHash().ToString());
                o.pushKV("wtxid", tx->GetWitnessHash().ToString());
                o.pushKV("hex", EncodeHexTx(*tx));
                removed_transactions.push_back(std::move(o));
            }
            UniValue ret(UniValue::VOBJ);
            ret.pushKV("removed_transactions", std::move(removed_transactions));
            return ret;
        },
    };
}
 
static RPCMethod testmempoolaccept()
{
    return RPCMethod{
        "testmempoolaccept",
        "Returns result of mempool acceptance tests indicating if raw transaction(s) (serialized, hex-encoded) would be accepted by mempool.\n"
        "\nIf multiple transactions are passed in, parents must come before children and package policies apply: the transactions cannot conflict with any mempool transactions or each other.\n"
        "\nIf one transaction fails, other transactions may not be fully validated (the 'allowed' key will be blank).\n"
        "\nThe maximum number of transactions allowed is " + ToString(MAX_PACKAGE_COUNT) + ".\n"
        "\nThis checks if transactions violate the consensus or policy rules.\n"
        "\nSee sendrawtransaction call.\n",
        {
            {"rawtxs", RPCArg::Type::ARR, RPCArg::Optional::NO, "An array of hex strings of raw transactions.",
                {
                    {"rawtx", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, ""},
                },
            },
            {"maxfeerate", RPCArg::Type::AMOUNT, RPCArg::Default{FormatMoney(DEFAULT_MAX_RAW_TX_FEE_RATE.GetFeePerK())},
             "Reject transactions whose fee rate is higher than the specified value, expressed in " + CURRENCY_UNIT +
                 "/kvB.\nFee rates larger than 1BTC/kvB are rejected.\nSet to 0 to accept any fee rate."},
        },
        RPCResult{
            RPCResult::Type::ARR, "", "The result of the mempool acceptance test for each raw transaction in the input array.\n"
                                      "Returns results for each transaction in the same order they were passed in.\n"
                                      "Transactions that cannot be fully validated due to failures in other transactions will not contain an 'allowed' result.\n",
            {
                {RPCResult::Type::OBJ, "", "",
                {
                    {RPCResult::Type::STR_HEX, "txid", "The transaction hash in hex"},
                    {RPCResult::Type::STR_HEX, "wtxid", "The transaction witness hash in hex"},
                    {RPCResult::Type::STR, "package-error", /*optional=*/true, "Package validation error, if any (only possible if rawtxs had more than 1 transaction)."},
                    {RPCResult::Type::BOOL, "allowed", /*optional=*/true, "Whether this tx would be accepted to the mempool and pass client-specified maxfeerate. "
                                                       "If not present, the tx was not fully validated due to a failure in another tx in the list."},
                    {RPCResult::Type::NUM, "vsize_adjusted", /*optional=*/true, "Maximum of sigop-adjusted size (-bytespersigop) and virtual transaction size as defined in BIP 141 (only present when 'allowed' is true)."},
                    {RPCResult::Type::NUM, "vsize", /*optional=*/true, "(DEPRECATED) Was previously erroneously described as the BIP 141 vsize, but is actually sigops-adjusted vsize.\n"
                                                                "Use vsize_bip141 to actually get that behavior or switch to the explicit vsize_adjusted for retained behavior."},
                    {RPCResult::Type::NUM, "vsize_bip141", /*optional=*/true, "Virtual transaction size as defined in BIP 141.\n"
                                                                       "This is different from actual serialized size for witness transactions as witness data is discounted (only present when 'allowed' is true)."},
                    {RPCResult::Type::OBJ, "fees", /*optional=*/true, "Transaction fees (only present if 'allowed' is true)",
                    {
                        {RPCResult::Type::STR_AMOUNT, "base", "transaction fee in " + CURRENCY_UNIT},
                        {RPCResult::Type::STR_AMOUNT, "effective-feerate", /*optional=*/false, "the effective feerate in " + CURRENCY_UNIT + " per KvB. May differ from the base feerate if, for example, there are modified fees from prioritisetransaction or a package feerate was used."},
                        {RPCResult::Type::ARR, "effective-includes", /*optional=*/false, "transactions whose fees and vsizes are included in effective-feerate.",
                            {RPCResult{RPCResult::Type::STR_HEX, "", "transaction wtxid in hex"},
                        }},
                    }},
                    {RPCResult::Type::STR, "reject-reason", /*optional=*/true, "Rejection reason (only present when 'allowed' is false)"},
                    {RPCResult::Type::STR, "reject-details", /*optional=*/true, "Rejection details (only present when 'allowed' is false and rejection details exist)"},
                }},
            }
        },
        RPCExamples{
            "\nCreate a transaction\n"
            + HelpExampleCli("createrawtransaction", "\"[{\\\"txid\\\" : \\\"mytxid\\\",\\\"vout\\\":0}]\" \"{\\\"myaddress\\\":0.01}\"") +
            "Sign the transaction, and get back the hex\n"
            + HelpExampleCli("signrawtransactionwithwallet", "\"myhex\"") +
            "\nTest acceptance of the transaction (signed hex)\n"
            + HelpExampleCli("testmempoolaccept", R"('["signedhex"]')") +
            "\nAs a JSON-RPC call\n"
            + HelpExampleRpc("testmempoolaccept", "[\"signedhex\"]")
                },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
        {
            const UniValue raw_transactions = request.params[0].get_array();
            if (raw_transactions.size() < 1 || raw_transactions.size() > MAX_PACKAGE_COUNT) {
                throw JSONRPCError(RPC_INVALID_PARAMETER,
                                   "Array must contain between 1 and " + ToString(MAX_PACKAGE_COUNT) + " transactions.");
            }
 
            const CFeeRate max_raw_tx_fee_rate{ParseFeeRate(self.Arg<UniValue>("maxfeerate"))};
 
            std::vector<CTransactionRef> txns;
            txns.reserve(raw_transactions.size());
            for (const auto& rawtx : raw_transactions.getValues()) {
                CMutableTransaction mtx;
                if (!DecodeHexTx(mtx, rawtx.get_str())) {
                    throw JSONRPCError(RPC_DESERIALIZATION_ERROR,
                                       "TX decode failed: " + rawtx.get_str() + " Make sure the tx has at least one input.");
                }
                txns.emplace_back(MakeTransactionRef(std::move(mtx)));
            }
 
            NodeContext& node = EnsureAnyNodeContext(request.context);
            CTxMemPool& mempool = EnsureMemPool(node);
            ChainstateManager& chainman = EnsureChainman(node);
            Chainstate& chainstate = chainman.ActiveChainstate();
            const PackageMempoolAcceptResult package_result = [&] {
                LOCK(::cs_main);
                if (txns.size() > 1) return ProcessNewPackage(chainstate, mempool, txns, /*test_accept=*/true, /*client_maxfeerate=*/{});
                return PackageMempoolAcceptResult(txns[0]->GetWitnessHash(),
                                                  chainman.ProcessTransaction(txns[0], /*test_accept=*/true));
            }();
 
            UniValue rpc_result(UniValue::VARR);
            // We will check transaction fees while we iterate through txns in order. If any transaction fee
            // exceeds maxfeerate, we will leave the rest of the validation results blank, because it
            // doesn't make sense to return a validation result for a transaction if its ancestor(s) would
            // not be submitted.
            bool exit_early{false};
            for (const auto& tx : txns) {
                UniValue result_inner(UniValue::VOBJ);
                result_inner.pushKV("txid", tx->GetHash().GetHex());
                result_inner.pushKV("wtxid", tx->GetWitnessHash().GetHex());
                if (package_result.m_state.GetResult() == PackageValidationResult::PCKG_POLICY) {
                    result_inner.pushKV("package-error", package_result.m_state.ToString());
                }
                auto it = package_result.m_tx_results.find(tx->GetWitnessHash());
                if (exit_early || it == package_result.m_tx_results.end()) {
                    // Validation unfinished. Just return the txid and wtxid.
                    rpc_result.push_back(std::move(result_inner));
                    continue;
                }
                const auto& tx_result = it->second;
                // Package testmempoolaccept doesn't allow transactions to already be in the mempool.
                CHECK_NONFATAL(tx_result.m_result_type != MempoolAcceptResult::ResultType::MEMPOOL_ENTRY);
                if (tx_result.m_result_type == MempoolAcceptResult::ResultType::VALID) {
                    const CAmount fee = tx_result.m_base_fees.value();
                    // Check that fee does not exceed maximum fee
                    const int64_t virtual_size = tx_result.m_vsize.value();
                    const CAmount max_raw_tx_fee = max_raw_tx_fee_rate.GetFee(virtual_size);
                    if (max_raw_tx_fee && fee > max_raw_tx_fee) {
                        result_inner.pushKV("allowed", false);
                        result_inner.pushKV("reject-reason", "max-fee-exceeded");
                        exit_early = true;
                    } else {
                        // Only return the fee and vsize if the transaction would pass ATMP.
                        // These can be used to calculate the feerate.
                        result_inner.pushKV("allowed", true);
                        result_inner.pushKV("vsize_adjusted", virtual_size);
                        result_inner.pushKV("vsize", virtual_size);
                        result_inner.pushKV("vsize_bip141", GetVirtualTransactionSize(*tx));
                        UniValue fees(UniValue::VOBJ);
                        fees.pushKV("base", ValueFromAmount(fee));
                        fees.pushKV("effective-feerate", ValueFromAmount(tx_result.m_effective_feerate.value().GetFeePerK()));
                        UniValue effective_includes_res(UniValue::VARR);
                        for (const auto& wtxid : tx_result.m_wtxids_fee_calculations.value()) {
                            effective_includes_res.push_back(wtxid.ToString());
                        }
                        fees.pushKV("effective-includes", std::move(effective_includes_res));
                        result_inner.pushKV("fees", std::move(fees));
                    }
                } else {
                    result_inner.pushKV("allowed", false);
                    const TxValidationState state = tx_result.m_state;
                    if (state.GetResult() == TxValidationResult::TX_MISSING_INPUTS) {
                        result_inner.pushKV("reject-reason", "missing-inputs");
                    } else {
                        result_inner.pushKV("reject-reason", state.GetRejectReason());
                        result_inner.pushKV("reject-details", state.ToString());
                    }
                }
                rpc_result.push_back(std::move(result_inner));
            }
            return rpc_result;
        },
    };
}
 
static std::vector<RPCResult> ClusterDescription()
{
    return {
        RPCResult{RPCResult::Type::NUM, "clusterweight", "total sigops-adjusted weight (as defined in BIP 141 and modified by '-bytespersigop')"},
        RPCResult{RPCResult::Type::NUM, "txcount", "number of transactions"},
        RPCResult{RPCResult::Type::ARR, "chunks", "chunks in this cluster (in mining order)",
            {RPCResult{RPCResult::Type::OBJ, "chunk", "",
                {
                    RPCResult{RPCResult::Type::NUM, "chunkfee", "fees of the transactions in this chunk"},
                    RPCResult{RPCResult::Type::NUM, "chunkweight", "sigops-adjusted weight of all transactions in this chunk"},
                    RPCResult{RPCResult::Type::ARR, "txs", "transactions in this chunk in mining order",
                        {RPCResult{RPCResult::Type::STR_HEX, "txid", "transaction id"}}},
                }
            }}
        }
    };
}
 
static std::vector<RPCResult> MempoolEntryDescription()
{
    std::vector<RPCResult> list = {
        {RPCResult::Type::NUM, "vsize", "(DEPRECATED) Was previously erroneously described as the BIP 141 vsize, but is actually sigops-adjusted vsize.\n"
        "Use vsize_bip141 to actually get that behavior or switch to the explicit vsize_adjusted for retained behavior."},
        {RPCResult::Type::NUM, "vsize_bip141", "Virtual transaction size as defined in BIP 141.\n"
        "This is different from actual serialized size for witness transactions as witness data is discounted."},
        {RPCResult::Type::NUM, "vsize_adjusted", "Maximum of sigop-adjusted size (-bytespersigop) and virtual transaction size as defined in BIP 141."},
        RPCResult{RPCResult::Type::NUM, "weight", "transaction weight as defined in BIP 141."},
        RPCResult{RPCResult::Type::NUM_TIME, "time", "local time transaction entered pool in seconds since 1 Jan 1970 GMT"},
        RPCResult{RPCResult::Type::NUM, "height", "block height when transaction entered pool"},
        RPCResult{RPCResult::Type::NUM, "descendantcount", "number of in-mempool descendant transactions (including this one)"},
        RPCResult{RPCResult::Type::NUM, "descendantsize", "virtual transaction size of in-mempool descendants (including this one)"},
        RPCResult{RPCResult::Type::NUM, "ancestorcount", "number of in-mempool ancestor transactions (including this one)"},
        RPCResult{RPCResult::Type::NUM, "ancestorsize", "virtual transaction size of in-mempool ancestors (including this one)"},
        RPCResult{RPCResult::Type::NUM, "chunkweight", "sigops-adjusted weight (as defined in BIP 141 and modified by '-bytespersigop') of this transaction's chunk"},
        RPCResult{RPCResult::Type::STR_HEX, "wtxid", "hash of serialized transaction, including witness data"},
        RPCResult{RPCResult::Type::OBJ, "fees", "",
            {
                RPCResult{RPCResult::Type::STR_AMOUNT, "base", "transaction fee, denominated in " + CURRENCY_UNIT},
                RPCResult{RPCResult::Type::STR_AMOUNT, "modified", "transaction fee with fee deltas used for mining priority, denominated in " + CURRENCY_UNIT},
                RPCResult{RPCResult::Type::STR_AMOUNT, "ancestor", "transaction fees of in-mempool ancestors (including this one) with fee deltas used for mining priority, denominated in " + CURRENCY_UNIT},
                RPCResult{RPCResult::Type::STR_AMOUNT, "descendant", "transaction fees of in-mempool descendants (including this one) with fee deltas used for mining priority, denominated in " + CURRENCY_UNIT},
                RPCResult{RPCResult::Type::STR_AMOUNT, "chunk", "transaction fees of chunk, denominated in " + CURRENCY_UNIT},
            }},
        RPCResult{RPCResult::Type::ARR, "depends", "unconfirmed transactions used as inputs for this transaction",
            {RPCResult{RPCResult::Type::STR_HEX, "transactionid", "parent transaction id"}}},
        RPCResult{RPCResult::Type::ARR, "spentby", "unconfirmed transactions spending outputs from this transaction",
            {RPCResult{RPCResult::Type::STR_HEX, "transactionid", "child transaction id"}}},
        RPCResult{RPCResult::Type::BOOL, "unbroadcast", "Whether this transaction is currently unbroadcast (initial broadcast not yet acknowledged by any peers)"},
    };
    if (IsDeprecatedRPCEnabled("bip125")) {
        list.emplace_back(RPCResult::Type::BOOL, "bip125-replaceable", "Whether this transaction signals BIP125 replaceability or has an unconfirmed ancestor signaling BIP125 replaceability. (DEPRECATED)\n");
    }
    return list;
}
 
void AppendChunkInfo(UniValue& all_chunks, FeePerWeight chunk_feerate, std::vector<const CTxMemPoolEntry *> chunk_txs)
{
    UniValue chunk(UniValue::VOBJ);
    chunk.pushKV("chunkfee", ValueFromAmount(chunk_feerate.fee));
    chunk.pushKV("chunkweight", chunk_feerate.size);
    UniValue chunk_txids(UniValue::VARR);
    for (const auto& chunk_tx : chunk_txs) {
        chunk_txids.push_back(chunk_tx->GetTx().GetHash().ToString());
    }
    chunk.pushKV("txs", std::move(chunk_txids));
    all_chunks.push_back(std::move(chunk));
}
 
static void clusterToJSON(const CTxMemPool& pool, UniValue& info, std::vector<const CTxMemPoolEntry *> cluster) EXCLUSIVE_LOCKS_REQUIRED(pool.cs)
{
    AssertLockHeld(pool.cs);
    int total_weight{0};
    for (const auto& tx : cluster) {
        total_weight += tx->GetAdjustedWeight();
    }
    info.pushKV("clusterweight", total_weight);
    info.pushKV("txcount", cluster.size());
 
    // Output the cluster by chunk. This isn't handed to us by the mempool, but
    // we can calculate it by looking at the chunk feerates of each transaction
    // in the cluster.
    FeePerWeight current_chunk_feerate = pool.GetMainChunkFeerate(*cluster[0]);
    std::vector<const CTxMemPoolEntry *> current_chunk;
    current_chunk.reserve(cluster.size());
 
    UniValue all_chunks(UniValue::VARR);
    for (const auto& tx : cluster) {
        if (current_chunk_feerate.size == 0) {
            // We've iterated all the transactions in the previous chunk; so
            // append it to the output.
            AppendChunkInfo(all_chunks, pool.GetMainChunkFeerate(*current_chunk[0]), current_chunk);
            current_chunk.clear();
            current_chunk_feerate = pool.GetMainChunkFeerate(*tx);
        }
        current_chunk.push_back(tx);
        current_chunk_feerate.size -= tx->GetAdjustedWeight();
    }
    AppendChunkInfo(all_chunks, pool.GetMainChunkFeerate(*current_chunk[0]), current_chunk);
    current_chunk.clear();
    info.pushKV("chunks", std::move(all_chunks));
}
 
static void entryToJSON(const CTxMemPool& pool, UniValue& info, const CTxMemPoolEntry& e) EXCLUSIVE_LOCKS_REQUIRED(pool.cs)
{
    AssertLockHeld(pool.cs);
 
    auto [ancestor_count, ancestor_size, ancestor_fees] = pool.CalculateAncestorData(e);
    auto [descendant_count, descendant_size, descendant_fees] = pool.CalculateDescendantData(e);
 
    info.pushKV("vsize_adjusted", e.GetTxSize());
    info.pushKV("vsize", e.GetTxSize());
    info.pushKV("vsize_bip141", GetVirtualTransactionSize(e.GetTx()));
    info.pushKV("weight", e.GetTxWeight());
    info.pushKV("time", count_seconds(e.GetTime()));
    info.pushKV("height", e.GetHeight());
    info.pushKV("descendantcount", descendant_count);
    info.pushKV("descendantsize", descendant_size);
    info.pushKV("ancestorcount", ancestor_count);
    info.pushKV("ancestorsize", ancestor_size);
    info.pushKV("wtxid", e.GetTx().GetWitnessHash().ToString());
    auto feerate = pool.GetMainChunkFeerate(e);
    info.pushKV("chunkweight", feerate.size);
 
    UniValue fees(UniValue::VOBJ);
    fees.pushKV("base", ValueFromAmount(e.GetFee()));
    fees.pushKV("modified", ValueFromAmount(e.GetModifiedFee()));
    fees.pushKV("ancestor", ValueFromAmount(ancestor_fees));
    fees.pushKV("descendant", ValueFromAmount(descendant_fees));
    fees.pushKV("chunk", ValueFromAmount(feerate.fee));
    info.pushKV("fees", std::move(fees));
 
    const CTransaction& tx = e.GetTx();
    std::set<std::string> setDepends;
    for (const CTxIn& txin : tx.vin)
    {
        if (pool.exists(txin.prevout.hash))
            setDepends.insert(txin.prevout.hash.ToString());
    }
 
    UniValue depends(UniValue::VARR);
    for (const std::string& dep : setDepends)
    {
        depends.push_back(dep);
    }
 
    info.pushKV("depends", std::move(depends));
 
    UniValue spent(UniValue::VARR);
    for (const CTxMemPoolEntry& child : pool.GetChildren(e)) {
        spent.push_back(child.GetTx().GetHash().ToString());
    }
 
    info.pushKV("spentby", std::move(spent));
    info.pushKV("unbroadcast", pool.IsUnbroadcastTx(tx.GetHash()));
 
    // Add opt-in RBF status
    if (IsDeprecatedRPCEnabled("bip125")) {
        bool rbfStatus = false;
        RBFTransactionState rbfState = IsRBFOptIn(tx, pool);
        if (rbfState == RBFTransactionState::UNKNOWN) {
            throw JSONRPCError(RPC_MISC_ERROR, "Transaction is not in mempool");
        } else if (rbfState == RBFTransactionState::REPLACEABLE_BIP125) {
            rbfStatus = true;
        }
        info.pushKV("bip125-replaceable", rbfStatus);
    }
}
 
UniValue MempoolToJSON(const CTxMemPool& pool, bool verbose, bool include_mempool_sequence)
{
    if (verbose) {
        if (include_mempool_sequence) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Verbose results cannot contain mempool sequence values.");
        }
        LOCK(pool.cs);
        UniValue o(UniValue::VOBJ);
        for (const CTxMemPoolEntry& e : pool.entryAll()) {
            UniValue info(UniValue::VOBJ);
            entryToJSON(pool, info, e);
            // Mempool has unique entries so there is no advantage in using
            // UniValue::pushKV, which checks if the key already exists in O(N).
            // UniValue::pushKVEnd is used instead which currently is O(1).
            o.pushKVEnd(e.GetTx().GetHash().ToString(), std::move(info));
        }
        return o;
    } else {
        UniValue a(UniValue::VARR);
        uint64_t mempool_sequence;
        {
            LOCK(pool.cs);
            for (const CTxMemPoolEntry& e : pool.entryAll()) {
                a.push_back(e.GetTx().GetHash().ToString());
            }
            mempool_sequence = pool.GetSequence();
        }
        if (!include_mempool_sequence) {
            return a;
        } else {
            UniValue o(UniValue::VOBJ);
            o.pushKV("txids", std::move(a));
            o.pushKV("mempool_sequence", mempool_sequence);
            return o;
        }
    }
}
 
static RPCMethod getmempoolfeeratediagram()
{
    return RPCMethod{"getmempoolfeeratediagram",
        "Returns the feerate diagram for the whole mempool.",
        {},
        {
            RPCResult{"mempool chunks",
                RPCResult::Type::ARR, "", "",
                {
                    {
                        RPCResult::Type::OBJ, "", "",
                        {
                            {RPCResult::Type::NUM, "weight", "cumulative sigops-adjusted weight"},
                            {RPCResult::Type::NUM, "fee", "cumulative fee"}
                        }
                    }
                }
            }
        },
        RPCExamples{
            HelpExampleCli("getmempoolfeeratediagram", "")
            + HelpExampleRpc("getmempoolfeeratediagram", "")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
        {
            const CTxMemPool& mempool = EnsureAnyMemPool(request.context);
            LOCK(mempool.cs);
 
            UniValue result(UniValue::VARR);
 
            auto diagram = mempool.GetFeerateDiagram();
 
            for (auto f : diagram) {
                UniValue o(UniValue::VOBJ);
                o.pushKV("weight", f.size);
                o.pushKV("fee", ValueFromAmount(f.fee));
                result.push_back(o);
            }
            return result;
        }
    };
}
 
static RPCMethod getrawmempool()
{
    return RPCMethod{
        "getrawmempool",
        "Returns all transaction ids in memory pool as a json array of string transaction ids.\n"
        "\nHint: use getmempoolentry to fetch a specific transaction from the mempool.\n",
        {
            {"verbose", RPCArg::Type::BOOL, RPCArg::Default{false}, "True for a json object, false for array of transaction ids"},
            {"mempool_sequence", RPCArg::Type::BOOL, RPCArg::Default{false}, "If verbose=false, returns a json object with transaction list and mempool sequence number attached."},
        },
        {
            RPCResult{"for verbose = false",
                RPCResult::Type::ARR, "", "",
                {
                    {RPCResult::Type::STR_HEX, "", "The transaction id"},
                }},
            RPCResult{"for verbose = true",
                RPCResult::Type::OBJ_DYN, "", "",
                {
                    {RPCResult::Type::OBJ, "transactionid", "", MempoolEntryDescription()},
                }},
            RPCResult{"for verbose = false and mempool_sequence = true",
                RPCResult::Type::OBJ, "", "",
                {
                    {RPCResult::Type::ARR, "txids", "",
                    {
                        {RPCResult::Type::STR_HEX, "", "The transaction id"},
                    }},
                    {RPCResult::Type::NUM, "mempool_sequence", "The mempool sequence value."},
                }},
        },
        RPCExamples{
            HelpExampleCli("getrawmempool", "true")
            + HelpExampleRpc("getrawmempool", "true")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
{
    bool fVerbose = false;
    if (!request.params[0].isNull())
        fVerbose = request.params[0].get_bool();
 
    bool include_mempool_sequence = false;
    if (!request.params[1].isNull()) {
        include_mempool_sequence = request.params[1].get_bool();
    }
 
    return MempoolToJSON(EnsureAnyMemPool(request.context), fVerbose, include_mempool_sequence);
},
    };
}
 
static RPCMethod getmempoolancestors()
{
    return RPCMethod{
        "getmempoolancestors",
        "If txid is in the mempool, returns all in-mempool ancestors.\n",
        {
            {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The transaction id (must be in mempool)"},
            {"verbose", RPCArg::Type::BOOL, RPCArg::Default{false}, "True for a json object, false for array of transaction ids"},
        },
        {
            RPCResult{"for verbose = false",
                RPCResult::Type::ARR, "", "",
                {{RPCResult::Type::STR_HEX, "", "The transaction id of an in-mempool ancestor transaction"}}},
            RPCResult{"for verbose = true",
                RPCResult::Type::OBJ_DYN, "", "",
                {
                    {RPCResult::Type::OBJ, "transactionid", "", MempoolEntryDescription()},
                }},
        },
        RPCExamples{
            HelpExampleCli("getmempoolancestors", "\"mytxid\"")
            + HelpExampleRpc("getmempoolancestors", "\"mytxid\"")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
{
    bool fVerbose = false;
    if (!request.params[1].isNull())
        fVerbose = request.params[1].get_bool();
 
    auto txid{Txid::FromUint256(ParseHashV(request.params[0], "txid"))};
 
    const CTxMemPool& mempool = EnsureAnyMemPool(request.context);
    LOCK(mempool.cs);
 
    const auto entry{mempool.GetEntry(txid)};
    if (entry == nullptr) {
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Transaction not in mempool");
    }
 
    auto ancestors{mempool.CalculateMemPoolAncestors(*entry)};
 
    if (!fVerbose) {
        UniValue o(UniValue::VARR);
        for (CTxMemPool::txiter ancestorIt : ancestors) {
            o.push_back(ancestorIt->GetTx().GetHash().ToString());
        }
        return o;
    } else {
        UniValue o(UniValue::VOBJ);
        for (CTxMemPool::txiter ancestorIt : ancestors) {
            const CTxMemPoolEntry &e = *ancestorIt;
            UniValue info(UniValue::VOBJ);
            entryToJSON(mempool, info, e);
            o.pushKV(e.GetTx().GetHash().ToString(), std::move(info));
        }
        return o;
    }
},
    };
}
 
static RPCMethod getmempooldescendants()
{
    return RPCMethod{
        "getmempooldescendants",
        "If txid is in the mempool, returns all in-mempool descendants.\n",
        {
            {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The transaction id (must be in mempool)"},
            {"verbose", RPCArg::Type::BOOL, RPCArg::Default{false}, "True for a json object, false for array of transaction ids"},
        },
        {
            RPCResult{"for verbose = false",
                RPCResult::Type::ARR, "", "",
                {{RPCResult::Type::STR_HEX, "", "The transaction id of an in-mempool descendant transaction"}}},
            RPCResult{"for verbose = true",
                RPCResult::Type::OBJ_DYN, "", "",
                {
                    {RPCResult::Type::OBJ, "transactionid", "", MempoolEntryDescription()},
                }},
        },
        RPCExamples{
            HelpExampleCli("getmempooldescendants", "\"mytxid\"")
            + HelpExampleRpc("getmempooldescendants", "\"mytxid\"")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
{
    bool fVerbose = false;
    if (!request.params[1].isNull())
        fVerbose = request.params[1].get_bool();
 
    auto txid{Txid::FromUint256(ParseHashV(request.params[0], "txid"))};
 
    const CTxMemPool& mempool = EnsureAnyMemPool(request.context);
    LOCK(mempool.cs);
 
    const auto it{mempool.GetIter(txid)};
    if (!it) {
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Transaction not in mempool");
    }
 
    CTxMemPool::setEntries setDescendants;
    mempool.CalculateDescendants(*it, setDescendants);
    // CTxMemPool::CalculateDescendants will include the given tx
    setDescendants.erase(*it);
 
    if (!fVerbose) {
        UniValue o(UniValue::VARR);
        for (CTxMemPool::txiter descendantIt : setDescendants) {
            o.push_back(descendantIt->GetTx().GetHash().ToString());
        }
 
        return o;
    } else {
        UniValue o(UniValue::VOBJ);
        for (CTxMemPool::txiter descendantIt : setDescendants) {
            const CTxMemPoolEntry &e = *descendantIt;
            UniValue info(UniValue::VOBJ);
            entryToJSON(mempool, info, e);
            o.pushKV(e.GetTx().GetHash().ToString(), std::move(info));
        }
        return o;
    }
},
    };
}
 
static RPCMethod getmempoolcluster()
{
    return RPCMethod{"getmempoolcluster",
        "Returns mempool data for given cluster\n",
        {
            {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The txid of a transaction in the cluster"},
        },
        RPCResult{
            RPCResult::Type::OBJ, "", "", ClusterDescription()},
        RPCExamples{
            HelpExampleCli("getmempoolcluster", "txid")
            + HelpExampleRpc("getmempoolcluster", "txid")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
{
    uint256 hash = ParseHashV(request.params[0], "txid");
 
    const CTxMemPool& mempool = EnsureAnyMemPool(request.context);
    LOCK(mempool.cs);
 
    auto txid = Txid::FromUint256(hash);
    const auto entry{mempool.GetEntry(txid)};
    if (entry == nullptr) {
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Transaction not in mempool");
    }
 
    auto cluster = mempool.GetCluster(txid);
 
    UniValue info(UniValue::VOBJ);
    clusterToJSON(mempool, info, cluster);
    return info;
},
    };
}
 
static RPCMethod getmempoolentry()
{
    return RPCMethod{
        "getmempoolentry",
        "Returns mempool data for given transaction\n",
        {
            {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The transaction id (must be in mempool)"},
        },
        RPCResult{
            RPCResult::Type::OBJ, "", "", MempoolEntryDescription()},
        RPCExamples{
            HelpExampleCli("getmempoolentry", "\"mytxid\"")
            + HelpExampleRpc("getmempoolentry", "\"mytxid\"")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
{
    auto txid{Txid::FromUint256(ParseHashV(request.params[0], "txid"))};
 
    const CTxMemPool& mempool = EnsureAnyMemPool(request.context);
    LOCK(mempool.cs);
 
    const auto entry{mempool.GetEntry(txid)};
    if (entry == nullptr) {
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Transaction not in mempool");
    }
 
    UniValue info(UniValue::VOBJ);
    entryToJSON(mempool, info, *entry);
    return info;
},
    };
}
 
static RPCMethod gettxspendingprevout()
{
    return RPCMethod{"gettxspendingprevout",
        "Scans the mempool (and the txospenderindex, if available) to find transactions spending any of the given outputs",
        {
            {"outputs", RPCArg::Type::ARR, RPCArg::Optional::NO, "The transaction outputs that we want to check, and within each, the txid (string) vout (numeric).",
                {
                    {"", RPCArg::Type::OBJ, RPCArg::Optional::OMITTED, "",
                        {
                            {"txid", RPCArg::Type::STR_HEX, RPCArg::Optional::NO, "The transaction id"},
                            {"vout", RPCArg::Type::NUM, RPCArg::Optional::NO, "The output number"},
                        },
                    },
                },
            },
            {"options", RPCArg::Type::OBJ_NAMED_PARAMS, RPCArg::Optional::OMITTED, "",
                {
                    {"mempool_only", RPCArg::Type::BOOL, RPCArg::DefaultHint{"true if txospenderindex unavailable, otherwise false"}, "If false and mempool lacks a relevant spend, use txospenderindex (throws an exception if not available)."},
                    {"return_spending_tx", RPCArg::Type::BOOL, RPCArg::DefaultHint{"false"}, "If true, return the full spending tx."},
                },
            },
        },
        RPCResult{
            RPCResult::Type::ARR, "", "",
            {
                {RPCResult::Type::OBJ, "", "",
                {
                    {RPCResult::Type::STR_HEX, "txid", "the transaction id of the checked output"},
                    {RPCResult::Type::NUM, "vout", "the vout value of the checked output"},
                    {RPCResult::Type::STR_HEX, "spendingtxid", /*optional=*/true, "the transaction id of the mempool transaction spending this output (omitted if unspent)"},
                    {RPCResult::Type::STR_HEX, "spendingtx", /*optional=*/true, "the transaction spending this output (only if return_spending_tx is set, omitted if unspent)"},
                    {RPCResult::Type::STR_HEX, "blockhash", /*optional=*/true, "the hash of the spending block (omitted if unspent or the spending tx is not confirmed)"},
                }},
            }
        },
        RPCExamples{
            HelpExampleCli("gettxspendingprevout", "\"[{\\\"txid\\\":\\\"a08e6907dbbd3d809776dbfc5d82e371b764ed838b5655e72f463568df1aadf0\\\",\\\"vout\\\":3}]\"")
            + HelpExampleRpc("gettxspendingprevout", "\"[{\\\"txid\\\":\\\"a08e6907dbbd3d809776dbfc5d82e371b764ed838b5655e72f463568df1aadf0\\\",\\\"vout\\\":3}]\"")
            + HelpExampleCliNamed("gettxspendingprevout", {{"outputs", "[{\"txid\":\"a08e6907dbbd3d809776dbfc5d82e371b764ed838b5655e72f463568df1aadf0\",\"vout\":3}]"}, {"return_spending_tx", true}})
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
        {
            const UniValue& output_params = request.params[0].get_array();
            if (output_params.empty()) {
                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, outputs are missing");
            }
            const UniValue options{request.params[1].isNull() ? UniValue::VOBJ : request.params[1]};
            RPCTypeCheckObj(options,
                            {
                                {"mempool_only", UniValueType(UniValue::VBOOL)},
                                {"return_spending_tx", UniValueType(UniValue::VBOOL)},
                            }, /*fAllowNull=*/true, /*fStrict=*/true);
 
            const bool mempool_only{options.exists("mempool_only") ? options["mempool_only"].get_bool() : !g_txospenderindex};
            const bool return_spending_tx{options.exists("return_spending_tx") ? options["return_spending_tx"].get_bool() : false};
 
            // Worklist of outpoints to resolve
            struct Entry {
                COutPoint outpoint;
                size_t request_index;
            };
            std::vector<Entry> prevouts_to_process;
            prevouts_to_process.reserve(output_params.size());
            for (const size_t idx : std::views::iota(size_t{0}, output_params.size())) {
                const UniValue& o = output_params[idx].get_obj();
 
                RPCTypeCheckObj(o,
                                {
                                    {"txid", UniValueType(UniValue::VSTR)},
                                    {"vout", UniValueType(UniValue::VNUM)},
                                }, /*fAllowNull=*/false, /*fStrict=*/true);
 
                const Txid txid = Txid::FromUint256(ParseHashO(o, "txid"));
                const int nOutput{o.find_value("vout").getInt<int>()};
                if (nOutput < 0) {
                    throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter, vout cannot be negative");
                }
                prevouts_to_process.emplace_back(COutPoint{txid, static_cast<uint32_t>(nOutput)}, idx);
            }
 
            auto make_output = [&output_params, return_spending_tx](const Entry& prevout, const CTransaction* spending_tx = nullptr) {
                UniValue o{output_params[prevout.request_index]};
                if (spending_tx) {
                    o.pushKV("spendingtxid", spending_tx->GetHash().ToString());
                    if (return_spending_tx) {
                        o.pushKV("spendingtx", EncodeHexTx(*spending_tx));
                    }
                }
                return o;
            };
 
            std::vector<UniValue> results(output_params.size());
 
            // Search the mempool first
            std::vector<Entry> unresolved;
            unresolved.reserve(prevouts_to_process.size());
            {
                const CTxMemPool& mempool = EnsureAnyMemPool(request.context);
                LOCK(mempool.cs);
 
                // Make the result if the spending tx appears in the mempool or this is a mempool_only request
                for (const auto& prevout : prevouts_to_process) {
                    const auto* spending_tx{mempool.GetConflictTx(prevout.outpoint)};
 
                    // If the outpoint is not spent in the mempool and this is not a mempool-only
                    // request, we cannot answer it yet.
                    if (!spending_tx && !mempool_only) {
                        unresolved.push_back(prevout);
                    } else {
                        results[prevout.request_index] = make_output(prevout, spending_tx);
                    }
                }
            }
 
            // mempool_only requests resolve every outpoint above, so only other requests reach the index.
            if (!unresolved.empty() && (!g_txospenderindex || !g_txospenderindex->BlockUntilSyncedToCurrentChain())) {
                throw JSONRPCError(RPC_MISC_ERROR, "Mempool lacks a relevant spend, and txospenderindex is unavailable.");
            }
 
            for (const auto& prevout : unresolved) {
                const auto spender{g_txospenderindex->FindSpender(prevout.outpoint)};
                if (!spender) {
                    throw JSONRPCError(RPC_MISC_ERROR, spender.error());
                }
 
                if (const auto& spender_opt{spender.value()}) {
                    UniValue o{make_output(prevout, spender_opt->tx.get())};
                    o.pushKV("blockhash", spender_opt->block_hash.GetHex());
                    results[prevout.request_index] = std::move(o);
                } else {
                    // Only return the input outpoint itself, which indicates it is unspent.
                    results[prevout.request_index] = make_output(prevout);
                }
            }
 
            UniValue result{UniValue::VARR};
            result.reserve(results.size());
            for (auto& output : results) result.push_back(std::move(output));
            return result;
        },
    };
}
 
UniValue MempoolInfoToJSON(const CTxMemPool& pool)
{
    // Make sure this call is atomic in the pool.
    LOCK(pool.cs);
    UniValue ret(UniValue::VOBJ);
    ret.pushKV("loaded", pool.GetLoadTried());
    ret.pushKV("size", pool.size());
    ret.pushKV("bytes", pool.GetTotalTxSize());
    ret.pushKV("usage", pool.DynamicMemoryUsage());
    ret.pushKV("total_fee", ValueFromAmount(pool.GetTotalFee()));
    ret.pushKV("maxmempool", pool.m_opts.max_size_bytes);
    ret.pushKV("mempoolminfee", ValueFromAmount(std::max(pool.GetMinFee(), pool.m_opts.min_relay_feerate).GetFeePerK()));
    ret.pushKV("minrelaytxfee", ValueFromAmount(pool.m_opts.min_relay_feerate.GetFeePerK()));
    ret.pushKV("incrementalrelayfee", ValueFromAmount(pool.m_opts.incremental_relay_feerate.GetFeePerK()));
    ret.pushKV("unbroadcastcount", pool.GetUnbroadcastTxs().size());
    ret.pushKV("permitbaremultisig", pool.m_opts.permit_bare_multisig);
    ret.pushKV("maxdatacarriersize", pool.m_opts.max_datacarrier_bytes.value_or(0));
    ret.pushKV("limitclustercount", pool.m_opts.limits.cluster_count);
    ret.pushKV("limitclustersize", pool.m_opts.limits.cluster_size_vbytes);
    ret.pushKV("optimal", pool.m_txgraph->DoWork(0)); // 0 work is a quick check for known optimality
    if (IsDeprecatedRPCEnabled("fullrbf")) {
        ret.pushKV("fullrbf", true);
    }
    return ret;
}
 
static RPCMethod getmempoolinfo()
{
    return RPCMethod{"getmempoolinfo",
        "Returns details on the active state of the TX memory pool.",
        {},
        RPCResult{
            RPCResult::Type::OBJ, "", "",
            [](){
                std::vector<RPCResult> list = {
                    {RPCResult::Type::BOOL, "loaded", "True if the initial load attempt of the persisted mempool finished"},
                    {RPCResult::Type::NUM, "size", "Current tx count"},
                    {RPCResult::Type::NUM, "bytes", "Sum of all virtual transaction sizes as defined in BIP 141. Differs from actual serialized size because witness data is discounted"},
                    {RPCResult::Type::NUM, "usage", "Total memory usage for the mempool"},
                    {RPCResult::Type::STR_AMOUNT, "total_fee", "Total fees for the mempool in " + CURRENCY_UNIT + ", ignoring modified fees through prioritisetransaction"},
                    {RPCResult::Type::NUM, "maxmempool", "Maximum memory usage for the mempool"},
                    {RPCResult::Type::STR_AMOUNT, "mempoolminfee", "Minimum fee rate in " + CURRENCY_UNIT + "/kvB for tx to be accepted. Is the maximum of minrelaytxfee and minimum mempool fee"},
                    {RPCResult::Type::STR_AMOUNT, "minrelaytxfee", "Current minimum relay fee for transactions"},
                    {RPCResult::Type::NUM, "incrementalrelayfee", "minimum fee rate increment for mempool limiting or replacement in " + CURRENCY_UNIT + "/kvB"},
                    {RPCResult::Type::NUM, "unbroadcastcount", "Current number of transactions that haven't passed initial broadcast yet"},
                    {RPCResult::Type::BOOL, "permitbaremultisig", "True if the mempool accepts transactions with bare multisig outputs"},
                    {RPCResult::Type::NUM, "maxdatacarriersize", "Maximum number of bytes that can be used by OP_RETURN outputs in the mempool"},
                    {RPCResult::Type::NUM, "limitclustercount", "Maximum number of transactions that can be in a cluster (configured by -limitclustercount)"},
                    {RPCResult::Type::NUM, "limitclustersize", "Maximum size of a cluster in virtual bytes (configured by -limitclustersize)"},
                    {RPCResult::Type::BOOL, "optimal", "If the mempool is in a known-optimal transaction ordering"},
                };
                if (IsDeprecatedRPCEnabled("fullrbf")) {
                    list.emplace_back(RPCResult::Type::BOOL, "fullrbf", "True if the mempool accepts RBF without replaceability signaling inspection (DEPRECATED)");
                }
                return list;
            }()
            },
        RPCExamples{
            HelpExampleCli("getmempoolinfo", "")
            + HelpExampleRpc("getmempoolinfo", "")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
{
    return MempoolInfoToJSON(EnsureAnyMemPool(request.context));
},
    };
}
 
static RPCMethod importmempool()
{
    return RPCMethod{
        "importmempool",
        "Import a mempool.dat file and attempt to add its contents to the mempool.\n"
        "Warning: Importing untrusted files is dangerous, especially if metadata from the file is taken over.",
        {
            {"filepath", RPCArg::Type::STR, RPCArg::Optional::NO, "The mempool file"},
            {"options",
             RPCArg::Type::OBJ_NAMED_PARAMS,
             RPCArg::Optional::OMITTED,
             "",
             {
                 {"use_current_time", RPCArg::Type::BOOL, RPCArg::Default{true},
                  "Whether to use the current system time or use the entry time metadata from the mempool file.\n"
                  "Warning: Importing untrusted metadata may lead to unexpected issues and undesirable behavior."},
                 {"apply_fee_delta_priority", RPCArg::Type::BOOL, RPCArg::Default{false},
                  "Whether to apply the fee delta metadata from the mempool file.\n"
                  "It will be added to any existing fee deltas.\n"
                  "The fee delta can be set by the prioritisetransaction RPC.\n"
                  "Warning: Importing untrusted metadata may lead to unexpected issues and undesirable behavior.\n"
                  "Only set this bool if you understand what it does."},
                 {"apply_unbroadcast_set", RPCArg::Type::BOOL, RPCArg::Default{false},
                  "Whether to apply the unbroadcast set metadata from the mempool file.\n"
                  "Warning: Importing untrusted metadata may lead to unexpected issues and undesirable behavior."},
             },
             RPCArgOptions{.oneline_description = "options"}},
        },
        RPCResult{RPCResult::Type::OBJ, "", "", std::vector<RPCResult>{}},
        RPCExamples{HelpExampleCli("importmempool", "/path/to/mempool.dat") + HelpExampleRpc("importmempool", "/path/to/mempool.dat")},
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue {
            const NodeContext& node{EnsureAnyNodeContext(request.context)};
 
            CTxMemPool& mempool{EnsureMemPool(node)};
            ChainstateManager& chainman = EnsureChainman(node);
            Chainstate& chainstate = chainman.ActiveChainstate();
 
            if (chainman.IsInitialBlockDownload()) {
                throw JSONRPCError(RPC_CLIENT_IN_INITIAL_DOWNLOAD, "Can only import the mempool after the block download and sync is done.");
            }
 
            const fs::path load_path{fs::u8path(self.Arg<std::string_view>("filepath"))};
            const UniValue& use_current_time{request.params[1]["use_current_time"]};
            const UniValue& apply_fee_delta{request.params[1]["apply_fee_delta_priority"]};
            const UniValue& apply_unbroadcast{request.params[1]["apply_unbroadcast_set"]};
            node::ImportMempoolOptions opts{
                .use_current_time = use_current_time.isNull() ? true : use_current_time.get_bool(),
                .apply_fee_delta_priority = apply_fee_delta.isNull() ? false : apply_fee_delta.get_bool(),
                .apply_unbroadcast_set = apply_unbroadcast.isNull() ? false : apply_unbroadcast.get_bool(),
            };
 
            if (!node::LoadMempool(mempool, load_path, chainstate, std::move(opts))) {
                throw JSONRPCError(RPC_MISC_ERROR, "Unable to import mempool file, see debug log for details.");
            }
 
            UniValue ret{UniValue::VOBJ};
            return ret;
        },
    };
}
 
static RPCMethod savemempool()
{
    return RPCMethod{
        "savemempool",
        "Dumps the mempool to disk. It will fail until the previous dump is fully loaded.\n",
        {},
        RPCResult{
            RPCResult::Type::OBJ, "", "",
            {
                {RPCResult::Type::STR, "filename", "the directory and file where the mempool was saved"},
            }},
        RPCExamples{
            HelpExampleCli("savemempool", "")
            + HelpExampleRpc("savemempool", "")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
{
    const ArgsManager& args{EnsureAnyArgsman(request.context)};
    const CTxMemPool& mempool = EnsureAnyMemPool(request.context);
 
    if (!mempool.GetLoadTried()) {
        throw JSONRPCError(RPC_MISC_ERROR, "The mempool was not loaded yet");
    }
 
    const fs::path& dump_path = MempoolPath(args);
 
    if (!DumpMempool(mempool, dump_path)) {
        throw JSONRPCError(RPC_MISC_ERROR, "Unable to dump mempool to disk");
    }
 
    UniValue ret(UniValue::VOBJ);
    ret.pushKV("filename", dump_path.utf8string());
 
    return ret;
},
    };
}
 
static std::vector<RPCResult> OrphanDescription()
{
    return {
        RPCResult{RPCResult::Type::STR_HEX, "txid", "The transaction hash in hex"},
        RPCResult{RPCResult::Type::STR_HEX, "wtxid", "The transaction witness hash in hex"},
        RPCResult{RPCResult::Type::NUM, "bytes", "The serialized transaction size in bytes"},
        RPCResult{RPCResult::Type::NUM, "vsize", "(DEPRECATED) use vsize_bip141 instead. The virtual transaction size as defined in BIP 141. This is different from actual serialized size for witness transactions as witness data is discounted."},
        RPCResult{RPCResult::Type::NUM, "vsize_bip141", "The virtual transaction size as defined in BIP 141. This is different from actual serialized size for witness transactions as witness data is discounted."},
        RPCResult{RPCResult::Type::NUM, "weight", "The transaction weight as defined in BIP 141."},
        RPCResult{RPCResult::Type::ARR, "from", "",
        {
            RPCResult{RPCResult::Type::NUM, "peer_id", "Peer ID"},
        }},
    };
}
 
static UniValue OrphanToJSON(const node::TxOrphanage::OrphanInfo& orphan)
{
    UniValue o(UniValue::VOBJ);
    o.pushKV("txid", orphan.tx->GetHash().ToString());
    o.pushKV("wtxid", orphan.tx->GetWitnessHash().ToString());
    o.pushKV("bytes", orphan.tx->ComputeTotalSize());
    o.pushKV("vsize", GetVirtualTransactionSize(*orphan.tx));
    o.pushKV("vsize_bip141", GetVirtualTransactionSize(*orphan.tx));
    o.pushKV("weight", GetTransactionWeight(*orphan.tx));
    UniValue from(UniValue::VARR);
    for (const auto fromPeer: orphan.announcers) {
        from.push_back(fromPeer);
    }
    o.pushKV("from", from);
    return o;
}
 
static RPCMethod getorphantxs()
{
    return RPCMethod{
        "getorphantxs",
        "Shows transactions in the tx orphanage.\n"
        "\nEXPERIMENTAL warning: this call may be changed in future releases.\n",
        {
            {"verbosity", RPCArg::Type::NUM, RPCArg::Default{0}, "0 for an array of txids (may contain duplicates), 1 for an array of objects with tx details, and 2 for details from (1) and tx hex",
             RPCArgOptions{.skip_type_check = true}},
        },
        {
            RPCResult{"for verbose = 0",
                RPCResult::Type::ARR, "", "",
                {
                    {RPCResult::Type::STR_HEX, "txid", "The transaction hash in hex"},
                }},
            RPCResult{"for verbose = 1",
                RPCResult::Type::ARR, "", "",
                {
                    {RPCResult::Type::OBJ, "", "", OrphanDescription()},
                }},
            RPCResult{"for verbose = 2",
                RPCResult::Type::ARR, "", "",
                {
                    {RPCResult::Type::OBJ, "", "",
                        Cat<std::vector<RPCResult>>(
                            OrphanDescription(),
                            {{RPCResult::Type::STR_HEX, "hex", "The serialized, hex-encoded transaction data"}}
                        )
                    },
                }},
        },
        RPCExamples{
            HelpExampleCli("getorphantxs", "2")
            + HelpExampleRpc("getorphantxs", "2")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
        {
            const NodeContext& node = EnsureAnyNodeContext(request.context);
            PeerManager& peerman = EnsurePeerman(node);
            std::vector<node::TxOrphanage::OrphanInfo> orphanage = peerman.GetOrphanTransactions();
 
            int verbosity{ParseVerbosity(request.params[0], /*default_verbosity=*/0, /*allow_bool=*/false)};
 
            UniValue ret(UniValue::VARR);
 
            if (verbosity == 0) {
                for (auto const& orphan : orphanage) {
                    ret.push_back(orphan.tx->GetHash().ToString());
                }
            } else if (verbosity == 1) {
                for (auto const& orphan : orphanage) {
                    ret.push_back(OrphanToJSON(orphan));
                }
            } else if (verbosity == 2) {
                for (auto const& orphan : orphanage) {
                    UniValue o{OrphanToJSON(orphan)};
                    o.pushKV("hex", EncodeHexTx(*orphan.tx));
                    ret.push_back(o);
                }
            } else {
                throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid verbosity value " + ToString(verbosity));
            }
 
            return ret;
        },
    };
}
 
static RPCMethod submitpackage()
{
    return RPCMethod{"submitpackage",
        "Submit a package of raw transactions (serialized, hex-encoded) to local node.\n"
        "The package will be validated according to consensus and mempool policy rules. If any transaction passes, it will be accepted to mempool.\n"
        "This RPC is experimental and the interface may be unstable. Refer to doc/policy/packages.md for documentation on package policies.\n"
        "Warning: successful submission does not mean the transactions will propagate throughout the network.\n"
        ,
        {
            {"package", RPCArg::Type::ARR, RPCArg::Optional::NO, "An array of raw transactions.\n"
                "The package must consist of a transaction with (some, all, or none of) its unconfirmed parents. A single transaction is permitted.\n"
                "None of the parents may depend on each other. Parents that are already in mempool do not need to be present in the package.\n"
                "The package must be topologically sorted, with the child being the last element in the array if there are multiple elements.",
                {
                    {"rawtx", RPCArg::Type::STR_HEX, RPCArg::Optional::OMITTED, ""},
                },
            },
            {"maxfeerate", RPCArg::Type::AMOUNT, RPCArg::Default{FormatMoney(DEFAULT_MAX_RAW_TX_FEE_RATE.GetFeePerK())},
             "Reject transactions whose fee rate is higher than the specified value, expressed in " + CURRENCY_UNIT +
                 "/kvB.\nFee rates larger than 1BTC/kvB are rejected.\nSet to 0 to accept any fee rate."},
            {"maxburnamount", RPCArg::Type::AMOUNT, RPCArg::Default{FormatMoney(DEFAULT_MAX_BURN_AMOUNT)},
             "Reject transactions with provably unspendable outputs (e.g. 'datacarrier' outputs that use the OP_RETURN opcode) greater than the specified value, expressed in " + CURRENCY_UNIT + ".\n"
             "If burning funds through unspendable outputs is desired, increase this value.\n"
             "This check is based on heuristics and does not guarantee spendability of outputs.\n"
            },
        },
        RPCResult{
            RPCResult::Type::OBJ, "", "",
            {
                {RPCResult::Type::STR, "package_msg", "The transaction package result message. \"success\" indicates all transactions were accepted into or are already in the mempool."},
                {RPCResult::Type::OBJ_DYN, "tx-results", "The transaction results keyed by wtxid. An entry is returned for every submitted wtxid.",
                {
                    {RPCResult::Type::OBJ, "wtxid", "transaction wtxid", {
                        {RPCResult::Type::STR_HEX, "txid", "The transaction hash in hex"},
                        {RPCResult::Type::STR_HEX, "other-wtxid", /*optional=*/true, "The wtxid of a different transaction with the same txid but different witness found in the mempool. This means the submitted transaction was ignored."},
                        {RPCResult::Type::NUM, "vsize_adjusted", /*optional=*/true, "Maximum of sigop-adjusted size (-bytespersigop) and virtual transaction size as defined in BIP 141."},
                        {RPCResult::Type::NUM, "vsize", /*optional=*/true, "(DEPRECATED) Was previously erroneously described as the BIP 141 vsize, but is actually sigops-adjusted vsize.\n"
                                                                    "Use vsize_bip141 to actually get that behavior or switch to the explicit vsize_adjusted for retained behavior."},
                        {RPCResult::Type::NUM, "vsize_bip141", /*optional=*/true, "Virtual transaction size as defined in BIP 141."},
                        {RPCResult::Type::OBJ, "fees", /*optional=*/true, "Transaction fees", {
                            {RPCResult::Type::STR_AMOUNT, "base", "transaction fee in " + CURRENCY_UNIT},
                            {RPCResult::Type::STR_AMOUNT, "effective-feerate", /*optional=*/true, "if the transaction was not already in the mempool, the effective feerate in " + CURRENCY_UNIT + " per KvB. For example, the package feerate and/or feerate with modified fees from prioritisetransaction."},
                            {RPCResult::Type::ARR, "effective-includes", /*optional=*/true, "if effective-feerate is provided, the wtxids of the transactions whose fees and vsizes are included in effective-feerate.",
                                {{RPCResult::Type::STR_HEX, "", "transaction wtxid in hex"},
                            }},
                        }},
                        {RPCResult::Type::STR, "error", /*optional=*/true, "Error string if rejected from mempool, or \"package-not-validated\" when the package aborts before any per-tx processing."},
                    }}
                }},
                {RPCResult::Type::ARR, "replaced-transactions", /*optional=*/true, "List of txids of replaced transactions",
                {
                    {RPCResult::Type::STR_HEX, "", "The transaction id"},
                }},
            },
        },
        RPCExamples{
            HelpExampleRpc("submitpackage", R"(["raw-parent-tx-1", "raw-parent-tx-2", "raw-child-tx"])") +
            HelpExampleCli("submitpackage", R"('["raw-tx-without-unconfirmed-parents"]')")
        },
        [](const RPCMethod& self, const JSONRPCRequest& request) -> UniValue
        {
            const UniValue raw_transactions = request.params[0].get_array();
            if (raw_transactions.empty() || raw_transactions.size() > MAX_PACKAGE_COUNT) {
                throw JSONRPCError(RPC_INVALID_PARAMETER,
                                   "Array must contain between 1 and " + ToString(MAX_PACKAGE_COUNT) + " transactions.");
            }
 
            // Fee check needs to be run with chainstate and package context
            const CFeeRate max_raw_tx_fee_rate{ParseFeeRate(self.Arg<UniValue>("maxfeerate"))};
            std::optional<CFeeRate> client_maxfeerate{max_raw_tx_fee_rate};
            // 0-value is special; it's mapped to no sanity check
            if (max_raw_tx_fee_rate == CFeeRate(0)) {
                client_maxfeerate = std::nullopt;
            }
 
            // Burn sanity check is run with no context
            const CAmount max_burn_amount = request.params[2].isNull() ? 0 : AmountFromValue(request.params[2]);
 
            std::vector<CTransactionRef> txns;
            txns.reserve(raw_transactions.size());
            for (const auto& rawtx : raw_transactions.getValues()) {
                CMutableTransaction mtx;
                if (!DecodeHexTx(mtx, rawtx.get_str())) {
                    throw JSONRPCError(RPC_DESERIALIZATION_ERROR,
                                       "TX decode failed: " + rawtx.get_str() + " Make sure the tx has at least one input.");
                }
 
                for (const auto& out : mtx.vout) {
                    if((out.scriptPubKey.IsUnspendable() || !out.scriptPubKey.HasValidOps()) && out.nValue > max_burn_amount) {
                        throw JSONRPCTransactionError(TransactionError::MAX_BURN_EXCEEDED);
                    }
                }
 
                txns.emplace_back(MakeTransactionRef(std::move(mtx)));
            }
            CHECK_NONFATAL(!txns.empty());
            if (txns.size() > 1 && !IsChildWithParentsTree(txns)) {
                throw JSONRPCTransactionError(TransactionError::INVALID_PACKAGE, "package topology disallowed. not child-with-parents or parents depend on each other.");
            }
 
            NodeContext& node = EnsureAnyNodeContext(request.context);
            CTxMemPool& mempool = EnsureMemPool(node);
            Chainstate& chainstate = EnsureChainman(node).ActiveChainstate();
            const auto package_result = WITH_LOCK(::cs_main, return ProcessNewPackage(chainstate, mempool, txns, /*test_accept=*/ false, client_maxfeerate));
 
            std::string package_msg = "success";
 
            // First catch package-wide errors, continue if we can
            switch(package_result.m_state.GetResult()) {
                case PackageValidationResult::PCKG_RESULT_UNSET:
                {
                    // Belt-and-suspenders check; everything should be successful here
                    CHECK_NONFATAL(package_result.m_tx_results.size() == txns.size());
                    for (const auto& tx : txns) {
                        CHECK_NONFATAL(mempool.exists(tx->GetHash()));
                    }
                    break;
                }
                case PackageValidationResult::PCKG_MEMPOOL_ERROR:
                {
                    // This only happens with internal bug; user should stop and report
                    throw JSONRPCTransactionError(TransactionError::MEMPOOL_ERROR,
                        package_result.m_state.GetRejectReason());
                }
                case PackageValidationResult::PCKG_POLICY:
                case PackageValidationResult::PCKG_TX:
                {
                    // Package-wide error we want to return, but we also want to return individual responses
                    package_msg = package_result.m_state.ToString();
                    CHECK_NONFATAL(package_result.m_tx_results.size() == txns.size() ||
                            package_result.m_tx_results.empty());
                    break;
                }
            }
 
            size_t num_broadcast{0};
            for (const auto& tx : txns) {
                // We don't want to re-submit the txn for validation in BroadcastTransaction
                if (!mempool.exists(tx->GetHash())) {
                    continue;
                }
 
                // We do not expect an error here; we are only broadcasting things already/still in mempool
                std::string err_string;
                const auto err = BroadcastTransaction(node,
                                                      tx,
                                                      err_string,
                                                      /*max_tx_fee=*/0,
                                                      node::TxBroadcast::MEMPOOL_AND_BROADCAST_TO_ALL,
                                                      /*wait_callback=*/true);
                if (err != TransactionError::OK) {
                    throw JSONRPCTransactionError(err,
                        strprintf("transaction broadcast failed: %s (%d transactions were broadcast successfully)",
                            err_string, num_broadcast));
                }
                num_broadcast++;
            }
 
            UniValue rpc_result{UniValue::VOBJ};
            rpc_result.pushKV("package_msg", package_msg);
            UniValue tx_result_map{UniValue::VOBJ};
            std::set<Txid> replaced_txids;
            for (const auto& tx : txns) {
                UniValue result_inner{UniValue::VOBJ};
                result_inner.pushKV("txid", tx->GetHash().GetHex());
                const auto wtxid_hex = tx->GetWitnessHash().GetHex();
                auto it = package_result.m_tx_results.find(tx->GetWitnessHash());
                if (it == package_result.m_tx_results.end()) {
                    // No per-tx result for this wtxid
                    // Current invariant: per-tx results are all-or-none (every member or empty on package abort).
                    // If any exist yet this one is missing, it's an unexpected partial map.
                    CHECK_NONFATAL(package_result.m_tx_results.empty());
                    result_inner.pushKV("error", "package-not-validated");
                    tx_result_map.pushKV(wtxid_hex, std::move(result_inner));
                    continue;
                }
                const auto& tx_result = it->second;
                switch(it->second.m_result_type) {
                case MempoolAcceptResult::ResultType::DIFFERENT_WITNESS:
                    result_inner.pushKV("other-wtxid", it->second.m_other_wtxid.value().GetHex());
                    break;
                case MempoolAcceptResult::ResultType::INVALID:
                    result_inner.pushKV("error", it->second.m_state.ToString());
                    break;
                case MempoolAcceptResult::ResultType::VALID:
                case MempoolAcceptResult::ResultType::MEMPOOL_ENTRY:
                    result_inner.pushKV("vsize_adjusted", it->second.m_vsize.value());
                    result_inner.pushKV("vsize", it->second.m_vsize.value());
                    result_inner.pushKV("vsize_bip141", GetVirtualTransactionSize(*tx));
                    UniValue fees(UniValue::VOBJ);
                    fees.pushKV("base", ValueFromAmount(it->second.m_base_fees.value()));
                    if (tx_result.m_result_type == MempoolAcceptResult::ResultType::VALID) {
                        // Effective feerate is not provided for MEMPOOL_ENTRY transactions even
                        // though modified fees is known, because it is unknown whether package
                        // feerate was used when it was originally submitted.
                        fees.pushKV("effective-feerate", ValueFromAmount(tx_result.m_effective_feerate.value().GetFeePerK()));
                        UniValue effective_includes_res(UniValue::VARR);
                        for (const auto& wtxid : tx_result.m_wtxids_fee_calculations.value()) {
                            effective_includes_res.push_back(wtxid.ToString());
                        }
                        fees.pushKV("effective-includes", std::move(effective_includes_res));
                    }
                    result_inner.pushKV("fees", std::move(fees));
                    for (const auto& ptx : it->second.m_replaced_transactions) {
                        replaced_txids.insert(ptx->GetHash());
                    }
                    break;
                }
                tx_result_map.pushKV(wtxid_hex, std::move(result_inner));
            }
            rpc_result.pushKV("tx-results", std::move(tx_result_map));
            UniValue replaced_list(UniValue::VARR);
            for (const auto& txid : replaced_txids) replaced_list.push_back(txid.ToString());
            rpc_result.pushKV("replaced-transactions", std::move(replaced_list));
            return rpc_result;
        },
    };
}
 
void RegisterMempoolRPCCommands(CRPCTable& t)
{
    static const CRPCCommand commands[]{
        {"rawtransactions", &sendrawtransaction},
        {"rawtransactions", &getprivatebroadcastinfo},
        {"rawtransactions", &abortprivatebroadcast},
        {"rawtransactions", &testmempoolaccept},
        {"blockchain", &getmempoolancestors},
        {"blockchain", &getmempooldescendants},
        {"blockchain", &getmempoolentry},
        {"blockchain", &getmempoolcluster},
        {"blockchain", &gettxspendingprevout},
        {"blockchain", &getmempoolinfo},
        {"hidden", &getmempoolfeeratediagram},
        {"blockchain", &getrawmempool},
        {"blockchain", &importmempool},
        {"blockchain", &savemempool},
        {"hidden", &getorphantxs},
        {"rawtransactions", &submitpackage},
    };
    for (const auto& c : commands) {
        t.appendCommand(c.name, &c);
    }
}