blockchain.cpp

// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2015 The Bitcoin Core developers
// Copyright (c) 2014-2019 The Dash 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 "amount.h"
#include "chain.h"
#include "chainparams.h"
#include "checkpoints.h"
#include "coins.h"
#include "core_io.h"
#include "consensus/validation.h"
#include "validation.h"
#include "core_io.h"
// #include "index/txindex.h"
#include "policy/feerate.h"
#include "policy/policy.h"
#include "primitives/transaction.h"
#include "rpc/server.h"
#include "streams.h"
#include "sync.h"
#include "txdb.h"
#include "txmempool.h"
#include "util.h"
#include "utilstrencodings.h"
#include "hash.h"
#include "warnings.h"

#include "evo/specialtx.h"
#include "evo/cbtx.h"

#include "llmq/quorums_chainlocks.h"
#include "llmq/quorums_instantsend.h"

#include <stdint.h>

#include <univalue.h>

#include <boost/algorithm/string.hpp>
#include <boost/thread/thread.hpp> // boost::thread::interrupt

#include <mutex>
#include <condition_variable>

struct CUpdatedBlock
{
    uint256 hash;
    int height;
};

static std::mutex cs_blockchange;
static std::condition_variable cond_blockchange;
static CUpdatedBlock latestblock;

extern void TxToJSON(const CTransaction& tx, const uint256 hashBlock, UniValue& entry);

double GetDifficulty(const CBlockIndex* blockindex)
{
    if (blockindex == nullptr)
    {
        if (chainActive.Tip() == nullptr)
            return 1.0;
        else
            blockindex = chainActive.Tip();
    }

    int nShift = (blockindex->nBits >> 24) & 0xff;

    double dDiff =
        (double)0x0000ffff / (double)(blockindex->nBits & 0x00ffffff);

    while (nShift < 29)
    {
        dDiff *= 256.0;
        nShift++;
    }
    while (nShift > 29)
    {
        dDiff /= 256.0;
        nShift--;
    }

    return dDiff;
}

UniValue blockheaderToJSON(const CBlockIndex* blockindex)
{
    UniValue result(UniValue::VOBJ);
    result.push_back(Pair("hash", blockindex->GetBlockHash().GetHex()));
    int confirmations = -1;
    // Only report confirmations if the block is on the main chain
    if (chainActive.Contains(blockindex))
        confirmations = chainActive.Height() - blockindex->nHeight + 1;
    result.push_back(Pair("confirmations", confirmations));
    result.push_back(Pair("height", blockindex->nHeight));
    result.push_back(Pair("version", blockindex->nVersion));
    result.push_back(Pair("versionHex", strprintf("%08x", blockindex->nVersion)));
    result.push_back(Pair("merkleroot", blockindex->hashMerkleRoot.GetHex()));
    result.push_back(Pair("time", (int64_t)blockindex->nTime));
    result.push_back(Pair("mediantime", (int64_t)blockindex->GetMedianTimePast()));
    result.push_back(Pair("nonce", (uint64_t)blockindex->nNonce));
    result.push_back(Pair("bits", strprintf("%08x", blockindex->nBits)));
    result.push_back(Pair("difficulty", GetDifficulty(blockindex)));
    result.push_back(Pair("chainwork", blockindex->nChainWork.GetHex()));

    if (blockindex->pprev)
        result.push_back(Pair("previousblockhash", blockindex->pprev->GetBlockHash().GetHex()));
    CBlockIndex *pnext = chainActive.Next(blockindex);
    if (pnext)
        result.push_back(Pair("nextblockhash", pnext->GetBlockHash().GetHex()));

    result.push_back(Pair("chainlock", llmq::chainLocksHandler->HasChainLock(blockindex->nHeight, blockindex->GetBlockHash())));

    return result;
}

UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool txDetails)
{
    UniValue result(UniValue::VOBJ);
    result.push_back(Pair("hash", blockindex->GetBlockHash().GetHex()));
    int confirmations = -1;
    // Only report confirmations if the block is on the main chain
    if (chainActive.Contains(blockindex))
        confirmations = chainActive.Height() - blockindex->nHeight + 1;
    result.push_back(Pair("confirmations", confirmations));
    result.push_back(Pair("size", (int)::GetSerializeSize(block, SER_NETWORK, PROTOCOL_VERSION)));
    result.push_back(Pair("height", blockindex->nHeight));
    result.push_back(Pair("version", block.nVersion));
    result.push_back(Pair("versionHex", strprintf("%08x", block.nVersion)));
    result.push_back(Pair("merkleroot", block.hashMerkleRoot.GetHex()));
    bool chainLock = llmq::chainLocksHandler->HasChainLock(blockindex->nHeight, blockindex->GetBlockHash());
    UniValue txs(UniValue::VARR);
    for(const auto& tx : block.vtx)
    {
        if(txDetails)
        {
            UniValue objTx(UniValue::VOBJ);
            TxToUniv(*tx, uint256(), objTx);
            bool fLocked = llmq::quorumInstantSendManager->IsLocked(tx->GetHash());
            objTx.push_back(Pair("instantlock", fLocked || chainLock));
            objTx.push_back(Pair("instantlock_internal", fLocked));
            txs.push_back(objTx);
        }
        else
            txs.push_back(tx->GetHash().GetHex());
    }
    result.push_back(Pair("tx", txs));
    if (!block.vtx[0]->vExtraPayload.empty()) {
        CCbTx cbTx;
        if (GetTxPayload(block.vtx[0]->vExtraPayload, cbTx)) {
            UniValue cbTxObj;
            cbTx.ToJson(cbTxObj);
            result.push_back(Pair("cbTx", cbTxObj));
        }
    }
    result.push_back(Pair("time", block.GetBlockTime()));
    result.push_back(Pair("mediantime", (int64_t)blockindex->GetMedianTimePast()));
    result.push_back(Pair("nonce", (uint64_t)block.nNonce));
    result.push_back(Pair("bits", strprintf("%08x", block.nBits)));
    result.push_back(Pair("difficulty", GetDifficulty(blockindex)));
    result.push_back(Pair("chainwork", blockindex->nChainWork.GetHex()));

    if (blockindex->pprev)
        result.push_back(Pair("previousblockhash", blockindex->pprev->GetBlockHash().GetHex()));
    CBlockIndex *pnext = chainActive.Next(blockindex);
    if (pnext)
        result.push_back(Pair("nextblockhash", pnext->GetBlockHash().GetHex()));

    result.push_back(Pair("chainlock", chainLock));

    return result;
}

UniValue getblockcount(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
            "getblockcount\n"
            "\nReturns the number of blocks in the longest blockchain.\n"
            "\nResult:\n"
            "n    (numeric) The current block count\n"
            "\nExamples:\n"
            + HelpExampleCli("getblockcount", "")
            + HelpExampleRpc("getblockcount", "")
        );

    LOCK(cs_main);
    return chainActive.Height();
}

UniValue getbestblockhash(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
            "getbestblockhash\n"
            "\nReturns the hash of the best (tip) block in the longest blockchain.\n"
            "\nResult:\n"
            "\"hex\"      (string) the block hash hex encoded\n"
            "\nExamples:\n"
            + HelpExampleCli("getbestblockhash", "")
            + HelpExampleRpc("getbestblockhash", "")
        );

    LOCK(cs_main);
    return chainActive.Tip()->GetBlockHash().GetHex();
}

UniValue getbestchainlock(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
            "getbestchainlock\n"
            "\nReturns the block hash of the best chainlock. Throws an error if there is no known chainlock yet.\n"
            "\nResult:\n"
            "{\n"
            "  \"blockhash\" : \"hash\",      (string) The block hash hex encoded\n"
            "  \"height\" : n,              (numeric) The block height or index\n"
            "  \"known_block\" : true|false (boolean) True if the block is known by our node\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getbestchainlock", "")
            + HelpExampleRpc("getbestchainlock", "")
        );
    UniValue result(UniValue::VOBJ);
    llmq::CChainLockSig clsig = llmq::chainLocksHandler->GetBestChainLock();
    if (clsig.IsNull()) {
        throw JSONRPCError(RPC_INTERNAL_ERROR, "Unable to find any chainlock");
    }
    result.push_back(Pair("blockhash", clsig.blockHash.GetHex()));
    result.push_back(Pair("height", clsig.nHeight));
    LOCK(cs_main);
    result.push_back(Pair("known_block", mapBlockIndex.count(clsig.blockHash) > 0));
    return result;
}

void RPCNotifyBlockChange(bool ibd, const CBlockIndex * pindex)
{
    if(pindex) {
        std::lock_guard<std::mutex> lock(cs_blockchange);
        latestblock.hash = pindex->GetBlockHash();
        latestblock.height = pindex->nHeight;
    }
    cond_blockchange.notify_all();
}

UniValue waitfornewblock(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() > 1)
        throw std::runtime_error(
            "waitfornewblock (timeout)\n"
            "\nWaits for a specific new block and returns useful info about it.\n"
            "\nReturns the current block on timeout or exit.\n"
            "\nArguments:\n"
            "1. timeout (int, optional, default=0) Time in milliseconds to wait for a response. 0 indicates no timeout.\n"
            "\nResult:\n"
            "{                           (json object)\n"
            "  \"hash\" : {       (string) The blockhash\n"
            "  \"height\" : {     (int) Block height\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("waitfornewblock", "1000")
            + HelpExampleRpc("waitfornewblock", "1000")
        );
    int timeout = 0;
    if (!request.params[0].isNull())
        timeout = request.params[0].get_int();

    CUpdatedBlock block;
    {
        std::unique_lock<std::mutex> lock(cs_blockchange);
        block = latestblock;
        if(timeout)
            cond_blockchange.wait_for(lock, std::chrono::milliseconds(timeout), [&block]{return latestblock.height != block.height || latestblock.hash != block.hash || !IsRPCRunning(); });
        else
            cond_blockchange.wait(lock, [&block]{return latestblock.height != block.height || latestblock.hash != block.hash || !IsRPCRunning(); });
        block = latestblock;
    }
    UniValue ret(UniValue::VOBJ);
    ret.push_back(Pair("hash", block.hash.GetHex()));
    ret.push_back(Pair("height", block.height));
    return ret;
}

UniValue waitforblock(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
        throw std::runtime_error(
            "waitforblock <blockhash> (timeout)\n"
            "\nWaits for a specific new block and returns useful info about it.\n"
            "\nReturns the current block on timeout or exit.\n"
            "\nArguments:\n"
            "1. \"blockhash\" (required, string) Block hash to wait for.\n"
            "2. timeout       (int, optional, default=0) Time in milliseconds to wait for a response. 0 indicates no timeout.\n"
            "\nResult:\n"
            "{                           (json object)\n"
            "  \"hash\" : {       (string) The blockhash\n"
            "  \"height\" : {     (int) Block height\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("waitforblock", "\"0000000000079f8ef3d2c688c244eb7a4570b24c9ed7b4a8c619eb02596f8862\", 1000")
            + HelpExampleRpc("waitforblock", "\"0000000000079f8ef3d2c688c244eb7a4570b24c9ed7b4a8c619eb02596f8862\", 1000")
        );
    int timeout = 0;

    uint256 hash = uint256S(request.params[0].get_str());

    if (!request.params[1].isNull())
        timeout = request.params[1].get_int();

    CUpdatedBlock block;
    {
        std::unique_lock<std::mutex> lock(cs_blockchange);
        if(timeout)
            cond_blockchange.wait_for(lock, std::chrono::milliseconds(timeout), [&hash]{return latestblock.hash == hash || !IsRPCRunning();});
        else
            cond_blockchange.wait(lock, [&hash]{return latestblock.hash == hash || !IsRPCRunning(); });
        block = latestblock;
    }

    UniValue ret(UniValue::VOBJ);
    ret.push_back(Pair("hash", block.hash.GetHex()));
    ret.push_back(Pair("height", block.height));
    return ret;
}

UniValue waitforblockheight(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
        throw std::runtime_error(
            "waitforblockheight <height> (timeout)\n"
            "\nWaits for (at least) block height and returns the height and hash\n"
            "of the current tip.\n"
            "\nReturns the current block on timeout or exit.\n"
            "\nArguments:\n"
            "1. height  (required, int) Block height to wait for (int)\n"
            "2. timeout (int, optional, default=0) Time in milliseconds to wait for a response. 0 indicates no timeout.\n"
            "\nResult:\n"
            "{                           (json object)\n"
            "  \"hash\" : {       (string) The blockhash\n"
            "  \"height\" : {     (int) Block height\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("waitforblockheight", "\"100\", 1000")
            + HelpExampleRpc("waitforblockheight", "\"100\", 1000")
        );
    int timeout = 0;

    int height = request.params[0].get_int();

    if (!request.params[1].isNull())
        timeout = request.params[1].get_int();

    CUpdatedBlock block;
    {
        std::unique_lock<std::mutex> lock(cs_blockchange);
        if(timeout)
            cond_blockchange.wait_for(lock, std::chrono::milliseconds(timeout), [&height]{return latestblock.height >= height || !IsRPCRunning();});
        else
            cond_blockchange.wait(lock, [&height]{return latestblock.height >= height || !IsRPCRunning(); });
        block = latestblock;
    }
    UniValue ret(UniValue::VOBJ);
    ret.push_back(Pair("hash", block.hash.GetHex()));
    ret.push_back(Pair("height", block.height));
    return ret;
}

UniValue getdifficulty(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
            "getdifficulty\n"
            "\nReturns the proof-of-work difficulty as a multiple of the minimum difficulty.\n"
            "\nResult:\n"
            "n.nnn       (numeric) the proof-of-work difficulty as a multiple of the minimum difficulty.\n"
            "\nExamples:\n"
            + HelpExampleCli("getdifficulty", "")
            + HelpExampleRpc("getdifficulty", "")
        );

    LOCK(cs_main);
    return GetDifficulty();
}

std::string EntryDescriptionString()
{
    return "    \"size\" : n,                 (numeric) transaction size in bytes\n"
           "    \"fee\" : n,                  (numeric) transaction fee in " + CURRENCY_UNIT + "\n"
           "    \"modifiedfee\" : n,          (numeric) transaction fee with fee deltas used for mining priority\n"
           "    \"time\" : n,                 (numeric) local time transaction entered pool in seconds since 1 Jan 1970 GMT\n"
           "    \"height\" : n,               (numeric) block height when transaction entered pool\n"
           "    \"descendantcount\" : n,      (numeric) number of in-mempool descendant transactions (including this one)\n"
           "    \"descendantsize\" : n,       (numeric) size of in-mempool descendants (including this one)\n"
           "    \"descendantfees\" : n,       (numeric) modified fees (see above) of in-mempool descendants (including this one)\n"
           "    \"ancestorcount\" : n,        (numeric) number of in-mempool ancestor transactions (including this one)\n"
           "    \"ancestorsize\" : n,         (numeric) size of in-mempool ancestors (including this one)\n"
           "    \"ancestorfees\" : n,         (numeric) modified fees (see above) of in-mempool ancestors (including this one)\n"
           "    \"depends\" : [               (array) unconfirmed transactions used as inputs for this transaction\n"
           "        \"transactionid\",        (string) parent transaction id\n"
           "       ... ],\n"
           "    \"instantlock\" : true|false  (boolean) True if this transaction was locked via InstantSend\n";
}

void entryToJSON(UniValue &info, const CTxMemPoolEntry &e)
{
    AssertLockHeld(mempool.cs);

    info.push_back(Pair("size", (int)e.GetTxSize()));
    info.push_back(Pair("fee", ValueFromAmount(e.GetFee())));
    info.push_back(Pair("modifiedfee", ValueFromAmount(e.GetModifiedFee())));
    info.push_back(Pair("time", e.GetTime()));
    info.push_back(Pair("height", (int)e.GetHeight()));
    info.push_back(Pair("descendantcount", e.GetCountWithDescendants()));
    info.push_back(Pair("descendantsize", e.GetSizeWithDescendants()));
    info.push_back(Pair("descendantfees", e.GetModFeesWithDescendants()));
    info.push_back(Pair("ancestorcount", e.GetCountWithAncestors()));
    info.push_back(Pair("ancestorsize", e.GetSizeWithAncestors()));
    info.push_back(Pair("ancestorfees", e.GetModFeesWithAncestors()));
    const CTransaction& tx = e.GetTx();
    std::set<std::string> setDepends;
    for (const CTxIn& txin : tx.vin)
    {
        if (mempool.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.push_back(Pair("depends", depends));
    info.push_back(Pair("instantlock", llmq::quorumInstantSendManager->IsLocked(tx.GetHash())));
}

UniValue mempoolToJSON(bool fVerbose)
{
    if (fVerbose)
    {
        LOCK(mempool.cs);
        UniValue o(UniValue::VOBJ);
        for (const CTxMemPoolEntry& e : mempool.mapTx)
        {
            const uint256& hash = e.GetTx().GetHash();
            UniValue info(UniValue::VOBJ);
            entryToJSON(info, e);
            o.push_back(Pair(hash.ToString(), info));
        }
        return o;
    }
    else
    {
        std::vector<uint256> vtxid;
        mempool.queryHashes(vtxid);

        UniValue a(UniValue::VARR);
        for (const uint256& hash : vtxid)
            a.push_back(hash.ToString());

        return a;
    }
}

UniValue getrawmempool(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() > 1)
        throw std::runtime_error(
            "getrawmempool ( verbose )\n"
            "\nReturns 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"
            "\nArguments:\n"
            "1. verbose (boolean, optional, default=false) True for a json object, false for array of transaction ids\n"
            "\nResult: (for verbose = false):\n"
            "[                     (json array of string)\n"
            "  \"transactionid\"     (string) The transaction id\n"
            "  ,...\n"
            "]\n"
            "\nResult: (for verbose = true):\n"
            "{                           (json object)\n"
            "  \"transactionid\" : {       (json object)\n"
            + EntryDescriptionString()
            + "  }, ...\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getrawmempool", "true")
            + HelpExampleRpc("getrawmempool", "true")
        );

    bool fVerbose = false;
    if (!request.params[0].isNull())
        fVerbose = request.params[0].get_bool();

    return mempoolToJSON(fVerbose);
}

UniValue getmempoolancestors(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2) {
        throw std::runtime_error(
            "getmempoolancestors txid (verbose)\n"
            "\nIf txid is in the mempool, returns all in-mempool ancestors.\n"
            "\nArguments:\n"
            "1. \"txid\"                 (string, required) The transaction id (must be in mempool)\n"
            "2. verbose                  (boolean, optional, default=false) True for a json object, false for array of transaction ids\n"
            "\nResult (for verbose=false):\n"
            "[                       (json array of strings)\n"
            "  \"transactionid\"           (string) The transaction id of an in-mempool ancestor transaction\n"
            "  ,...\n"
            "]\n"
            "\nResult (for verbose=true):\n"
            "{                           (json object)\n"
            "  \"transactionid\" : {       (json object)\n"
            + EntryDescriptionString()
            + "  }, ...\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getmempoolancestors", "\"mytxid\"")
            + HelpExampleRpc("getmempoolancestors", "\"mytxid\"")
            );
    }

    bool fVerbose = false;
    if (!request.params[1].isNull())
        fVerbose = request.params[1].get_bool();

    uint256 hash = ParseHashV(request.params[0], "parameter 1");

    LOCK(mempool.cs);

    CTxMemPool::txiter it = mempool.mapTx.find(hash);
    if (it == mempool.mapTx.end()) {
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Transaction not in mempool");
    }

    CTxMemPool::setEntries setAncestors;
    uint64_t noLimit = std::numeric_limits<uint64_t>::max();
    std::string dummy;
    mempool.CalculateMemPoolAncestors(*it, setAncestors, noLimit, noLimit, noLimit, noLimit, dummy, false);

    if (!fVerbose) {
        UniValue o(UniValue::VARR);
        for (CTxMemPool::txiter ancestorIt : setAncestors) {
            o.push_back(ancestorIt->GetTx().GetHash().ToString());
        }

        return o;
    } else {
        UniValue o(UniValue::VOBJ);
        for (CTxMemPool::txiter ancestorIt : setAncestors) {
            const CTxMemPoolEntry &e = *ancestorIt;
            const uint256& _hash = e.GetTx().GetHash();
            UniValue info(UniValue::VOBJ);
            entryToJSON(info, e);
            o.push_back(Pair(_hash.ToString(), info));
        }
        return o;
    }
}

UniValue getmempooldescendants(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2) {
        throw std::runtime_error(
            "getmempooldescendants txid (verbose)\n"
            "\nIf txid is in the mempool, returns all in-mempool descendants.\n"
            "\nArguments:\n"
            "1. \"txid\"                 (string, required) The transaction id (must be in mempool)\n"
            "2. verbose                  (boolean, optional, default=false) True for a json object, false for array of transaction ids\n"
            "\nResult (for verbose=false):\n"
            "[                       (json array of strings)\n"
            "  \"transactionid\"           (string) The transaction id of an in-mempool descendant transaction\n"
            "  ,...\n"
            "]\n"
            "\nResult (for verbose=true):\n"
            "{                           (json object)\n"
            "  \"transactionid\" : {       (json object)\n"
            + EntryDescriptionString()
            + "  }, ...\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getmempooldescendants", "\"mytxid\"")
            + HelpExampleRpc("getmempooldescendants", "\"mytxid\"")
            );
    }

    bool fVerbose = false;
    if (!request.params[1].isNull())
        fVerbose = request.params[1].get_bool();

    uint256 hash = ParseHashV(request.params[0], "parameter 1");

    LOCK(mempool.cs);

    CTxMemPool::txiter it = mempool.mapTx.find(hash);
    if (it == mempool.mapTx.end()) {
        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;
            const uint256& _hash = e.GetTx().GetHash();
            UniValue info(UniValue::VOBJ);
            entryToJSON(info, e);
            o.push_back(Pair(_hash.ToString(), info));
        }
        return o;
    }
}

UniValue getmempoolentry(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 1) {
        throw std::runtime_error(
            "getmempoolentry txid\n"
            "\nReturns mempool data for given transaction\n"
            "\nArguments:\n"
            "1. \"txid\"                   (string, required) The transaction id (must be in mempool)\n"
            "\nResult:\n"
            "{                           (json object)\n"
            + EntryDescriptionString()
            + "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getmempoolentry", "\"mytxid\"")
            + HelpExampleRpc("getmempoolentry", "\"mytxid\"")
        );
    }

    uint256 hash = ParseHashV(request.params[0], "parameter 1");

    LOCK(mempool.cs);

    CTxMemPool::txiter it = mempool.mapTx.find(hash);
    if (it == mempool.mapTx.end()) {
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Transaction not in mempool");
    }

    const CTxMemPoolEntry &e = *it;
    UniValue info(UniValue::VOBJ);
    entryToJSON(info, e);
    return info;
}

UniValue getblockhashes(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 2)
        throw std::runtime_error(
            "getblockhashes timestamp\n"
            "\nReturns array of hashes of blocks within the timestamp range provided.\n"
            "\nArguments:\n"
            "1. high         (numeric, required) The newer block timestamp\n"
            "2. low          (numeric, required) The older block timestamp\n"
            "\nResult:\n"
            "[\n"
            "  \"hash\"         (string) The block hash\n"
            "]\n"
            "\nExamples:\n"
            + HelpExampleCli("getblockhashes", "1231614698 1231024505")
            + HelpExampleRpc("getblockhashes", "1231614698, 1231024505")
        );

    unsigned int high = request.params[0].get_int();
    unsigned int low = request.params[1].get_int();
    std::vector<uint256> blockHashes;

    if (!GetTimestampIndex(high, low, blockHashes)) {
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "No information available for block hashes");
    }

    UniValue result(UniValue::VARR);
    for (std::vector<uint256>::const_iterator it=blockHashes.begin(); it!=blockHashes.end(); it++) {
        result.push_back(it->GetHex());
    }

    return result;
}

UniValue getblockhash(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 1)
        throw std::runtime_error(
            "getblockhash height\n"
            "\nReturns hash of block in best-block-chain at height provided.\n"
            "\nArguments:\n"
            "1. height         (numeric, required) The height index\n"
            "\nResult:\n"
            "\"hash\"         (string) The block hash\n"
            "\nExamples:\n"
            + HelpExampleCli("getblockhash", "1000")
            + HelpExampleRpc("getblockhash", "1000")
        );

    LOCK(cs_main);

    int nHeight = request.params[0].get_int();
    if (nHeight < 0 || nHeight > chainActive.Height())
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Block height out of range");

    CBlockIndex* pblockindex = chainActive[nHeight];
    return pblockindex->GetBlockHash().GetHex();
}

UniValue getblockheader(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
        throw std::runtime_error(
            "getblockheader \"hash\" ( verbose )\n"
            "\nIf verbose is false, returns a string that is serialized, hex-encoded data for blockheader 'hash'.\n"
            "If verbose is true, returns an Object with information about blockheader <hash>.\n"
            "\nArguments:\n"
            "1. \"hash\"          (string, required) The block hash\n"
            "2. verbose           (boolean, optional, default=true) true for a json object, false for the hex encoded data\n"
            "\nResult (for verbose = true):\n"
            "{\n"
            "  \"hash\" : \"hash\",     (string) the block hash (same as provided)\n"
            "  \"confirmations\" : n,   (numeric) The number of confirmations, or -1 if the block is not on the main chain\n"
            "  \"height\" : n,          (numeric) The block height or index\n"
            "  \"version\" : n,         (numeric) The block version\n"
            "  \"versionHex\" : \"00000000\", (string) The block version formatted in hexadecimal\n"
            "  \"merkleroot\" : \"xxxx\", (string) The merkle root\n"
            "  \"time\" : ttt,          (numeric) The block time in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"mediantime\" : ttt,    (numeric) The median block time in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"nonce\" : n,           (numeric) The nonce\n"
            "  \"bits\" : \"1d00ffff\", (string) The bits\n"
            "  \"difficulty\" : x.xxx,  (numeric) The difficulty\n"
            "  \"chainwork\" : \"0000...1f3\"     (string) Expected number of hashes required to produce the current chain (in hex)\n"
            "  \"previousblockhash\" : \"hash\",  (string) The hash of the previous block\n"
            "  \"nextblockhash\" : \"hash\",      (string) The hash of the next block\n"
            "}\n"
            "\nResult (for verbose=false):\n"
            "\"data\"             (string) A string that is serialized, hex-encoded data for block 'hash'.\n"
            "\nExamples:\n"
            + HelpExampleCli("getblockheader", "\"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\"")
            + HelpExampleRpc("getblockheader", "\"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\"")
        );

    LOCK(cs_main);

    std::string strHash = request.params[0].get_str();
    uint256 hash(uint256S(strHash));

    bool fVerbose = true;
    if (!request.params[1].isNull())
        fVerbose = request.params[1].get_bool();

    if (mapBlockIndex.count(hash) == 0)
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");

    CBlockIndex* pblockindex = mapBlockIndex[hash];

    if (!fVerbose)
    {
        CDataStream ssBlock(SER_NETWORK, PROTOCOL_VERSION);
        ssBlock << pblockindex->GetBlockHeader();
        std::string strHex = HexStr(ssBlock.begin(), ssBlock.end());
        return strHex;
    }

    return blockheaderToJSON(pblockindex);
}

UniValue getblockheaders(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 3)
        throw std::runtime_error(
            "getblockheaders \"hash\" ( count verbose )\n"
            "\nReturns an array of items with information about <count> blockheaders starting from <hash>.\n"
            "\nIf verbose is false, each item is a string that is serialized, hex-encoded data for a single blockheader.\n"
            "If verbose is true, each item is an Object with information about a single blockheader.\n"
            "\nArguments:\n"
            "1. \"hash\"          (string, required) The block hash\n"
            "2. count           (numeric, optional, default/max=" + strprintf("%s", MAX_HEADERS_RESULTS) +")\n"
            "3. verbose         (boolean, optional, default=true) true for a json object, false for the hex encoded data\n"
            "\nResult (for verbose = true):\n"
            "[ {\n"
            "  \"hash\" : \"hash\",               (string)  The block hash\n"
            "  \"confirmations\" : n,           (numeric) The number of confirmations, or -1 if the block is not on the main chain\n"
            "  \"height\" : n,                  (numeric) The block height or index\n"
            "  \"version\" : n,                 (numeric) The block version\n"
            "  \"merkleroot\" : \"xxxx\",         (string)  The merkle root\n"
            "  \"time\" : ttt,                  (numeric) The block time in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"mediantime\" : ttt,            (numeric) The median block time in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"nonce\" : n,                   (numeric) The nonce\n"
            "  \"bits\" : \"1d00ffff\",           (string)  The bits\n"
            "  \"difficulty\" : x.xxx,          (numeric) The difficulty\n"
            "  \"chainwork\" : \"0000...1f3\"     (string)  Expected number of hashes required to produce the current chain (in hex)\n"
            "  \"previousblockhash\" : \"hash\",  (string)  The hash of the previous block\n"
            "  \"nextblockhash\" : \"hash\",      (string)  The hash of the next block\n"
            "}, {\n"
            "       ...\n"
            "   },\n"
            "...\n"
            "]\n"
            "\nResult (for verbose=false):\n"
            "[\n"
            "  \"data\",                        (string)  A string that is serialized, hex-encoded data for block header.\n"
            "  ...\n"
            "]\n"
            "\nExamples:\n"
            + HelpExampleCli("getblockheaders", "\"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\" 2000")
            + HelpExampleRpc("getblockheaders", "\"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\" 2000")
        );

    LOCK(cs_main);

    std::string strHash = request.params[0].get_str();
    uint256 hash(uint256S(strHash));

    if (mapBlockIndex.count(hash) == 0)
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");

    int nCount = MAX_HEADERS_RESULTS;
    if (!request.params[1].isNull())
        nCount = request.params[1].get_int();

    if (nCount <= 0 || nCount > (int)MAX_HEADERS_RESULTS)
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Count is out of range");

    bool fVerbose = true;
    if (!request.params[2].isNull())
        fVerbose = request.params[2].get_bool();

    CBlockIndex* pblockindex = mapBlockIndex[hash];

    UniValue arrHeaders(UniValue::VARR);

    if (!fVerbose)
    {
        for (; pblockindex; pblockindex = chainActive.Next(pblockindex))
        {
            CDataStream ssBlock(SER_NETWORK, PROTOCOL_VERSION);
            ssBlock << pblockindex->GetBlockHeader();
            std::string strHex = HexStr(ssBlock.begin(), ssBlock.end());
            arrHeaders.push_back(strHex);
            if (--nCount <= 0)
                break;
        }
        return arrHeaders;
    }

    for (; pblockindex; pblockindex = chainActive.Next(pblockindex))
    {
        arrHeaders.push_back(blockheaderToJSON(pblockindex));
        if (--nCount <= 0)
            break;
    }

    return arrHeaders;
}

static CBlock GetBlockChecked(const CBlockIndex* pblockindex)
{
    CBlock block;
    if (fHavePruned && !(pblockindex->nStatus & BLOCK_HAVE_DATA) && pblockindex->nTx > 0) {
        throw JSONRPCError(RPC_MISC_ERROR, "Block not available (pruned data)");
    }

    if (!ReadBlockFromDisk(block, pblockindex, Params().GetConsensus())) {
        // Block not found on disk. This could be because we have the block
        // header in our index but don't have the block (for example if a
        // non-whitelisted node sends us an unrequested long chain of valid
        // blocks, we add the headers to our index, but don't accept the
        // block).
        throw JSONRPCError(RPC_MISC_ERROR, "Block not found on disk");
    }

    return block;
}


UniValue getmerkleblocks(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 3)
        throw std::runtime_error(
            "getmerkleblocks \"filter\" \"hash\" ( count )\n"
            "\nReturns an array of hex-encoded merkleblocks for <count> blocks starting from <hash> which match <filter>.\n"
            "\nArguments:\n"
            "1. \"filter\"        (string, required) The hex encoded bloom filter\n"
            "2. \"hash\"          (string, required) The block hash\n"
            "3. count           (numeric, optional, default/max=" + strprintf("%s", MAX_HEADERS_RESULTS) +")\n"
            "\nResult:\n"
            "[\n"
            "  \"data\",                        (string)  A string that is serialized, hex-encoded data for a merkleblock.\n"
            "  ...\n"
            "]\n"
            "\nExamples:\n"
            + HelpExampleCli("getmerkleblocks", "\"2303028005802040100040000008008400048141010000f8400420800080025004000004130000000000000001\" \"00000000007e1432d2af52e8463278bf556b55cf5049262f25634557e2e91202\" 2000")
            + HelpExampleRpc("getmerkleblocks", "\"2303028005802040100040000008008400048141010000f8400420800080025004000004130000000000000001\" \"00000000007e1432d2af52e8463278bf556b55cf5049262f25634557e2e91202\" 2000")
        );

    LOCK(cs_main);

    CBloomFilter filter;
    std::string strFilter = request.params[0].get_str();
    CDataStream ssBloomFilter(ParseHex(strFilter), SER_NETWORK, PROTOCOL_VERSION);
    ssBloomFilter >> filter;
    if (!filter.IsWithinSizeConstraints()) {
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Filter is not within size constraints");
    }
    filter.UpdateEmptyFull();

    std::string strHash = request.params[1].get_str();
    uint256 hash(uint256S(strHash));

    if (mapBlockIndex.count(hash) == 0) {
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
    }

    int nCount = MAX_HEADERS_RESULTS;
    if (!request.params[2].isNull())
        nCount = request.params[2].get_int();

    if (nCount <= 0 || nCount > (int)MAX_HEADERS_RESULTS) {
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Count is out of range");
    }

    CBlockIndex* pblockindex = mapBlockIndex[hash];
    CBlock block = GetBlockChecked(pblockindex);

    UniValue arrMerkleBlocks(UniValue::VARR);

    for (; pblockindex; pblockindex = chainActive.Next(pblockindex))
    {
        if (--nCount < 0) {
            break;
        }

        if (!ReadBlockFromDisk(block, pblockindex, Params().GetConsensus())) {
            // this shouldn't happen, we already checked pruning case earlier
            throw JSONRPCError(RPC_MISC_ERROR, "Block not found on disk");
        }

        CMerkleBlock merkleblock(block, filter);
        if (merkleblock.vMatchedTxn.empty()) {
            // ignore blocks that do not match the filter
            continue;
        }

        CDataStream ssMerkleBlock(SER_NETWORK, PROTOCOL_VERSION);
        ssMerkleBlock << merkleblock;
        std::string strHex = HexStr(ssMerkleBlock);
        arrMerkleBlocks.push_back(strHex);
    }
    return arrMerkleBlocks;
}

UniValue getblock(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 2)
        throw std::runtime_error(
            "getblock \"blockhash\" ( verbosity ) \n"
            "\nIf verbosity is 0, returns a string that is serialized, hex-encoded data for block 'hash'.\n"
            "If verbosity is 1, returns an Object with information about block <hash>.\n"
            "If verbosity is 2, returns an Object with information about block <hash> and information about each transaction. \n"
            "\nArguments:\n"
            "1. \"blockhash\"          (string, required) The block hash\n"
            "2. verbosity              (numeric, optional, default=1) 0 for hex-encoded data, 1 for a json object, and 2 for json object with transaction data\n"
            "\nResult (for verbosity = 0):\n"
            "\"data\"             (string) A string that is serialized, hex-encoded data for block 'hash'.\n"
            "\nResult (for verbose = 1):\n"
            "{\n"
            "  \"hash\" : \"hash\",     (string) the block hash (same as provided)\n"
            "  \"confirmations\" : n,   (numeric) The number of confirmations, or -1 if the block is not on the main chain\n"
            "  \"size\" : n,            (numeric) The block size\n"
            "  \"height\" : n,          (numeric) The block height or index\n"
            "  \"version\" : n,         (numeric) The block version\n"
            "  \"versionHex\" : \"00000000\", (string) The block version formatted in hexadecimal\n"
            "  \"merkleroot\" : \"xxxx\", (string) The merkle root\n"
            "  \"tx\" : [               (array of string) The transaction ids\n"
            "     \"transactionid\"     (string) The transaction id\n"
            "     ,...\n"
            "  ],\n"
            "  \"cbTx\" : {             (json object) The coinbase special transaction \n"
            "     \"version\"           (numeric) The coinbase special transaction version\n"
            "     \"height\"            (numeric) The block height\n"
            "     \"merkleRootMNList\" : \"xxxx\", (string) The merkle root of the masternode list\n"
            "     \"merkleRootQuorums\" : \"xxxx\", (string) The merkle root of the quorum list\n"
            "  },\n"
            "  \"time\" : ttt,          (numeric) The block time in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"mediantime\" : ttt,    (numeric) The median block time in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"nonce\" : n,           (numeric) The nonce\n"
            "  \"bits\" : \"1d00ffff\", (string) The bits\n"
            "  \"difficulty\" : x.xxx,  (numeric) The difficulty\n"
            "  \"chainwork\" : \"xxxx\",  (string) Expected number of hashes required to produce the chain up to this block (in hex)\n"
            "  \"previousblockhash\" : \"hash\",  (string) The hash of the previous block\n"
            "  \"nextblockhash\" : \"hash\"       (string) The hash of the next block\n"
            "}\n"
            "\nResult (for verbosity = 2):\n"
            "{\n"
            "  ...,                     Same output as verbosity = 1.\n"
            "  \"tx\" : [               (array of Objects) The transactions in the format of the getrawtransaction RPC. Different from verbosity = 1 \"tx\" result.\n"
            "         ,...\n"
            "  ],\n"
            "  ,...                     Same output as verbosity = 1.\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getblock", "\"00000000000fd08c2fb661d2fcb0d49abb3a91e5f27082ce64feed3b4dede2e2\"")
            + HelpExampleRpc("getblock", "\"00000000000fd08c2fb661d2fcb0d49abb3a91e5f27082ce64feed3b4dede2e2\"")
        );

    LOCK(cs_main);

    std::string strHash = request.params[0].get_str();
    uint256 hash(uint256S(strHash));

    int verbosity = 1;
    if (!request.params[1].isNull()) {
        if(request.params[1].isNum())
            verbosity = request.params[1].get_int();
        else
            verbosity = request.params[1].get_bool() ? 1 : 0;
    }

    if (mapBlockIndex.count(hash) == 0)
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");

    CBlockIndex* pblockindex = mapBlockIndex[hash];
    const CBlock block = GetBlockChecked(pblockindex);

    if (verbosity <= 0)
    {
        CDataStream ssBlock(SER_NETWORK, PROTOCOL_VERSION);
        ssBlock << block;
        std::string strHex = HexStr(ssBlock.begin(), ssBlock.end());
        return strHex;
    }

    return blockToJSON(block, pblockindex, verbosity >= 2);
}

struct CCoinsStats
{
    int nHeight;
    uint256 hashBlock;
    uint64_t nTransactions;
    uint64_t nTransactionOutputs;
    uint64_t nBogoSize;
    uint256 hashSerialized;
    uint64_t nDiskSize;
    CAmount nTotalAmount;

    CCoinsStats() : nHeight(0), nTransactions(0), nTransactionOutputs(0), nBogoSize(0), nDiskSize(0), nTotalAmount(0) {}
};

static void ApplyStats(CCoinsStats &stats, CHashWriter& ss, const uint256& hash, const std::map<uint32_t, Coin>& outputs)
{
    assert(!outputs.empty());
    ss << hash;
    ss << VARINT(outputs.begin()->second.nHeight * 2 + outputs.begin()->second.fCoinBase);
    stats.nTransactions++;
    for (const auto output : outputs) {
        ss << VARINT(output.first + 1);
        ss << output.second.out.scriptPubKey;
        ss << VARINT(output.second.out.nValue);
        stats.nTransactionOutputs++;
        stats.nTotalAmount += output.second.out.nValue;
        stats.nBogoSize += 32 /* txid */ + 4 /* vout index */ + 4 /* height + coinbase */ + 8 /* amount */ +
                           2 /* scriptPubKey len */ + output.second.out.scriptPubKey.size() /* scriptPubKey */;
    }
    ss << VARINT(0);
}

//! Calculate statistics about the unspent transaction output set
static bool GetUTXOStats(CCoinsView *view, CCoinsStats &stats)
{
    std::unique_ptr<CCoinsViewCursor> pcursor(view->Cursor());
    assert(pcursor);

    CHashWriter ss(SER_GETHASH, PROTOCOL_VERSION);
    stats.hashBlock = pcursor->GetBestBlock();
    {
        LOCK(cs_main);
        stats.nHeight = mapBlockIndex.find(stats.hashBlock)->second->nHeight;
    }
    ss << stats.hashBlock;
    uint256 prevkey;
    std::map<uint32_t, Coin> outputs;
    while (pcursor->Valid()) {
        boost::this_thread::interruption_point();
        COutPoint key;
        Coin coin;
        if (pcursor->GetKey(key) && pcursor->GetValue(coin)) {
            if (!outputs.empty() && key.hash != prevkey) {
                ApplyStats(stats, ss, prevkey, outputs);
                outputs.clear();
            }
            prevkey = key.hash;
            outputs[key.n] = std::move(coin);
        } else {
            return error("%s: unable to read value", __func__);
        }
        pcursor->Next();
    }
    if (!outputs.empty()) {
        ApplyStats(stats, ss, prevkey, outputs);
    }
    stats.hashSerialized = ss.GetHash();
    stats.nDiskSize = view->EstimateSize();
    return true;
}

UniValue pruneblockchain(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 1)
        throw std::runtime_error(
            "pruneblockchain\n"
            "\nArguments:\n"
            "1. \"height\"       (numeric, required) The block height to prune up to. May be set to a discrete height, or a unix timestamp\n"
            "                  to prune blocks whose block time is at least 2 hours older than the provided timestamp.\n"
            "\nResult:\n"
            "n    (numeric) Height of the last block pruned.\n"
            "\nExamples:\n"
            + HelpExampleCli("pruneblockchain", "1000")
            + HelpExampleRpc("pruneblockchain", "1000"));

    if (!fPruneMode)
        throw JSONRPCError(RPC_MISC_ERROR, "Cannot prune blocks because node is not in prune mode.");

    LOCK(cs_main);

    int heightParam = request.params[0].get_int();
    if (heightParam < 0)
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Negative block height.");

    // Height value more than a billion is too high to be a block height, and
    // too low to be a block time (corresponds to timestamp from Sep 2001).
    if (heightParam > 1000000000) {
        // Add a 2 hour buffer to include blocks which might have had old timestamps
        CBlockIndex* pindex = chainActive.FindEarliestAtLeast(heightParam - TIMESTAMP_WINDOW);
        if (!pindex) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Could not find block with at least the specified timestamp.");
        }
        heightParam = pindex->nHeight;
    }

    unsigned int height = (unsigned int) heightParam;
    unsigned int chainHeight = (unsigned int) chainActive.Height();
    if (chainHeight < Params().PruneAfterHeight())
        throw JSONRPCError(RPC_MISC_ERROR, "Blockchain is too short for pruning.");
    else if (height > chainHeight)
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Blockchain is shorter than the attempted prune height.");
    else if (height > chainHeight - MIN_BLOCKS_TO_KEEP) {
        LogPrint(BCLog::RPC, "Attempt to prune blocks close to the tip.  Retaining the minimum number of blocks.");
        height = chainHeight - MIN_BLOCKS_TO_KEEP;
    }

    PruneBlockFilesManual(height);
    return uint64_t(height);
}

UniValue gettxoutsetinfo(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
            "gettxoutsetinfo\n"
            "\nReturns statistics about the unspent transaction output set.\n"
            "Note this call may take some time.\n"
            "\nResult:\n"
            "{\n"
            "  \"height\":n,     (numeric) The current block height (index)\n"
            "  \"bestblock\": \"hex\",   (string) the best block hash hex\n"
            "  \"transactions\": n,      (numeric) The number of transactions\n"
            "  \"txouts\": n,            (numeric) The number of unspent transaction outputs\n"
            "  \"bogosize\": n,          (numeric) A meaningless metric for UTXO set size\n"
            "  \"hash_serialized_2\": \"hash\", (string) The serialized hash\n"
            "  \"disk_size\": n,         (numeric) The estimated size of the chainstate on disk\n"
            "  \"total_amount\": x.xxx          (numeric) The total amount\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("gettxoutsetinfo", "")
            + HelpExampleRpc("gettxoutsetinfo", "")
        );

    UniValue ret(UniValue::VOBJ);

    CCoinsStats stats;
    FlushStateToDisk();
    if (GetUTXOStats(pcoinsdbview, stats)) {
        ret.push_back(Pair("height", (int64_t)stats.nHeight));
        ret.push_back(Pair("bestblock", stats.hashBlock.GetHex()));
        ret.push_back(Pair("transactions", (int64_t)stats.nTransactions));
        ret.push_back(Pair("txouts", (int64_t)stats.nTransactionOutputs));
        ret.push_back(Pair("bogosize", (int64_t)stats.nBogoSize));
        ret.push_back(Pair("hash_serialized_2", stats.hashSerialized.GetHex()));
        ret.push_back(Pair("disk_size", stats.nDiskSize));
        ret.push_back(Pair("total_amount", ValueFromAmount(stats.nTotalAmount)));
    } else {
        throw JSONRPCError(RPC_INTERNAL_ERROR, "Unable to read UTXO set");
    }
    return ret;
}

UniValue gettxout(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 2 || request.params.size() > 3)
        throw std::runtime_error(
            "gettxout \"txid\" n ( include_mempool )\n"
            "\nReturns details about an unspent transaction output.\n"
            "\nArguments:\n"
            "1. \"txid\"             (string, required) The transaction id\n"
            "2. \"n\"                (numeric, required) vout number\n"
            "3. \"include_mempool\"  (boolean, optional) Whether to include the mempool. Default: true."
            "     Note that an unspent output that is spent in the mempool won't appear.\n"
            "\nResult:\n"
            "{\n"
            "  \"bestblock\" : \"hash\",    (string) the block hash\n"
            "  \"confirmations\" : n,       (numeric) The number of confirmations\n"
            "  \"value\" : x.xxx,           (numeric) The transaction value in " + CURRENCY_UNIT + "\n"
            "  \"scriptPubKey\" : {         (json object)\n"
            "     \"asm\" : \"code\",       (string) \n"
            "     \"hex\" : \"hex\",        (string) \n"
            "     \"reqSigs\" : n,          (numeric) Number of required signatures\n"
            "     \"type\" : \"pubkeyhash\", (string) The type, eg pubkeyhash\n"
            "     \"addresses\" : [          (array of string) array of dash addresses\n"
            "        \"address\"     (string) dash address\n"
            "        ,...\n"
            "     ]\n"
            "  },\n"
            "  \"coinbase\" : true|false   (boolean) Coinbase or not\n"
            "}\n"

            "\nExamples:\n"
            "\nGet unspent transactions\n"
            + HelpExampleCli("listunspent", "") +
            "\nView the details\n"
            + HelpExampleCli("gettxout", "\"txid\" 1") +
            "\nAs a json rpc call\n"
            + HelpExampleRpc("gettxout", "\"txid\", 1")
        );

    LOCK(cs_main);

    UniValue ret(UniValue::VOBJ);

    std::string strHash = request.params[0].get_str();
    uint256 hash(uint256S(strHash));
    int n = request.params[1].get_int();
    COutPoint out(hash, n);
    bool fMempool = true;
    if (!request.params[2].isNull())
        fMempool = request.params[2].get_bool();

    Coin coin;
    if (fMempool) {
        LOCK(mempool.cs);
        CCoinsViewMemPool view(pcoinsTip, mempool);
        if (!view.GetCoin(out, coin) || mempool.isSpent(out)) {
            return NullUniValue;
        }
    } else {
        if (!pcoinsTip->GetCoin(out, coin)) {
            return NullUniValue;
        }
    }

    BlockMap::iterator it = mapBlockIndex.find(pcoinsTip->GetBestBlock());
    CBlockIndex *pindex = it->second;
    ret.push_back(Pair("bestblock", pindex->GetBlockHash().GetHex()));
    if (coin.nHeight == MEMPOOL_HEIGHT) {
        ret.push_back(Pair("confirmations", 0));
    } else {
        ret.push_back(Pair("confirmations", (int64_t)(pindex->nHeight - coin.nHeight + 1)));
    }
    ret.push_back(Pair("value", ValueFromAmount(coin.out.nValue)));
    UniValue o(UniValue::VOBJ);
    ScriptPubKeyToUniv(coin.out.scriptPubKey, o, true);
    ret.push_back(Pair("scriptPubKey", o));
    ret.push_back(Pair("coinbase", (bool)coin.fCoinBase));

    return ret;
}

UniValue verifychain(const JSONRPCRequest& request)
{
    int nCheckLevel = gArgs.GetArg("-checklevel", DEFAULT_CHECKLEVEL);
    int nCheckDepth = gArgs.GetArg("-checkblocks", DEFAULT_CHECKBLOCKS);
    if (request.fHelp || request.params.size() > 2)
        throw std::runtime_error(
            "verifychain ( checklevel nblocks )\n"
            "\nVerifies blockchain database.\n"
            "\nArguments:\n"
            "1. checklevel   (numeric, optional, 0-4, default=" + strprintf("%d", nCheckLevel) + ") How thorough the block verification is.\n"
            "2. nblocks      (numeric, optional, default=" + strprintf("%d", nCheckDepth) + ", 0=all) The number of blocks to check.\n"
            "\nResult:\n"
            "true|false       (boolean) Verified or not\n"
            "\nExamples:\n"
            + HelpExampleCli("verifychain", "")
            + HelpExampleRpc("verifychain", "")
        );

    LOCK(cs_main);

    if (!request.params[0].isNull())
        nCheckLevel = request.params[0].get_int();
    if (!request.params[1].isNull())
        nCheckDepth = request.params[1].get_int();

    return CVerifyDB().VerifyDB(Params(), pcoinsTip, nCheckLevel, nCheckDepth);
}

/** Implementation of IsSuperMajority with better feedback */
static UniValue SoftForkMajorityDesc(int version, CBlockIndex* pindex, const Consensus::Params& consensusParams)
{
    UniValue rv(UniValue::VOBJ);
    bool activated = false;
    switch(version)
    {
        case 2:
            activated = pindex->nHeight >= consensusParams.BIP34Height;
            break;
        case 3:
            activated = pindex->nHeight >= consensusParams.BIP66Height;
            break;
        case 4:
            activated = pindex->nHeight >= consensusParams.BIP65Height;
            break;
    }
    rv.push_back(Pair("status", activated));
    return rv;
}

static UniValue SoftForkDesc(const std::string &name, int version, CBlockIndex* pindex, const Consensus::Params& consensusParams)
{
    UniValue rv(UniValue::VOBJ);
    rv.push_back(Pair("id", name));
    rv.push_back(Pair("version", version));
    rv.push_back(Pair("reject", SoftForkMajorityDesc(version, pindex, consensusParams)));
    return rv;
}

static UniValue BIP9SoftForkDesc(const Consensus::Params& consensusParams, Consensus::DeploymentPos id)
{
    UniValue rv(UniValue::VOBJ);
    const ThresholdState thresholdState = VersionBitsTipState(consensusParams, id);
    switch (thresholdState) {
    case THRESHOLD_DEFINED: rv.push_back(Pair("status", "defined")); break;
    case THRESHOLD_STARTED: rv.push_back(Pair("status", "started")); break;
    case THRESHOLD_LOCKED_IN: rv.push_back(Pair("status", "locked_in")); break;
    case THRESHOLD_ACTIVE: rv.push_back(Pair("status", "active")); break;
    case THRESHOLD_FAILED: rv.push_back(Pair("status", "failed")); break;
    }
    if (THRESHOLD_STARTED == thresholdState)
    {
        rv.push_back(Pair("bit", consensusParams.vDeployments[id].bit));
    }
    rv.push_back(Pair("startTime", consensusParams.vDeployments[id].nStartTime));
    rv.push_back(Pair("timeout", consensusParams.vDeployments[id].nTimeout));
    rv.push_back(Pair("since", VersionBitsTipStateSinceHeight(consensusParams, id)));
    if (THRESHOLD_STARTED == thresholdState)
    {
        UniValue statsUV(UniValue::VOBJ);
        BIP9Stats statsStruct = VersionBitsTipStatistics(consensusParams, id);
        statsUV.push_back(Pair("period", statsStruct.period));
        statsUV.push_back(Pair("threshold", statsStruct.threshold));
        statsUV.push_back(Pair("elapsed", statsStruct.elapsed));
        statsUV.push_back(Pair("count", statsStruct.count));
        statsUV.push_back(Pair("possible", statsStruct.possible));
        rv.push_back(Pair("statistics", statsUV));
    }
    return rv;
}

void BIP9SoftForkDescPushBack(UniValue& bip9_softforks, const std::string &name, const Consensus::Params& consensusParams, Consensus::DeploymentPos id)
{
    // Deployments with timeout value of 0 are hidden.
    // A timeout value of 0 guarantees a softfork will never be activated.
    // This is used when softfork codes are merged without specifying the deployment schedule.
    if (consensusParams.vDeployments[id].nTimeout > 0)
        bip9_softforks.push_back(Pair(name, BIP9SoftForkDesc(consensusParams, id)));
}

UniValue getblockchaininfo(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
            "getblockchaininfo\n"
            "Returns an object containing various state info regarding blockchain processing.\n"
            "\nResult:\n"
            "{\n"
            "  \"chain\": \"xxxx\",        (string) current network name as defined in BIP70 (main, test, regtest)\n"
            "  \"blocks\": xxxxxx,         (numeric) the current number of blocks processed in the server\n"
            "  \"headers\": xxxxxx,        (numeric) the current number of headers we have validated\n"
            "  \"bestblockhash\": \"...\", (string) the hash of the currently best block\n"
            "  \"difficulty\": xxxxxx,     (numeric) the current difficulty\n"
            "  \"mediantime\": xxxxxx,     (numeric) median time for the current best block\n"
            "  \"verificationprogress\": xxxx, (numeric) estimate of verification progress [0..1]\n"
            "  \"chainwork\": \"xxxx\"     (string) total amount of work in active chain, in hexadecimal\n"
            "  \"size_on_disk\": xxxxxx,   (numeric) the estimated size of the block and undo files on disk\n"
            "  \"pruned\": xx,             (boolean) if the blocks are subject to pruning\n"
            "  \"pruneheight\": xxxxxx,    (numeric) lowest-height complete block stored (only present if pruning is enabled)\n"
            "  \"automatic_pruning\": xx,  (boolean) whether automatic pruning is enabled (only present if pruning is enabled)\n"
            "  \"prune_target_size\": xxxxxx,  (numeric) the target size used by pruning (only present if automatic pruning is enabled)\n"
            "  \"softforks\": [            (array) status of softforks in progress\n"
            "     {\n"
            "        \"id\": \"xxxx\",        (string) name of softfork\n"
            "        \"version\": xx,         (numeric) block version\n"
            "        \"reject\": {            (object) progress toward rejecting pre-softfork blocks\n"
            "           \"status\": xx,       (boolean) true if threshold reached\n"
            "        },\n"
            "     }, ...\n"
            "  ],\n"
            "  \"bip9_softforks\": {          (object) status of BIP9 softforks in progress\n"
            "     \"xxxx\" : {                (string) name of the softfork\n"
            "        \"status\": \"xxxx\",    (string) one of \"defined\", \"started\", \"locked_in\", \"active\", \"failed\"\n"
            "        \"bit\": xx,             (numeric) the bit (0-28) in the block version field used to signal this softfork (only for \"started\" status)\n"
            "        \"startTime\": xx,       (numeric) the minimum median time past of a block at which the bit gains its meaning\n"
            "        \"timeout\": xx,         (numeric) the median time past of a block at which the deployment is considered failed if not yet locked in\n"
            "        \"since\": xx,           (numeric) height of the first block to which the status applies\n"
            "        \"statistics\": {        (object) numeric statistics about BIP9 signalling for a softfork (only for \"started\" status)\n"
            "           \"period\": xx,       (numeric) the length in blocks of the BIP9 signalling period \n"
            "           \"threshold\": xx,    (numeric) the number of blocks with the version bit set required to activate the feature \n"
            "           \"elapsed\": xx,      (numeric) the number of blocks elapsed since the beginning of the current period \n"
            "           \"count\": xx,        (numeric) the number of blocks with the version bit set in the current period \n"
            "           \"possible\": xx      (boolean) returns false if there are not enough blocks left in this period to pass activation threshold \n"
            "        }\n"
            "     }\n"
            "  }\n"
            "  \"warnings\" : \"...\",         (string) any network and blockchain warnings.\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getblockchaininfo", "")
            + HelpExampleRpc("getblockchaininfo", "")
        );

    LOCK(cs_main);

    UniValue obj(UniValue::VOBJ);
    obj.push_back(Pair("chain",                 Params().NetworkIDString()));
    obj.push_back(Pair("blocks",                (int)chainActive.Height()));
    obj.push_back(Pair("headers",               pindexBestHeader ? pindexBestHeader->nHeight : -1));
    obj.push_back(Pair("bestblockhash",         chainActive.Tip()->GetBlockHash().GetHex()));
    obj.push_back(Pair("difficulty",            (double)GetDifficulty()));
    obj.push_back(Pair("mediantime",            (int64_t)chainActive.Tip()->GetMedianTimePast()));
    obj.push_back(Pair("verificationprogress",  GuessVerificationProgress(Params().TxData(), chainActive.Tip())));
    obj.push_back(Pair("chainwork",             chainActive.Tip()->nChainWork.GetHex()));
    obj.push_back(Pair("size_on_disk",          CalculateCurrentUsage()));
    obj.push_back(Pair("pruned",                fPruneMode));
    if (fPruneMode) {
        CBlockIndex* block = chainActive.Tip();
        assert(block);
        while (block->pprev && (block->pprev->nStatus & BLOCK_HAVE_DATA)) {
            block = block->pprev;
        }

        obj.push_back(Pair("pruneheight",        block->nHeight));

        // if 0, execution bypasses the whole if block.
        bool automatic_pruning = (gArgs.GetArg("-prune", 0) != 1);
        obj.push_back(Pair("automatic_pruning",  automatic_pruning));
        if (automatic_pruning) {
            obj.push_back(Pair("prune_target_size",  nPruneTarget));
        }
    }

    const Consensus::Params& consensusParams = Params().GetConsensus();
    CBlockIndex* tip = chainActive.Tip();
    UniValue softforks(UniValue::VARR);
    UniValue bip9_softforks(UniValue::VOBJ);
    // sorted by activation block
    softforks.push_back(SoftForkDesc("bip34", 2, tip, consensusParams));
    softforks.push_back(SoftForkDesc("bip66", 3, tip, consensusParams));
    softforks.push_back(SoftForkDesc("bip65", 4, tip, consensusParams));
    // sorted by start time/bit
    BIP9SoftForkDescPushBack(bip9_softforks, "csv", consensusParams, Consensus::DEPLOYMENT_CSV);
    BIP9SoftForkDescPushBack(bip9_softforks, "dip0001", consensusParams, Consensus::DEPLOYMENT_DIP0001);
    BIP9SoftForkDescPushBack(bip9_softforks, "bip147", consensusParams, Consensus::DEPLOYMENT_BIP147);
    BIP9SoftForkDescPushBack(bip9_softforks, "dip0003", consensusParams, Consensus::DEPLOYMENT_DIP0003);
    BIP9SoftForkDescPushBack(bip9_softforks, "dip0008", consensusParams, Consensus::DEPLOYMENT_DIP0008);
    obj.push_back(Pair("softforks",             softforks));
    obj.push_back(Pair("bip9_softforks", bip9_softforks));

    obj.push_back(Pair("warnings", GetWarnings("statusbar")));
    return obj;
}

/** Comparison function for sorting the getchaintips heads.  */
struct CompareBlocksByHeight
{
    bool operator()(const CBlockIndex* a, const CBlockIndex* b) const
    {
        /* Make sure that unequal blocks with the same height do not compare
           equal. Use the pointers themselves to make a distinction. */

        if (a->nHeight != b->nHeight)
          return (a->nHeight > b->nHeight);

        return a < b;
    }
};

UniValue getchaintips(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() > 2)
        throw std::runtime_error(
            "getchaintips ( count branchlen )\n"
            "Return information about all known tips in the block tree,"
            " including the main chain as well as orphaned branches.\n"
            "\nArguments:\n"
            "1. count       (numeric, optional) only show this much of latest tips\n"
            "2. branchlen   (numeric, optional) only show tips that have equal or greater length of branch\n"
            "\nResult:\n"
            "[\n"
            "  {\n"
            "    \"height\": xxxx,             (numeric) height of the chain tip\n"
            "    \"hash\": \"xxxx\",             (string) block hash of the tip\n"
            "    \"difficulty\" : x.xxx,       (numeric) The difficulty\n"
            "    \"chainwork\" : \"0000...1f3\"  (string) Expected number of hashes required to produce the current chain (in hex)\n"
            "    \"branchlen\": 0              (numeric) zero for main chain\n"
            "    \"forkpoint\": \"xxxx\",        (string) same as \"hash\" for the main chain\n"
            "    \"status\": \"active\"          (string) \"active\" for the main chain\n"
            "  },\n"
            "  {\n"
            "    \"height\": xxxx,\n"
            "    \"hash\": \"xxxx\",\n"
            "    \"difficulty\" : x.xxx,\n"
            "    \"chainwork\" : \"0000...1f3\"\n"
            "    \"branchlen\": 1              (numeric) length of branch connecting the tip to the main chain\n"
            "    \"forkpoint\": \"xxxx\",        (string) block hash of the last common block between this tip and the main chain\n"
            "    \"status\": \"xxxx\"            (string) status of the chain (active, valid-fork, valid-headers, headers-only, invalid)\n"
            "  }\n"
            "]\n"
            "Possible values for status:\n"
            "1.  \"invalid\"               This branch contains at least one invalid block\n"
            "2.  \"headers-only\"          Not all blocks for this branch are available, but the headers are valid\n"
            "3.  \"valid-headers\"         All blocks are available for this branch, but they were never fully validated\n"
            "4.  \"valid-fork\"            This branch is not part of the active chain, but is fully validated\n"
            "5.  \"active\"                This is the tip of the active main chain, which is certainly valid\n"
            "\nExamples:\n"
            + HelpExampleCli("getchaintips", "")
            + HelpExampleRpc("getchaintips", "")
        );

    LOCK(cs_main);

    /*
     * Idea:  the set of chain tips is chainActive.tip, plus orphan blocks which do not have another orphan building off of them.
     * Algorithm:
     *  - Make one pass through mapBlockIndex, picking out the orphan blocks, and also storing a set of the orphan block's pprev pointers.
     *  - Iterate through the orphan blocks. If the block isn't pointed to by another orphan, it is a chain tip.
     *  - add chainActive.Tip()
     */
    std::set<const CBlockIndex*, CompareBlocksByHeight> setTips;
    std::set<const CBlockIndex*> setOrphans;
    std::set<const CBlockIndex*> setPrevs;

    for (const std::pair<const uint256, CBlockIndex*>& item : mapBlockIndex)
    {
        if (!chainActive.Contains(item.second)) {
            setOrphans.insert(item.second);
            setPrevs.insert(item.second->pprev);
        }
    }

    for (std::set<const CBlockIndex*>::iterator it = setOrphans.begin(); it != setOrphans.end(); ++it)
    {
        if (setPrevs.erase(*it) == 0) {
            setTips.insert(*it);
        }
    }

    // Always report the currently active tip.
    setTips.insert(chainActive.Tip());

    int nBranchMin = -1;
    int nCountMax = INT_MAX;

    if(!request.params[0].isNull())
        nCountMax = request.params[0].get_int();

    if(!request.params[1].isNull())
        nBranchMin = request.params[1].get_int();

    /* Construct the output array.  */
    UniValue res(UniValue::VARR);
    for (const CBlockIndex* block : setTips)
    {
        const CBlockIndex* pindexFork = chainActive.FindFork(block);
        const int branchLen = block->nHeight - pindexFork->nHeight;
        if(branchLen < nBranchMin) continue;

        if(nCountMax-- < 1) break;

        UniValue obj(UniValue::VOBJ);
        obj.push_back(Pair("height", block->nHeight));
        obj.push_back(Pair("hash", block->phashBlock->GetHex()));
        obj.push_back(Pair("difficulty", GetDifficulty(block)));
        obj.push_back(Pair("chainwork", block->nChainWork.GetHex()));
        obj.push_back(Pair("branchlen", branchLen));
        obj.push_back(Pair("forkpoint", pindexFork->phashBlock->GetHex()));

        std::string status;
        if (chainActive.Contains(block)) {
            // This block is part of the currently active chain.
            status = "active";
        } else if (block->nStatus & BLOCK_FAILED_MASK) {
            // This block or one of its ancestors is invalid.
            status = "invalid";
        } else if (block->nChainTx == 0) {
            // This block cannot be connected because full block data for it or one of its parents is missing.
            status = "headers-only";
        } else if (block->IsValid(BLOCK_VALID_SCRIPTS)) {
            // This block is fully validated, but no longer part of the active chain. It was probably the active block once, but was reorganized.
            status = "valid-fork";
        } else if (block->IsValid(BLOCK_VALID_TREE)) {
            // The headers for this block are valid, but it has not been validated. It was probably never part of the most-work chain.
            status = "valid-headers";
        } else {
            // No clue.
            status = "unknown";
        }
        obj.push_back(Pair("status", status));

        res.push_back(obj);
    }

    return res;
}

UniValue mempoolInfoToJSON()
{
    UniValue ret(UniValue::VOBJ);
    ret.push_back(Pair("size", (int64_t) mempool.size()));
    ret.push_back(Pair("bytes", (int64_t) mempool.GetTotalTxSize()));
    ret.push_back(Pair("usage", (int64_t) mempool.DynamicMemoryUsage()));
    size_t maxmempool = gArgs.GetArg("-maxmempool", DEFAULT_MAX_MEMPOOL_SIZE) * 1000000;
    ret.push_back(Pair("maxmempool", (int64_t) maxmempool));
    ret.push_back(Pair("mempoolminfee", ValueFromAmount(mempool.GetMinFee(maxmempool).GetFeePerK())));
    ret.push_back(Pair("instantsendlocks", (int64_t)llmq::quorumInstantSendManager->GetInstantSendLockCount()));

    return ret;
}

UniValue getmempoolinfo(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 0)
        throw std::runtime_error(
            "getmempoolinfo\n"
            "\nReturns details on the active state of the TX memory pool.\n"
            "\nResult:\n"
            "{\n"
            "  \"size\": xxxxx,               (numeric) Current tx count\n"
            "  \"bytes\": xxxxx,              (numeric) Sum of all tx sizes\n"
            "  \"usage\": xxxxx,              (numeric) Total memory usage for the mempool\n"
            "  \"maxmempool\": xxxxx,         (numeric) Maximum memory usage for the mempool\n"
            "  \"mempoolminfee\": xxxxx       (numeric) Minimum fee rate in " + CURRENCY_UNIT + "/kB for tx to be accepted\n"
            "  \"instantsendlocks\": xxxxx,   (numeric) Number of unconfirmed instant send locks\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getmempoolinfo", "")
            + HelpExampleRpc("getmempoolinfo", "")
        );

    return mempoolInfoToJSON();
}

UniValue preciousblock(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 1)
        throw std::runtime_error(
            "preciousblock \"blockhash\"\n"
            "\nTreats a block as if it were received before others with the same work.\n"
            "\nA later preciousblock call can override the effect of an earlier one.\n"
            "\nThe effects of preciousblock are not retained across restarts.\n"
            "\nArguments:\n"
            "1. \"blockhash\"   (string, required) the hash of the block to mark as precious\n"
            "\nResult:\n"
            "\nExamples:\n"
            + HelpExampleCli("preciousblock", "\"blockhash\"")
            + HelpExampleRpc("preciousblock", "\"blockhash\"")
        );

    std::string strHash = request.params[0].get_str();
    uint256 hash(uint256S(strHash));
    CBlockIndex* pblockindex;

    {
        LOCK(cs_main);
        if (mapBlockIndex.count(hash) == 0)
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");

        pblockindex = mapBlockIndex[hash];
    }

    CValidationState state;
    PreciousBlock(state, Params(), pblockindex);

    if (!state.IsValid()) {
        throw JSONRPCError(RPC_DATABASE_ERROR, state.GetRejectReason());
    }

    return NullUniValue;
}

UniValue invalidateblock(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 1)
        throw std::runtime_error(
            "invalidateblock \"blockhash\"\n"
            "\nPermanently marks a block as invalid, as if it violated a consensus rule.\n"
            "\nArguments:\n"
            "1. \"blockhash\"   (string, required) the hash of the block to mark as invalid\n"
            "\nResult:\n"
            "\nExamples:\n"
            + HelpExampleCli("invalidateblock", "\"blockhash\"")
            + HelpExampleRpc("invalidateblock", "\"blockhash\"")
        );

    std::string strHash = request.params[0].get_str();
    uint256 hash(uint256S(strHash));
    CValidationState state;

    {
        LOCK(cs_main);
        if (mapBlockIndex.count(hash) == 0)
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");

        CBlockIndex* pblockindex = mapBlockIndex[hash];
        InvalidateBlock(state, Params(), pblockindex);
    }

    if (state.IsValid()) {
        ActivateBestChain(state, Params());
    }

    if (!state.IsValid()) {
        throw JSONRPCError(RPC_DATABASE_ERROR, state.GetRejectReason());
    }

    return NullUniValue;
}

UniValue reconsiderblock(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 1)
        throw std::runtime_error(
            "reconsiderblock \"blockhash\"\n"
            "\nRemoves invalidity status of a block and its descendants, reconsider them for activation.\n"
            "This can be used to undo the effects of invalidateblock.\n"
            "\nArguments:\n"
            "1. \"blockhash\"   (string, required) the hash of the block to reconsider\n"
            "\nResult:\n"
            "\nExamples:\n"
            + HelpExampleCli("reconsiderblock", "\"blockhash\"")
            + HelpExampleRpc("reconsiderblock", "\"blockhash\"")
        );

    std::string strHash = request.params[0].get_str();
    uint256 hash(uint256S(strHash));

    {
        LOCK(cs_main);
        if (mapBlockIndex.count(hash) == 0)
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");

        CBlockIndex* pblockindex = mapBlockIndex[hash];
        ResetBlockFailureFlags(pblockindex);
    }

    CValidationState state;
    ActivateBestChain(state, Params());

    if (!state.IsValid()) {
        throw JSONRPCError(RPC_DATABASE_ERROR, state.GetRejectReason());
    }

    return NullUniValue;
}

UniValue getchaintxstats(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() > 2)
        throw std::runtime_error(
            "getchaintxstats ( nblocks blockhash )\n"
            "\nCompute statistics about the total number and rate of transactions in the chain.\n"
            "\nArguments:\n"
            "1. nblocks      (numeric, optional) Size of the window in number of blocks (default: one month).\n"
            "2. \"blockhash\"  (string, optional) The hash of the block that ends the window.\n"
            "\nResult:\n"
            "{\n"
            "  \"time\": xxxxx,                (numeric) The timestamp for the final block in the window in UNIX format.\n"
            "  \"txcount\": xxxxx,             (numeric) The total number of transactions in the chain up to that point.\n"
            "  \"window_block_count\": xxxxx,  (numeric) Size of the window in number of blocks.\n"
            "  \"window_tx_count\": xxxxx,     (numeric) The number of transactions in the window. Only returned if \"window_block_count\" is > 0.\n"
            "  \"window_interval\": xxxxx,     (numeric) The elapsed time in the window in seconds. Only returned if \"window_block_count\" is > 0.\n"
            "  \"txrate\": x.xx,               (numeric) The average rate of transactions per second in the window. Only returned if \"window_interval\" is > 0.\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getchaintxstats", "")
            + HelpExampleRpc("getchaintxstats", "2016")
        );

    const CBlockIndex* pindex;
    int blockcount = 30 * 24 * 60 * 60 / Params().GetConsensus().nPowTargetSpacing; // By default: 1 month

    bool havehash = !request.params[1].isNull();
    uint256 hash;
    if (havehash) {
        hash = uint256S(request.params[1].get_str());
    }

    {
        LOCK(cs_main);
        if (havehash) {
            auto it = mapBlockIndex.find(hash);
            if (it == mapBlockIndex.end()) {
                throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
            }
            pindex = it->second;
            if (!chainActive.Contains(pindex)) {
                throw JSONRPCError(RPC_INVALID_PARAMETER, "Block is not in main chain");
            }
        } else {
            pindex = chainActive.Tip();
        }
    }
    
    assert(pindex != nullptr);

    if (request.params[0].isNull()) {
        blockcount = std::max(0, std::min(blockcount, pindex->nHeight - 1));
    } else {
        blockcount = request.params[0].get_int();

        if (blockcount < 0 || (blockcount > 0 && blockcount >= pindex->nHeight)) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid block count: should be between 0 and the block's height - 1");
        }
    }

    const CBlockIndex* pindexPast = pindex->GetAncestor(pindex->nHeight - blockcount);
    int nTimeDiff = pindex->GetMedianTimePast() - pindexPast->GetMedianTimePast();
    int nTxDiff = pindex->nChainTx - pindexPast->nChainTx;

    UniValue ret(UniValue::VOBJ);
    ret.push_back(Pair("time", (int64_t)pindex->nTime));
    ret.push_back(Pair("txcount", (int64_t)pindex->nChainTx));
    ret.push_back(Pair("window_block_count", blockcount));
    if (blockcount > 0) {
        ret.push_back(Pair("window_tx_count", nTxDiff));
        ret.push_back(Pair("window_interval", nTimeDiff));
        if (nTimeDiff > 0) {
            ret.push_back(Pair("txrate", ((double)nTxDiff) / nTimeDiff));
        }
    }

    return ret;
}

template<typename T>
static T CalculateTruncatedMedian(std::vector<T>& scores)
{
    size_t size = scores.size();
    if (size == 0) {
        return 0;
    }

    std::sort(scores.begin(), scores.end());
    if (size % 2 == 0) {
        return (scores[size / 2 - 1] + scores[size / 2]) / 2;
    } else {
        return scores[size / 2];
    }
}

template<typename T>
static inline bool SetHasKeys(const std::set<T>& set) {return false;}
template<typename T, typename Tk, typename... Args>
static inline bool SetHasKeys(const std::set<T>& set, const Tk& key, const Args&... args)
{
    return (set.count(key) != 0) || SetHasKeys(set, args...);
}

// outpoint (needed for the utxo index) + nHeight + fCoinBase
static constexpr size_t PER_UTXO_OVERHEAD = sizeof(COutPoint) + sizeof(uint32_t) + sizeof(bool);

static UniValue getblockstats(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 4) {
        throw std::runtime_error(
            "getblockstats hash_or_height ( stats )\n"
            "\nCompute per block statistics for a given window. All amounts are in duffs.\n"
            "It won't work for some heights with pruning.\n"
            "It won't work without -txindex for utxo_size_inc, *fee or *feerate stats.\n"
            "\nArguments:\n"
            "1. \"hash_or_height\"     (string or numeric, required) The block hash or height of the target block\n"
            "2. \"stats\"              (array,  optional) Values to plot, by default all values (see result below)\n"
            "    [\n"
            "      \"height\",         (string, optional) Selected statistic\n"
            "      \"time\",           (string, optional) Selected statistic\n"
            "      ,...\n"
            "    ]\n"
            "\nResult:\n"
            "{                           (json object)\n"
            "  \"avgfee\": xxxxx,          (numeric) Average fee in the block\n"
            "  \"avgfeerate\": xxxxx,      (numeric) Average feerate (in duffs per byte)\n"
            "  \"avgtxsize\": xxxxx,       (numeric) Average transaction size\n"
            "  \"blockhash\": xxxxx,       (string) The block hash (to check for potential reorgs)\n"
            "  \"height\": xxxxx,          (numeric) The height of the block\n"
            "  \"ins\": xxxxx,             (numeric) The number of inputs (excluding coinbase)\n"
            "  \"maxfee\": xxxxx,          (numeric) Maximum fee in the block\n"
            "  \"maxfeerate\": xxxxx,      (numeric) Maximum feerate (in duffs per byte)\n"
            "  \"maxtxsize\": xxxxx,       (numeric) Maximum transaction size\n"
            "  \"medianfee\": xxxxx,       (numeric) Truncated median fee in the block\n"
            "  \"medianfeerate\": xxxxx,   (numeric) Truncated median feerate (in duffs per byte)\n"
            "  \"mediantime\": xxxxx,      (numeric) The block median time past\n"
            "  \"mediantxsize\": xxxxx,    (numeric) Truncated median transaction size\n"
            "  \"minfee\": xxxxx,          (numeric) Minimum fee in the block\n"
            "  \"minfeerate\": xxxxx,      (numeric) Minimum feerate (in duffs per byte)\n"
            "  \"mintxsize\": xxxxx,       (numeric) Minimum transaction size\n"
            "  \"outs\": xxxxx,            (numeric) The number of outputs\n"
            "  \"subsidy\": xxxxx,         (numeric) The block subsidy\n"
            "  \"time\": xxxxx,            (numeric) The block time\n"
            "  \"total_out\": xxxxx,       (numeric) Total amount in all outputs (excluding coinbase and thus reward [ie subsidy + totalfee])\n"
            "  \"total_size\": xxxxx,      (numeric) Total size of all non-coinbase transactions\n"
            "  \"totalfee\": xxxxx,        (numeric) The fee total\n"
            "  \"txs\": xxxxx,             (numeric) The number of transactions (excluding coinbase)\n"
            "  \"utxo_increase\": xxxxx,   (numeric) The increase/decrease in the number of unspent outputs\n"
            "  \"utxo_size_inc\": xxxxx,   (numeric) The increase/decrease in size for the utxo index (not discounting op_return and similar)\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getblockstats", "1000 '[\"minfeerate\",\"avgfeerate\"]'")
            + HelpExampleRpc("getblockstats", "1000 '[\"minfeerate\",\"avgfeerate\"]'")
        );
    }

    LOCK(cs_main);

    CBlockIndex* pindex;
    if (request.params[0].isNum()) {
        const int height = request.params[0].get_int();
        const int current_tip = chainActive.Height();
        if (height < 0) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Target block height %d is negative", height));
        }
        if (height > current_tip) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Target block height %d after current tip %d", height, current_tip));
        }

        pindex = chainActive[height];
    } else {
        const uint256 hash = ParseHashV(request.params[0], "parameter 1");
        if (mapBlockIndex.count(hash) == 0)
            throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
        pindex = mapBlockIndex[hash];
        // pindex = LookupBlockIndex(hash);
        // if (!pindex) {
        //     throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
        // }
        if (!chainActive.Contains(pindex)) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Block is not in chain %s", Params().NetworkIDString()));
        }
    }

    assert(pindex != nullptr);

    std::set<std::string> stats;
    if (!request.params[1].isNull()) {
        const UniValue stats_univalue = request.params[1].get_array();
        for (unsigned int i = 0; i < stats_univalue.size(); i++) {
            const std::string stat = stats_univalue[i].get_str();
            stats.insert(stat);
        }
    }

    const CBlock block = GetBlockChecked(pindex);

    const bool do_all = stats.size() == 0; // Calculate everything if nothing selected (default)
    const bool do_mediantxsize = do_all || stats.count("mediantxsize") != 0;
    const bool do_medianfee = do_all || stats.count("medianfee") != 0;
    const bool do_medianfeerate = do_all || stats.count("medianfeerate") != 0;
    const bool loop_inputs = do_all || do_medianfee || do_medianfeerate ||
        SetHasKeys(stats, "utxo_size_inc", "totalfee", "avgfee", "avgfeerate", "minfee", "maxfee", "minfeerate", "maxfeerate");
    const bool loop_outputs = do_all || loop_inputs || stats.count("total_out");
    const bool do_calculate_size = do_all || do_mediantxsize ||
        SetHasKeys(stats, "total_size", "avgtxsize", "mintxsize", "maxtxsize", "avgfeerate", "medianfeerate", "minfeerate", "maxfeerate");

    CAmount maxfee = 0;
    CAmount maxfeerate = 0;
    CAmount minfee = MAX_MONEY;
    CAmount minfeerate = MAX_MONEY;
    CAmount total_out = 0;
    CAmount totalfee = 0;
    int64_t inputs = 0;
    int64_t maxtxsize = 0;
    int64_t mintxsize = MaxBlockSize(true);
    int64_t outputs = 0;
    int64_t total_size = 0;
    int64_t utxo_size_inc = 0;
    std::vector<CAmount> fee_array;
    std::vector<CAmount> feerate_array;
    std::vector<int64_t> txsize_array;

    for (const auto& tx : block.vtx) {
        outputs += tx->vout.size();

        CAmount tx_total_out = 0;
        if (loop_outputs) {
            for (const CTxOut& out : tx->vout) {
                tx_total_out += out.nValue;
                utxo_size_inc += GetSerializeSize(out, SER_NETWORK, PROTOCOL_VERSION) + PER_UTXO_OVERHEAD;
            }
        }

        if (tx->IsCoinBase()) {
            continue;
        }

        inputs += tx->vin.size(); // Don't count coinbase's fake input
        total_out += tx_total_out; // Don't count coinbase reward

        int64_t tx_size = 0;
        if (do_calculate_size) {

            tx_size = tx->GetTotalSize();
            if (do_mediantxsize) {
                txsize_array.push_back(tx_size);
            }
            maxtxsize = std::max(maxtxsize, tx_size);
            mintxsize = std::min(mintxsize, tx_size);
            total_size += tx_size;
        }

        if (loop_inputs) {

            if (!fTxIndex) {
                throw JSONRPCError(RPC_INVALID_PARAMETER, "One or more of the selected stats requires -txindex enabled");
            }
            CAmount tx_total_in = 0;
            for (const CTxIn& in : tx->vin) {
                CTransactionRef tx_in;
                uint256 hashBlock;
                if (!GetTransaction(in.prevout.hash, tx_in, Params().GetConsensus(), hashBlock, false)) {
                    throw JSONRPCError(RPC_INTERNAL_ERROR, std::string("Unexpected internal error (tx index seems corrupt)"));
                }

                CTxOut prevoutput = tx_in->vout[in.prevout.n];

                tx_total_in += prevoutput.nValue;
                utxo_size_inc -= GetSerializeSize(prevoutput, SER_NETWORK, PROTOCOL_VERSION) + PER_UTXO_OVERHEAD;
            }

            CAmount txfee = tx_total_in - tx_total_out;
            assert(MoneyRange(txfee));
            if (do_medianfee) {
                fee_array.push_back(txfee);
            }
            maxfee = std::max(maxfee, txfee);
            minfee = std::min(minfee, txfee);
            totalfee += txfee;

            CAmount feerate = tx_size ? txfee / tx_size : 0;
            if (do_medianfeerate) {
                feerate_array.push_back(feerate);
            }
            maxfeerate = std::max(maxfeerate, feerate);
            minfeerate = std::min(minfeerate, feerate);
        }
    }

    UniValue ret_all(UniValue::VOBJ);
    ret_all.pushKV("avgfee", (block.vtx.size() > 1) ? totalfee / (block.vtx.size() - 1) : 0);
    ret_all.pushKV("avgfeerate", total_size ? totalfee / total_size : 0); // Unit: sat/byte
    ret_all.pushKV("avgtxsize", (block.vtx.size() > 1) ? total_size / (block.vtx.size() - 1) : 0);
    ret_all.pushKV("blockhash", pindex->GetBlockHash().GetHex());
    ret_all.pushKV("height", (int64_t)pindex->nHeight);
    ret_all.pushKV("ins", inputs);
    ret_all.pushKV("maxfee", maxfee);
    ret_all.pushKV("maxfeerate", maxfeerate);
    ret_all.pushKV("maxtxsize", maxtxsize);
    ret_all.pushKV("medianfee", CalculateTruncatedMedian(fee_array));
    ret_all.pushKV("medianfeerate", CalculateTruncatedMedian(feerate_array));
    ret_all.pushKV("mediantime", pindex->GetMedianTimePast());
    ret_all.pushKV("mediantxsize", CalculateTruncatedMedian(txsize_array));
    ret_all.pushKV("minfee", (minfee == MAX_MONEY) ? 0 : minfee);
    ret_all.pushKV("minfeerate", (minfeerate == MAX_MONEY) ? 0 : minfeerate);
    ret_all.pushKV("mintxsize", mintxsize == MaxBlockSize(true) ? 0 : mintxsize);
    ret_all.pushKV("outs", outputs);
    ret_all.pushKV("subsidy", pindex->pprev ? GetBlockSubsidy(pindex->pprev->nBits, pindex->pprev->nHeight, Params().GetConsensus()) : 50 * COIN);
    ret_all.pushKV("time", pindex->GetBlockTime());
    ret_all.pushKV("total_out", total_out);
    ret_all.pushKV("total_size", total_size);
    ret_all.pushKV("totalfee", totalfee);
    ret_all.pushKV("txs", (int64_t)block.vtx.size());
    ret_all.pushKV("utxo_increase", outputs - inputs);
    ret_all.pushKV("utxo_size_inc", utxo_size_inc);

    if (do_all) {
        return ret_all;
    }

    UniValue ret(UniValue::VOBJ);
    for (const std::string& stat : stats) {
        const UniValue& value = ret_all[stat];
        if (value.isNull()) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid selected statistic %s", stat));
        }
        ret.pushKV(stat, value);
    }
    return ret;
}

UniValue getspecialtxes(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() < 1 || request.params.size() > 5)
        throw std::runtime_error(
            "getspecialtxes \"blockhash\" ( type count skip verbosity ) \n"
            "Returns an array of special transactions found in the specified block\n"
            "\nIf verbosity is 0, returns tx hash for each transaction.\n"
            "If verbosity is 1, returns hex-encoded data for each transaction.\n"
            "If verbosity is 2, returns an Object with information for each transaction.\n"
            "\nArguments:\n"
            "1. \"blockhash\"          (string, required) The block hash\n"
            "2. type                 (numeric, optional, default=-1) Filter special txes by type, -1 means all types\n"
            "3. count                (numeric, optional, default=10) The number of transactions to return\n"
            "4. skip                 (numeric, optional, default=0) The number of transactions to skip\n"
            "5. verbosity            (numeric, optional, default=0) 0 for hashes, 1 for hex-encoded data, and 2 for json object\n"
            "\nResult (for verbosity = 0):\n"
            "[\n"
            "  \"txid\" : \"xxxx\",    (string) The transaction id\n"
            "]\n"
            "\nResult (for verbosity = 1):\n"
            "[\n"
            "  \"data\",               (string) A string that is serialized, hex-encoded data for the transaction\n"
            "]\n"
            "\nResult (for verbosity = 2):\n"
            "[                       (array of Objects) The transactions in the format of the getrawtransaction RPC.\n"
            "  ...,\n"
            "]\n"
            "\nExamples:\n"
            + HelpExampleCli("getspecialtxes", "\"00000000000fd08c2fb661d2fcb0d49abb3a91e5f27082ce64feed3b4dede2e2\"")
            + HelpExampleRpc("getspecialtxes", "\"00000000000fd08c2fb661d2fcb0d49abb3a91e5f27082ce64feed3b4dede2e2\"")
        );

    LOCK(cs_main);

    std::string strHash = request.params[0].get_str();
    uint256 hash(uint256S(strHash));

    int nTxType = -1;
    if (!request.params[1].isNull()) {
        nTxType = request.params[1].get_int();
    }

    int nCount = 10;
    if (!request.params[2].isNull()) {
        nCount = request.params[2].get_int();
        if (nCount < 0)
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Negative count");
    }

    int nSkip = 0;
    if (!request.params[3].isNull()) {
        nSkip = request.params[3].get_int();
        if (nSkip < 0)
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Negative skip");
    }

    int nVerbosity = 0;
    if (!request.params[4].isNull()) {
        nVerbosity = request.params[4].get_int();
        if (nVerbosity < 0 || nVerbosity > 2) {
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Verbosity must be in range 0..2");
        }
    }

    if (mapBlockIndex.count(hash) == 0)
        throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");

    CBlockIndex* pblockindex = mapBlockIndex[hash];
    const CBlock block = GetBlockChecked(pblockindex);

    int nTxNum = 0;
    UniValue result(UniValue::VARR);
    for(const auto& tx : block.vtx)
    {
        if (tx->nVersion != 3 || tx->nType == TRANSACTION_NORMAL // ensure it's in fact a special tx
            || (nTxType != -1 && tx->nType != nTxType)) { // ensure special tx type matches filter, if given
                continue;
        }

        nTxNum++;
        if (nTxNum <= nSkip) continue;
        if (nTxNum > nSkip + nCount) break;

        switch (nVerbosity)
        {
            case 0 : result.push_back(tx->GetHash().GetHex()); break;
            case 1 : result.push_back(EncodeHexTx(*tx)); break;
            case 2 :
                {
                    UniValue objTx(UniValue::VOBJ);
                    TxToJSON(*tx, uint256(), objTx);
                    result.push_back(objTx);
                    break;
                }
            default : throw JSONRPCError(RPC_INTERNAL_ERROR, "Unsupported verbosity");
        }
    }

    return result;
}

UniValue savemempool(const JSONRPCRequest& request)
{
    if (request.fHelp || request.params.size() != 0) {
        throw std::runtime_error(
            "savemempool\n"
            "\nDumps the mempool to disk.\n"
            "\nExamples:\n"
            + HelpExampleCli("savemempool", "")
            + HelpExampleRpc("savemempool", "")
        );
    }

    if (!DumpMempool()) {
        throw JSONRPCError(RPC_MISC_ERROR, "Unable to dump mempool to disk");
    }

    return NullUniValue;
}

static const CRPCCommand commands[] =
{ //  category              name                      actor (function)         argNames
  //  --------------------- ------------------------  -----------------------  ----------
    { "blockchain",         "getblockchaininfo",      &getblockchaininfo,      {} },
    { "blockchain",         "getchaintxstats",        &getchaintxstats,        {"nblocks", "blockhash"} },
    { "blockchain",         "getblockstats",          &getblockstats,          {"hash_or_height", "stats"} },
    { "blockchain",         "getbestblockhash",       &getbestblockhash,       {} },
    { "blockchain",         "getbestchainlock",       &getbestchainlock,       {} },
    { "blockchain",         "getblockcount",          &getblockcount,          {} },
    { "blockchain",         "getblock",               &getblock,               {"blockhash","verbosity|verbose"} },
    { "blockchain",         "getblockhashes",         &getblockhashes,         {"high","low"} },
    { "blockchain",         "getblockhash",           &getblockhash,           {"height"} },
    { "blockchain",         "getblockheader",         &getblockheader,         {"blockhash","verbose"} },
    { "blockchain",         "getblockheaders",        &getblockheaders,        {"blockhash","count","verbose"} },
    { "blockchain",         "getmerkleblocks",        &getmerkleblocks,        {"filter","blockhash","count"} },
    { "blockchain",         "getchaintips",           &getchaintips,           {"count","branchlen"} },
    { "blockchain",         "getdifficulty",          &getdifficulty,          {} },
    { "blockchain",         "getmempoolancestors",    &getmempoolancestors,    {"txid","verbose"} },
    { "blockchain",         "getmempooldescendants",  &getmempooldescendants,  {"txid","verbose"} },
    { "blockchain",         "getmempoolentry",        &getmempoolentry,        {"txid"} },
    { "blockchain",         "getmempoolinfo",         &getmempoolinfo,         {} },
    { "blockchain",         "getrawmempool",          &getrawmempool,          {"verbose"} },
    { "blockchain",         "getspecialtxes",         &getspecialtxes,         {"blockhash", "type", "count", "skip", "verbosity"} },
    { "blockchain",         "gettxout",               &gettxout,               {"txid","n","include_mempool"} },
    { "blockchain",         "gettxoutsetinfo",        &gettxoutsetinfo,        {} },
    { "blockchain",         "pruneblockchain",        &pruneblockchain,        {"height"} },
    { "blockchain",         "savemempool",            &savemempool,            {} },
    { "blockchain",         "verifychain",            &verifychain,            {"checklevel","nblocks"} },

    { "blockchain",         "preciousblock",          &preciousblock,          {"blockhash"} },

    /* Not shown in help */
    { "hidden",             "invalidateblock",        &invalidateblock,        {"blockhash"} },
    { "hidden",             "reconsiderblock",        &reconsiderblock,        {"blockhash"} },
    { "hidden",             "waitfornewblock",        &waitfornewblock,        {"timeout"} },
    { "hidden",             "waitforblock",           &waitforblock,           {"blockhash","timeout"} },
    { "hidden",             "waitforblockheight",     &waitforblockheight,     {"height","timeout"} },
};

void RegisterBlockchainRPCCommands(CRPCTable &t)
{
    for (unsigned int vcidx = 0; vcidx < ARRAYLEN(commands); vcidx++)
        t.appendCommand(commands[vcidx].name, &commands[vcidx]);
}