text: // Copyright (c) 2010 Satoshi Nakamoto
  // Copyright (c) 2009-2014 The Bitcoin developers
  // Copyright (c) 2014-2015 The Dash developers
  // Copyright (c) 2015-2018 The PIVX developers
  // Copyright (c) 2018 The BITALLEY developers
  // Distributed under the MIT software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include "base58.h"
  #include "checkpoints.h"
  #include "clientversion.h"
  #include "main.h"
  #include "rpcserver.h"
  #include "sync.h"
  #include "txdb.h"
  #include "util.h"
  #include "utilmoneystr.h"
  #include "accumulatormap.h"
  #include "accumulators.h"
  
  #include <stdint.h>
  #include <univalue.h>
  
  using namespace std;
  
  extern void TxToJSON(const CTransaction& tx, const uint256 hashBlock, UniValue& entry);
  void ScriptPubKeyToJSON(const CScript& scriptPubKey, UniValue& out, bool fIncludeHex);
  
  double GetDifficulty(const CBlockIndex* blockindex)
  {
      // Floating point number that is a multiple of the minimum difficulty,
      // minimum difficulty = 1.0.
      if (blockindex == NULL) {
          if (chainActive.Tip() == NULL)
              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("merkleroot", blockindex->hashMerkleRoot.GetHex()));
      result.push_back(Pair("time", (int64_t)blockindex->nTime));
      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()));
      result.push_back(Pair("acc_checkpoint", blockindex->nAccumulatorCheckpoint.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()));
      return result;
  }
  
  UniValue blockToJSON(const CBlock& block, const CBlockIndex* blockindex, bool txDetails = false)
  {
      UniValue result(UniValue::VOBJ);
      result.push_back(Pair("hash", block.GetHash().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("merkleroot", block.hashMerkleRoot.GetHex()));
      result.push_back(Pair("acc_checkpoint", block.nAccumulatorCheckpoint.GetHex()));
      UniValue txs(UniValue::VARR);
      BOOST_FOREACH (const CTransaction& tx, block.vtx) {
          if (txDetails) {
              UniValue objTx(UniValue::VOBJ);
              TxToJSON(tx, uint256(0), objTx);
              txs.push_back(objTx);
          } else
              txs.push_back(tx.GetHash().GetHex());
      }
      result.push_back(Pair("tx", txs));
      result.push_back(Pair("time", block.GetBlockTime()));
      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("moneysupply",ValueFromAmount(blockindex->nMoneySupply)));
  
      UniValue zpivObj(UniValue::VOBJ);
      for (auto denom : libzerocoin::zerocoinDenomList) {
          zpivObj.push_back(Pair(to_string(denom), ValueFromAmount(blockindex->mapZerocoinSupply.at(denom) * (denom*COIN))));
      }
      zpivObj.push_back(Pair("total", ValueFromAmount(blockindex->GetZerocoinSupply())));
      result.push_back(Pair("zBACsupply", zpivObj));
  
      return result;
  }
  
  UniValue getblockcount(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw runtime_error(
              "getblockcount\n"
              "\nReturns the number of blocks in the longest block chain.\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 UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw runtime_error(
              "getbestblockhash\n"
              "\nReturns the hash of the best (tip) block in the longest block chain.\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 getdifficulty(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw 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();
  }
  
  
  UniValue mempoolToJSON(bool fVerbose = false)
  {
      if (fVerbose) {
          LOCK(mempool.cs);
          UniValue o(UniValue::VOBJ);
          BOOST_FOREACH (const PAIRTYPE(uint256, CTxMemPoolEntry) & entry, mempool.mapTx) {
              const uint256& hash = entry.first;
              const CTxMemPoolEntry& e = entry.second;
              UniValue info(UniValue::VOBJ);
              info.push_back(Pair("size", (int)e.GetTxSize()));
              info.push_back(Pair("fee", ValueFromAmount(e.GetFee())));
              info.push_back(Pair("time", e.GetTime()));
              info.push_back(Pair("height", (int)e.GetHeight()));
              info.push_back(Pair("startingpriority", e.GetPriority(e.GetHeight())));
              info.push_back(Pair("currentpriority", e.GetPriority(chainActive.Height())));
              const CTransaction& tx = e.GetTx();
              set<string> setDepends;
              BOOST_FOREACH (const CTxIn& txin, tx.vin) {
                  if (mempool.exists(txin.prevout.hash))
                      setDepends.insert(txin.prevout.hash.ToString());
              }
  
              UniValue depends(UniValue::VARR);
              BOOST_FOREACH(const string& dep, setDepends) {
                  depends.push_back(dep);
              }
  
              info.push_back(Pair("depends", depends));
              o.push_back(Pair(hash.ToString(), info));
          }
          return o;
      } else {
          vector<uint256> vtxid;
          mempool.queryHashes(vtxid);
  
          UniValue a(UniValue::VARR);
          BOOST_FOREACH (const uint256& hash, vtxid)
              a.push_back(hash.ToString());
  
          return a;
      }
  }
  
  UniValue getrawmempool(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() > 1)
          throw runtime_error(
              "getrawmempool ( verbose )\n"
              "\nReturns all transaction ids in memory pool as a json array of string transaction ids.\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"
              "    \"size\" : n,             (numeric) transaction size in bytes\n"
              "    \"fee\" : n,              (numeric) transaction fee in bitalley\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"
              "    \"startingpriority\" : n, (numeric) priority when transaction entered pool\n"
              "    \"currentpriority\" : n,  (numeric) transaction priority now\n"
              "    \"depends\" : [           (array) unconfirmed transactions used as inputs for this transaction\n"
              "        \"transactionid\",    (string) parent transaction id\n"
              "       ... ]\n"
              "  }, ...\n"
              "]\n"
  
              "\nExamples\n" +
              HelpExampleCli("getrawmempool", "true") + HelpExampleRpc("getrawmempool", "true"));
  
      LOCK(cs_main);
  
      bool fVerbose = false;
      if (params.size() > 0)
          fVerbose = params[0].get_bool();
  
      return mempoolToJSON(fVerbose);
  }
  
  UniValue getblockhash(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 1)
          throw runtime_error(
              "getblockhash index\n"
              "\nReturns hash of block in best-block-chain at index provided.\n"
  
              "\nArguments:\n"
              "1. index         (numeric, required) The block index\n"
  
              "\nResult:\n"
              "\"hash\"         (string) The block hash\n"
  
              "\nExamples:\n" +
              HelpExampleCli("getblockhash", "1000") + HelpExampleRpc("getblockhash", "1000"));
  
      LOCK(cs_main);
  
      int nHeight = 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 getblock(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() < 1 || params.size() > 2)
          throw runtime_error(
              "getblock \"hash\" ( verbose )\n"
              "\nIf verbose is false, returns a string that is serialized, hex-encoded data for block 'hash'.\n"
              "If verbose is true, returns an Object with information about block <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"
              "  \"size\" : n,            (numeric) The block size\n"
              "  \"height\" : n,          (numeric) The block height or index\n"
              "  \"version\" : n,         (numeric) The block version\n"
              "  \"merkleroot\" : \"xxxx\", (string) The merkle root\n"
              "  \"tx\" : [               (array of string) The transaction ids\n"
              "     \"transactionid\"     (string) The transaction id\n"
              "     ,...\n"
              "  ],\n"
              "  \"time\" : ttt,          (numeric) The 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"
              "  \"previousblockhash\" : \"hash\",  (string) The hash of the previous block\n"
              "  \"nextblockhash\" : \"hash\"       (string) The hash of the next block\n"
              "  \"moneysupply\" : \"supply\"       (numeric) The money supply when this block was added to the blockchain\n"
              "  \"zBACsupply\" :\n"
              "  {\n"
              "     \"1\" : n,            (numeric) supply of 1 zBAC denomination\n"
              "     \"5\" : n,            (numeric) supply of 5 zBAC denomination\n"
              "     \"10\" : n,           (numeric) supply of 10 zBAC denomination\n"
              "     \"50\" : n,           (numeric) supply of 50 zBAC denomination\n"
              "     \"100\" : n,          (numeric) supply of 100 zBAC denomination\n"
              "     \"500\" : n,          (numeric) supply of 500 zBAC denomination\n"
              "     \"1000\" : n,         (numeric) supply of 1000 zBAC denomination\n"
              "     \"5000\" : n,         (numeric) supply of 5000 zBAC denomination\n"
              "     \"total\" : n,        (numeric) The total supply of all zBAC denominations\n"
              "  }\n"
              "}\n"
  
              "\nResult (for verbose=false):\n"
              "\"data\"             (string) A string that is serialized, hex-encoded data for block 'hash'.\n"
  
              "\nExamples:\n" +
              HelpExampleCli("getblock", "\"00000000000fd08c2fb661d2fcb0d49abb3a91e5f27082ce64feed3b4dede2e2\"") +
              HelpExampleRpc("getblock", "\"00000000000fd08c2fb661d2fcb0d49abb3a91e5f27082ce64feed3b4dede2e2\""));
  
      LOCK(cs_main);
  
      std::string strHash = params[0].get_str();
      uint256 hash(strHash);
  
      bool fVerbose = true;
      if (params.size() > 1)
          fVerbose = params[1].get_bool();
  
      if (mapBlockIndex.count(hash) == 0)
          throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
  
      CBlock block;
      CBlockIndex* pblockindex = mapBlockIndex[hash];
  
      if (!ReadBlockFromDisk(block, pblockindex))
          throw JSONRPCError(RPC_INTERNAL_ERROR, "Can't read block from disk");
  
      if (!fVerbose) {
          CDataStream ssBlock(SER_NETWORK, PROTOCOL_VERSION);
          ssBlock << block;
          std::string strHex = HexStr(ssBlock.begin(), ssBlock.end());
          return strHex;
      }
  
      return blockToJSON(block, pblockindex);
  }
  
  UniValue getblockheader(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() < 1 || params.size() > 2)
          throw runtime_error(
              "getblockheader \"hash\" ( verbose )\n"
              "\nIf verbose is false, returns a string that is serialized, hex-encoded data for block 'hash' header.\n"
              "If verbose is true, returns an Object with information about block <hash> header.\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"
              "  \"version\" : n,         (numeric) The block version\n"
              "  \"previousblockhash\" : \"hash\",  (string) The hash of the previous block\n"
              "  \"merkleroot\" : \"xxxx\", (string) The merkle root\n"
              "  \"time\" : ttt,          (numeric) The block time in seconds since epoch (Jan 1 1970 GMT)\n"
              "  \"bits\" : \"1d00ffff\", (string) The bits\n"
              "  \"nonce\" : n,           (numeric) The nonce\n"
              "}\n"
  
              "\nResult (for verbose=false):\n"
              "\"data\"             (string) A string that is serialized, hex-encoded data for block 'hash' header.\n"
  
              "\nExamples:\n" +
              HelpExampleCli("getblockheader", "\"00000000000fd08c2fb661d2fcb0d49abb3a91e5f27082ce64feed3b4dede2e2\"") +
              HelpExampleRpc("getblockheader", "\"00000000000fd08c2fb661d2fcb0d49abb3a91e5f27082ce64feed3b4dede2e2\""));
  
      std::string strHash = params[0].get_str();
      uint256 hash(strHash);
  
      bool fVerbose = true;
      if (params.size() > 1)
          fVerbose = 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 gettxoutsetinfo(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw 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 output transactions\n"
              "  \"bytes_serialized\": n,  (numeric) The serialized size\n"
              "  \"hash_serialized\": \"hash\",   (string) The serialized hash\n"
              "  \"total_amount\": x.xxx          (numeric) The total amount\n"
              "}\n"
  
              "\nExamples:\n" +
              HelpExampleCli("gettxoutsetinfo", "") + HelpExampleRpc("gettxoutsetinfo", ""));
  
      LOCK(cs_main);
  
      UniValue ret(UniValue::VOBJ);
  
      CCoinsStats stats;
      FlushStateToDisk();
      if (pcoinsTip->GetStats(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("bytes_serialized", (int64_t)stats.nSerializedSize));
          ret.push_back(Pair("hash_serialized", stats.hashSerialized.GetHex()));
          ret.push_back(Pair("total_amount", ValueFromAmount(stats.nTotalAmount)));
      }
      return ret;
  }
  
  UniValue gettxout(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() < 2 || params.size() > 3)
          throw runtime_error(
              "gettxout \"txid\" n ( includemempool )\n"
              "\nReturns details about an unspent transaction output.\n"
  
              "\nArguments:\n"
              "1. \"txid\"       (string, required) The transaction id\n"
              "2. n              (numeric, required) vout value\n"
              "3. includemempool  (boolean, optional) Whether to included the mem pool\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 btc\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 bitalley addresses\n"
              "     \"bitalleyaddress\"   	 	(string) bitalley address\n"
              "        ,...\n"
              "     ]\n"
              "  },\n"
              "  \"version\" : n,            (numeric) The version\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 = params[0].get_str();
      uint256 hash(strHash);
      int n = params[1].get_int();
      bool fMempool = true;
      if (params.size() > 2)
          fMempool = params[2].get_bool();
  
      CCoins coins;
      if (fMempool) {
          LOCK(mempool.cs);
          CCoinsViewMemPool view(pcoinsTip, mempool);
          if (!view.GetCoins(hash, coins))
              return NullUniValue;
          mempool.pruneSpent(hash, coins); // TODO: this should be done by the CCoinsViewMemPool
      } else {
          if (!pcoinsTip->GetCoins(hash, coins))
              return NullUniValue;
      }
      if (n < 0 || (unsigned int)n >= coins.vout.size() || coins.vout[n].IsNull())
          return NullUniValue;
  
      BlockMap::iterator it = mapBlockIndex.find(pcoinsTip->GetBestBlock());
      CBlockIndex* pindex = it->second;
      ret.push_back(Pair("bestblock", pindex->GetBlockHash().GetHex()));
      if ((unsigned int)coins.nHeight == MEMPOOL_HEIGHT)
          ret.push_back(Pair("confirmations", 0));
      else
          ret.push_back(Pair("confirmations", pindex->nHeight - coins.nHeight + 1));
      ret.push_back(Pair("value", ValueFromAmount(coins.vout[n].nValue)));
      UniValue o(UniValue::VOBJ);
      ScriptPubKeyToJSON(coins.vout[n].scriptPubKey, o, true);
      ret.push_back(Pair("scriptPubKey", o));
      ret.push_back(Pair("version", coins.nVersion));
      ret.push_back(Pair("coinbase", coins.fCoinBase));
  
      return ret;
  }
  
  UniValue verifychain(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() > 2)
          throw runtime_error(
              "verifychain ( numblocks )\n"
              "\nVerifies blockchain database.\n"
  
              "\nArguments:\n"
              "1. numblocks    (numeric, optional, default=288, 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);
  
      int nCheckLevel = 4;
      int nCheckDepth = GetArg("-checkblocks", 288);
      if (params.size() > 0)
          nCheckDepth = params[1].get_int();
  
      fVerifyingBlocks = true;
      bool fVerified = CVerifyDB().VerifyDB(pcoinsTip, nCheckLevel, nCheckDepth);
      fVerifyingBlocks = false;
  
      return fVerified;
  }
  
  UniValue getblockchaininfo(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw runtime_error(
              "getblockchaininfo\n"
              "Returns an object containing various state info regarding block chain 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"
              "  \"verificationprogress\": xxxx, (numeric) estimate of verification progress [0..1]\n"
              "  \"chainwork\": \"xxxx\"     (string) total amount of work in active chain, in hexadecimal\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("verificationprogress", Checkpoints::GuessVerificationProgress(chainActive.Tip())));
      obj.push_back(Pair("chainwork", chainActive.Tip()->nChainWork.GetHex()));
      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 UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw runtime_error(
              "getchaintips\n"
              "Return information about all known tips in the block tree,"
              " including the main chain as well as orphaned branches.\n"
  
              "\nResult:\n"
              "[\n"
              "  {\n"
              "    \"height\": xxxx,         (numeric) height of the chain tip\n"
              "    \"hash\": \"xxxx\",         (string) block hash of the tip\n"
              "    \"branchlen\": 0          (numeric) zero for main chain\n"
              "    \"status\": \"active\"      (string) \"active\" for the main chain\n"
              "  },\n"
              "  {\n"
              "    \"height\": xxxx,\n"
              "    \"hash\": \"xxxx\",\n"
              "    \"branchlen\": 1          (numeric) length of branch connecting the tip to 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);
  
      /* Build up a list of chain tips.  We start with the list of all
         known blocks, and successively remove blocks that appear as pprev
         of another block.  */
      std::set<const CBlockIndex*, CompareBlocksByHeight> setTips;
      BOOST_FOREACH (const PAIRTYPE(const uint256, CBlockIndex*) & item, mapBlockIndex)
          setTips.insert(item.second);
      BOOST_FOREACH (const PAIRTYPE(const uint256, CBlockIndex*) & item, mapBlockIndex) {
          const CBlockIndex* pprev = item.second->pprev;
          if (pprev)
              setTips.erase(pprev);
      }
  
      // Always report the currently active tip.
      setTips.insert(chainActive.Tip());
  
      /* Construct the output array.  */
      UniValue res(UniValue::VARR);
      BOOST_FOREACH (const CBlockIndex* block, setTips) {
          UniValue obj(UniValue::VOBJ);
          obj.push_back(Pair("height", block->nHeight));
          obj.push_back(Pair("hash", block->phashBlock->GetHex()));
  
          const int branchLen = block->nHeight - chainActive.FindFork(block)->nHeight;
          obj.push_back(Pair("branchlen", branchLen));
  
          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 getfeeinfo(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 1)
          throw runtime_error(
              "getfeeinfo blocks\n"
              "\nReturns details of transaction fees over the last n blocks.\n"
  
              "\nArguments:\n"
              "1. blocks     (int, required) the number of blocks to get transaction data from\n"
  
              "\nResult:\n"
              "{\n"
              "  \"txcount\": xxxxx                (numeric) Current tx count\n"
              "  \"txbytes\": xxxxx                (numeric) Sum of all tx sizes\n"
              "  \"ttlfee\": xxxxx                 (numeric) Sum of all fees\n"
              "  \"feeperkb\": xxxxx               (numeric) Average fee per kb over the block range\n"
              "  \"rec_highpriorityfee_perkb\": xxxxx    (numeric) Recommended fee per kb to use for a high priority tx\n"
              "}\n"
  
              "\nExamples:\n" +
              HelpExampleCli("getfeeinfo", "5") + HelpExampleRpc("getfeeinfo", "5"));
  
      LOCK(cs_main);
  
      int nBlocks = params[0].get_int();
      int nBestHeight = chainActive.Height();
      int nStartHeight = nBestHeight - nBlocks;
      if (nBlocks < 0 || nStartHeight <= 0)
          throw JSONRPCError(RPC_INVALID_PARAMETER, "invalid start height");
  
      CAmount nFees = 0;
      int64_t nBytes = 0;
      int64_t nTotal = 0;
      for (int i = nStartHeight; i <= nBestHeight; i++) {
          CBlockIndex* pindex = chainActive[i];
          CBlock block;
          if (!ReadBlockFromDisk(block, pindex))
              throw JSONRPCError(RPC_DATABASE_ERROR, "failed to read block from disk");
  
          CAmount nValueIn = 0;
          CAmount nValueOut = 0;
          for (const CTransaction& tx : block.vtx) {
              if (tx.IsCoinBase() || tx.IsCoinStake())
                  continue;
  
              for (unsigned int j = 0; j < tx.vin.size(); j++) {
                  if (tx.vin[j].scriptSig.IsZerocoinSpend()) {
                      nValueIn += tx.vin[j].nSequence * COIN;
                      continue;
                  }
  
                  COutPoint prevout = tx.vin[j].prevout;
                  CTransaction txPrev;
                  uint256 hashBlock;
                  if(!GetTransaction(prevout.hash, txPrev, hashBlock, true))
                      throw JSONRPCError(RPC_DATABASE_ERROR, "failed to read tx from disk");
                  nValueIn += txPrev.vout[prevout.n].nValue;
              }
  
              for (unsigned int j = 0; j < tx.vout.size(); j++) {
                  nValueOut += tx.vout[j].nValue;
              }
  
              nFees += nValueIn - nValueOut;
              nBytes += tx.GetSerializeSize(SER_NETWORK, CLIENT_VERSION);
              nTotal++;
          }
  
          pindex = chainActive.Next(pindex);
          if (!pindex)
              break;
      }
  
      UniValue ret(UniValue::VOBJ);
      CFeeRate nFeeRate = CFeeRate(nFees, nBytes);
      ret.push_back(Pair("txcount", (int64_t)nTotal));
      ret.push_back(Pair("txbytes", (int64_t)nBytes));
      ret.push_back(Pair("ttlfee", FormatMoney(nFees)));
      ret.push_back(Pair("feeperkb", FormatMoney(nFeeRate.GetFeePerK())));
      ret.push_back(Pair("rec_highpriorityfee_perkb", FormatMoney(nFeeRate.GetFeePerK() + 1000)));
  
      return ret;
  }
  
  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()));
  
      return ret;
  }
  
  UniValue getmempoolinfo(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 0)
          throw 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"
              "}\n"
  
              "\nExamples:\n" +
              HelpExampleCli("getmempoolinfo", "") + HelpExampleRpc("getmempoolinfo", ""));
  
      return mempoolInfoToJSON();
  }
  
  UniValue invalidateblock(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 1)
          throw runtime_error(
              "invalidateblock \"hash\"\n"
              "\nPermanently marks a block as invalid, as if it violated a consensus rule.\n"
  
              "\nArguments:\n"
              "1. hash   (string, required) the hash of the block to mark as invalid\n"
  
              "\nExamples:\n" +
              HelpExampleCli("invalidateblock", "\"blockhash\"") + HelpExampleRpc("invalidateblock", "\"blockhash\""));
  
      std::string strHash = params[0].get_str();
      uint256 hash(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, pblockindex);
      }
  
      if (state.IsValid()) {
          ActivateBestChain(state);
      }
  
      if (!state.IsValid()) {
          throw JSONRPCError(RPC_DATABASE_ERROR, state.GetRejectReason());
      }
  
      return NullUniValue;
  }
  
  UniValue reconsiderblock(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 1)
          throw runtime_error(
              "reconsiderblock \"hash\"\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. hash   (string, required) the hash of the block to reconsider\n"
  
              "\nExamples:\n" +
              HelpExampleCli("reconsiderblock", "\"blockhash\"") + HelpExampleRpc("reconsiderblock", "\"blockhash\""));
  
      std::string strHash = params[0].get_str();
      uint256 hash(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];
          ReconsiderBlock(state, pblockindex);
      }
  
      if (state.IsValid()) {
          ActivateBestChain(state);
      }
  
      if (!state.IsValid()) {
          throw JSONRPCError(RPC_DATABASE_ERROR, state.GetRejectReason());
      }
  
      return NullUniValue;
  }
  
  UniValue findserial(const UniValue& params, bool fHelp)
  {
      if(fHelp || params.size() != 1)
          throw runtime_error(
              "findserial \"serial\"\n"
              "\nSearches the zerocoin database for a zerocoin spend transaction that contains the specified serial\n"
  
              "\nArguments:\n"
              "1. serial   (string, required) the serial of a zerocoin spend to search for.\n"
  
              "\nResult:\n"
              "{\n"
              "  \"success\": true|false        (boolean) Whether the serial was found\n"
              "  \"txid\": \"xxx\"              (string) The transaction that contains the spent serial\n"
              "}\n"
  
              "\nExamples:\n" +
              HelpExampleCli("findserial", "\"serial\"") + HelpExampleRpc("findserial", "\"serial\""));
  
      std::string strSerial = params[0].get_str();
      CBigNum bnSerial = 0;
      bnSerial.SetHex(strSerial);
      if (!bnSerial)
  	throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Invalid serial");
  
      uint256 txid = 0;
      bool fSuccess = zerocoinDB->ReadCoinSpend(bnSerial, txid);
  
      UniValue ret(UniValue::VOBJ);
      ret.push_back(Pair("success", fSuccess));
      ret.push_back(Pair("txid", txid.GetHex()));
      return ret;
  }
  
  UniValue getaccumulatorvalues(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 1)
          throw runtime_error(
              "getaccumulatorvalues \"height\"\n"
                      "\nReturns the accumulator values associated with a block height\n"
  
                      "\nArguments:\n"
                      "1. height   (numeric, required) the height of the checkpoint.\n"
  
                      "\nExamples:\n" +
              HelpExampleCli("getaccumulatorvalues", "\"height\"") + HelpExampleRpc("getaccumulatorvalues", "\"height\""));
  
      int nHeight = params[0].get_int();
  
      CBlockIndex* pindex = chainActive[nHeight];
      if (!pindex)
          throw JSONRPCError(RPC_INVALID_PARAMETER, "invalid block height");
  
      UniValue ret(UniValue::VARR);
      for (libzerocoin::CoinDenomination denom : libzerocoin::zerocoinDenomList) {
          CBigNum bnValue;
          if(!GetAccumulatorValueFromDB(pindex->nAccumulatorCheckpoint, denom, bnValue))
              throw JSONRPCError(RPC_DATABASE_ERROR, "failed to find value in database");
  
          UniValue obj(UniValue::VOBJ);
          obj.push_back(Pair(std::to_string(denom), bnValue.GetHex()));
          ret.push_back(obj);
      }
  
      return ret;
  }