text: // Copyright (c) 2010 Satoshi Nakamoto
  // Copyright (c) 2009-2014 The Bitcoin developers
  // Copyright (c) 2014-2015 The Dash developers
  // Copyright (c) 2015-2019 The PIVX developers
  // Copyright (c) 2019 The Versess 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 "rpc/server.h"
  #include "sync.h"
  #include "txdb.h"
  #include "util.h"
  #include "utilmoneystr.h"
  #include "zvers/accumulatormap.h"
  #include "zvers/accumulators.h"
  #include "wallet/wallet.h"
  #include "zvers/zversmodule.h"
  #include "zverschain.h"
  
  #include <stdint.h>
  #include <fstream>
  #include <iostream>
  #include <univalue.h>
  #include <mutex>
  #include <numeric>
  #include <condition_variable>
  
  using namespace std;
  
  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);
  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("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()));
      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);
      for (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("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("modifier", strprintf("%016x", blockindex->nStakeModifier)));
  
      result.push_back(Pair("moneysupply",ValueFromAmount(blockindex->nMoneySupply)));
  
      UniValue zversObj(UniValue::VOBJ);
      for (auto denom : libzerocoin::zerocoinDenomList) {
          zversObj.push_back(Pair(to_string(denom), ValueFromAmount(blockindex->mapZerocoinSupply.at(denom) * (denom*COIN))));
      }
      zversObj.push_back(Pair("total", ValueFromAmount(blockindex->GetZerocoinSupply())));
      result.push_back(Pair("zVERSsupply", zversObj));
  
      return result;
  }
  
  UniValue getchecksumblock(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() < 2 || params.size() > 3)
          throw runtime_error(
              "getchecksumblock\n"
              "\nFinds the first occurrence of a certain accumulator checksum."
              "\nReturns the block hash or, if fVerbose=true, the JSON block object\n"
  
              "\nArguments:\n"
              "1. \"checksum\"      (string, required) The hex encoded accumulator checksum\n"
              "2. \"denom\"         (integer, required) The denomination of the accumulator\n"
              "3. fVerbose          (boolean, optional, default=false) true for a json object, false for the hex encoded hash\n"
  
              "\nResult (for fVerbose = 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"
              "  \"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"
              "  \"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"
              "  \"zVERSsupply\" :\n"
              "  {\n"
              "     \"1\" : n,            (numeric) supply of 1 zVERS denomination\n"
              "     \"5\" : n,            (numeric) supply of 5 zVERS denomination\n"
              "     \"10\" : n,           (numeric) supply of 10 zVERS denomination\n"
              "     \"50\" : n,           (numeric) supply of 50 zVERS denomination\n"
              "     \"100\" : n,          (numeric) supply of 100 zVERS denomination\n"
              "     \"500\" : n,          (numeric) supply of 500 zVERS denomination\n"
              "     \"1000\" : n,         (numeric) supply of 1000 zVERS denomination\n"
              "     \"5000\" : n,         (numeric) supply of 5000 zVERS denomination\n"
              "     \"total\" : n,        (numeric) The total supply of all zVERS 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("getchecksumblock", "\"00000000000fd08c2fb661d2fcb0d49abb3a91e5f27082ce64feed3b4dede2e2\", 5") +
              HelpExampleRpc("getchecksumblock", "\"00000000000fd08c2fb661d2fcb0d49abb3a91e5f27082ce64feed3b4dede2e2\", 5"));
  
  
      LOCK(cs_main);
  
      // param 0
      std::string acc_checksum_str = params[0].get_str();
      uint256 checksum_256(acc_checksum_str);
      uint32_t acc_checksum = checksum_256.Get32();
      // param 1
      libzerocoin::CoinDenomination denomination = libzerocoin::IntToZerocoinDenomination(params[1].get_int());
      // param 2
      bool fVerbose = false;
      if (params.size() > 2)
          fVerbose = params[2].get_bool();
  
      int checksumHeight = GetChecksumHeight(acc_checksum, denomination);
  
      if (checksumHeight == 0)
          throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Block not found");
  
      CBlockIndex* pblockindex = chainActive[checksumHeight];
  
      if (!fVerbose)
          return pblockindex->GetBlockHash().GetHex();
  
      CBlock block;
      if (!ReadBlockFromDisk(block, pblockindex))
          throw JSONRPCError(RPC_INTERNAL_ERROR, "Can't read block from disk");
  
      return blockToJSON(block, pblockindex);
  }
  
  
  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();
  }
  
  void RPCNotifyBlockChange(const uint256 hashBlock)
  {
      CBlockIndex* pindex = nullptr;
      pindex = mapBlockIndex.at(hashBlock);
      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 UniValue& params, bool fHelp)
  {
      if (fHelp || 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 (params.size() > 0)
          timeout = 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 UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() < 1 || 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(params[0].get_str());
  
      if (params.size() > 1)
          timeout = 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 UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() < 1 || 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 = params[0].get_int();
  
      if (params.size() > 1)
          timeout = 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 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);
          for (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;
              for (const CTxIn& txin : tx.vin) {
                  if (mempool.exists(txin.prevout.hash))
                      setDepends.insert(txin.prevout.hash.ToString());
              }
  
              UniValue depends(UniValue::VARR);
              for (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);
          for (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 versess\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"
              "  \"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"
              "  \"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"
              "  \"zVERSsupply\" :\n"
              "  {\n"
              "     \"1\" : n,            (numeric) supply of 1 zVERS denomination\n"
              "     \"5\" : n,            (numeric) supply of 5 zVERS denomination\n"
              "     \"10\" : n,           (numeric) supply of 10 zVERS denomination\n"
              "     \"50\" : n,           (numeric) supply of 50 zVERS denomination\n"
              "     \"100\" : n,          (numeric) supply of 100 zVERS denomination\n"
              "     \"500\" : n,          (numeric) supply of 500 zVERS denomination\n"
              "     \"1000\" : n,         (numeric) supply of 1000 zVERS denomination\n"
              "     \"5000\" : n,         (numeric) supply of 5000 zVERS denomination\n"
              "     \"total\" : n,        (numeric) The total supply of all zVERS 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"
              "  \"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"
              "}\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 versess addresses\n"
              "     \"versessaddress\"   	 	(string) versess 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() > 1)
          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[0].get_int();
  
      fVerifyingBlocks = true;
      bool fVerified = CVerifyDB().VerifyDB(pcoinsTip, nCheckLevel, nCheckDepth);
      fVerifyingBlocks = false;
  
      return fVerified;
  }
  
  /** Implementation of IsSuperMajority with better feedback */
  static UniValue SoftForkMajorityDesc(int minVersion, CBlockIndex* pindex, int nRequired)
  {
      int nFound = 0;
      CBlockIndex* pstart = pindex;
      for (int i = 0; i < Params().ToCheckBlockUpgradeMajority() && pstart != NULL; i++)
      {
          if (pstart->nVersion >= minVersion)
              ++nFound;
          pstart = pstart->pprev;
      }
      UniValue rv(UniValue::VOBJ);
      rv.push_back(Pair("status", nFound >= nRequired));
      rv.push_back(Pair("found", nFound));
      rv.push_back(Pair("required", nRequired));
      rv.push_back(Pair("window", Params().ToCheckBlockUpgradeMajority()));
      return rv;
  }
  static UniValue SoftForkDesc(const std::string &name, int version, CBlockIndex* pindex)
  {
      UniValue rv(UniValue::VOBJ);
      rv.push_back(Pair("id", name));
      rv.push_back(Pair("version", version));
      rv.push_back(Pair("enforce", SoftForkMajorityDesc(version, pindex, Params().EnforceBlockUpgradeMajority())));
      rv.push_back(Pair("reject", SoftForkMajorityDesc(version, pindex, Params().RejectBlockOutdatedMajority())));
      return rv;
  }
  
  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"
              "  \"softforks\": [            (array) status of softforks in progress\n"
              "     {\n"
              "        \"id\": \"xxxx\",        (string) name of softfork\n"
              "        \"version\": xx,         (numeric) block version\n"
              "        \"enforce\": {           (object) progress toward enforcing the softfork rules for new-version blocks\n"
              "           \"status\": xx,       (boolean) true if threshold reached\n"
              "           \"found\": xx,        (numeric) number of blocks with the new version found\n"
              "           \"required\": xx,     (numeric) number of blocks required to trigger\n"
              "           \"window\": xx,       (numeric) maximum size of examined window of recent blocks\n"
              "        },\n"
              "        \"reject\": { ... }      (object) progress toward rejecting pre-softfork blocks (same fields as \"enforce\")\n"
              "     }, ...\n"
              "  ]\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()));
      CBlockIndex* tip = chainActive.Tip();
      UniValue softforks(UniValue::VARR);
      softforks.push_back(SoftForkDesc("bip65", 5, tip));
      obj.push_back(Pair("softforks",             softforks));
      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;
      for (const PAIRTYPE(const uint256, CBlockIndex*) & item : mapBlockIndex)
          setTips.insert(item.second);
      for (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);
      for (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"));
  
      int nBlocks = params[0].get_int();
      int nBestHeight;
      {
          LOCK(cs_main);
          nBestHeight = chainActive.Height();
      }
      int nStartHeight = nBestHeight - nBlocks;
      if (nBlocks < 0 || nStartHeight <= 0)
          throw JSONRPCError(RPC_INVALID_PARAMETER, "invalid start height");
  
      UniValue newParams(UniValue::VARR);
      newParams.push_back(UniValue(nStartHeight));
      newParams.push_back(UniValue(nBlocks));
      newParams.push_back(UniValue(true));    // fFeeOnly
  
      return getblockindexstats(newParams, false);
  }
  
  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;
  }
  
  
  UniValue getaccumulatorwitness(const UniValue& params, bool fHelp)
  {
      if (fHelp || params.size() != 2)
          throw runtime_error(
                  "getaccumulatorwitness \"commitmentCoinValue, coinDenomination\"\n"
                  "\nReturns the accumulator witness value associated with the coin\n"
  
                  "\nArguments:\n"
                  "1. coinValue             (string, required) the commitment value of the coin in HEX.\n"
                  "2. coinDenomination      (numeric, required) the coin denomination.\n"
  
                  "\nResult:\n"
                  "{\n"
                  "  \"Accumulator Value\": \"xxx\"  (string) Accumulator hex value\n"
                  "  \"Denomination\": \"d\"         (integer) Accumulator denomination\n"
                  "  \"Mints added\": \"d\"          (integer) Number of mints added to the accumulator\n"
                  "  \"Witness Value\": \"xxx\"      (string) Witness hex value\n"
                  "}\n"
  
                  "\nExamples:\n" +
                  HelpExampleCli("getaccumulatorwitness", "\"5fb87fb7bb638e83bfc14bcf33ac6f8064c9884dc72a4e652666abcf42cc47f9da0a7aca58076b0122a19b25629a6b6e7461f188baa7c00865b862cdb270d934873648aa12dd66e3242da40e4c17c78b70fded35e2d9c72933b455fadce9684586b1d48b10570d66feebe51ccebb1d98595217d06f41e66d5a0d9246d46ec3dd\" 5") + HelpExampleRpc("getaccumulatorwitness", "\"5fb87fb7bb638e83bfc14bcf33ac6f8064c9884dc72a4e652666abcf42cc47f9da0a7aca58076b0122a19b25629a6b6e7461f188baa7c00865b862cdb270d934873648aa12dd66e3242da40e4c17c78b70fded35e2d9c72933b455fadce9684586b1d48b10570d66feebe51ccebb1d98595217d06f41e66d5a0d9246d46ec3dd\", 5"));
  
  
      CBigNum coinValue;
      coinValue.SetHex(params[0].get_str());
  
      int d = params[1].get_int();
      libzerocoin::CoinDenomination denomination = libzerocoin::IntToZerocoinDenomination(d);
      libzerocoin::ZerocoinParams* zcparams = Params().Zerocoin_Params();
  
      // Public coin
      libzerocoin::PublicCoin pubCoin(zcparams, coinValue, denomination);
  
      //Compute Accumulator and Witness
      libzerocoin::Accumulator accumulator(zcparams, pubCoin.getDenomination());
      libzerocoin::AccumulatorWitness witness(zcparams, accumulator, pubCoin);
      string strFailReason = "";
      int nMintsAdded = 0;
      CZerocoinSpendReceipt receipt;
  
      if (!GenerateAccumulatorWitness(pubCoin, accumulator, witness, nMintsAdded, strFailReason)) {
          receipt.SetStatus(_(strFailReason.c_str()), ZVERS_FAILED_ACCUMULATOR_INITIALIZATION);
          throw JSONRPCError(RPC_DATABASE_ERROR, receipt.GetStatusMessage());
      }
  
      UniValue obj(UniValue::VOBJ);
      obj.push_back(Pair("Accumulator Value", accumulator.getValue().GetHex()));
      obj.push_back(Pair("Denomination", accumulator.getDenomination()));
      obj.push_back(Pair("Mints added",nMintsAdded));
      obj.push_back(Pair("Witness Value", witness.getValue().GetHex()));
  
      return obj;
  }
  
  void validaterange(const UniValue& params, int& heightStart, int& heightEnd, int minHeightStart)
  {
      if (params.size() < 2) {
          throw JSONRPCError(RPC_INVALID_PARAMETER, "Not enough parameters in validaterange");
      }
  
      int nBestHeight;
      {
          LOCK(cs_main);
          nBestHeight = chainActive.Height();
      }
  
      heightStart = params[0].get_int();
      if (heightStart > nBestHeight) {
          throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid starting block (%d). Out of range.", heightStart));
      }
  
      const int range = params[1].get_int();
      if (range < 1) {
          throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid block range. Must be strictly positive.");
      }
  
      heightEnd = heightStart + range - 1;
  
      if (heightStart < minHeightStart && heightEnd >= minHeightStart) {
          heightStart = minHeightStart;
      }
  
      if (heightEnd > nBestHeight) {
          throw JSONRPCError(RPC_INVALID_PARAMETER, strprintf("Invalid ending block (%d). Out of range.", heightEnd));
      }
  }
  
  UniValue getmintsinblocks(const UniValue& params, bool fHelp) {
      if (fHelp || params.size() != 3)
          throw runtime_error(
                  "getmintsinblocks height range coinDenomination\n"
                  "\nReturns the number of mints of a certain denomination"
                  "\noccurred in blocks [height, height+1, height+2, ..., height+range-1]\n"
  
                  "\nArguments:\n"
                  "1. height             (numeric, required) block height where the search starts.\n"
                  "2. range              (numeric, required) number of blocks to include.\n"
                  "3. coinDenomination   (numeric, required) coin denomination.\n"
  
                  "\nResult:\n"
                  "{\n"
                  "  \"Starting block\": \"x\"           (integer) First counted block\n"
                  "  \"Ending block\": \"x\"             (integer) Last counted block\n"
                  "  \"Number of d-denom mints\": \"x\"  (integer) number of mints of the required d denomination\n"
                  "}\n"
  
                  "\nExamples:\n" +
                  HelpExampleCli("getmintsinblocks", "1200000 1000 5") +
                  HelpExampleRpc("getmintsinblocks", "1200000, 1000, 5"));
  
      int heightStart, heightEnd;
      validaterange(params, heightStart, heightEnd, Params().Zerocoin_StartHeight());
  
      int d = params[2].get_int();
      libzerocoin::CoinDenomination denom = libzerocoin::IntToZerocoinDenomination(d);
      if (denom == libzerocoin::CoinDenomination::ZQ_ERROR)
          throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid denomination. Must be in {1, 5, 10, 50, 100, 500, 1000, 5000}");
  
      int num_of_mints = 0;
      {
          LOCK(cs_main);
          CBlockIndex* pindex = chainActive[heightStart];
  
          while (true) {
              num_of_mints += count(pindex->vMintDenominationsInBlock.begin(), pindex->vMintDenominationsInBlock.end(), denom);
              if (pindex->nHeight < heightEnd) {
                  pindex = chainActive.Next(pindex);
              } else {
                  break;
              }
          }
      }
  
      UniValue obj(UniValue::VOBJ);
      obj.push_back(Pair("Starting block", heightStart));
      obj.push_back(Pair("Ending block", heightEnd-1));
      obj.push_back(Pair("Number of "+ std::to_string(d) +"-denom mints", num_of_mints));
  
      return obj;
  }
  
  
  UniValue getserials(const UniValue& params, bool fHelp) {
      if (fHelp || params.size() < 2 || params.size() > 3)
          throw runtime_error(
              "getserials height range ( fVerbose )\n"
              "\nLook the inputs of any tx in a range of blocks and returns the serial numbers for any coinspend.\n"
  
              "\nArguments:\n"
              "1. starting_height   (numeric, required) the height of the first block to check\n"
              "2. range             (numeric, required) the amount of blocks to check\n"
              "3. fVerbose          (boolean, optional, default=False) return verbose output\n"
  
              "\nExamples:\n" +
              HelpExampleCli("getserials", "1254000 1000") +
              HelpExampleRpc("getserials", "1254000, 1000"));
  
      int heightStart, heightEnd;
      validaterange(params, heightStart, heightEnd, Params().Zerocoin_StartHeight());
  
      bool fVerbose = false;
      if (params.size() > 2) {
          fVerbose = params[2].get_bool();
      }
  
      CBlockIndex* pblockindex = nullptr;
      {
          LOCK(cs_main);
          pblockindex = chainActive[heightStart];
      }
  
      if (!pblockindex)
          throw JSONRPCError(RPC_INVALID_PARAMETER, "invalid block height");
  
      UniValue serialsObj(UniValue::VOBJ);    // for fVerbose
      UniValue serialsArr(UniValue::VARR);
  
      while (true) {
          CBlock block;
          if (!ReadBlockFromDisk(block, pblockindex))
                  throw JSONRPCError(RPC_INTERNAL_ERROR, "Can't read block from disk");
  
          // loop through each tx in the block
          for (const CTransaction& tx : block.vtx) {
              std::string txid = tx.GetHash().GetHex();
              // collect the destination (first output) if fVerbose
              std::string spentTo = "";
              if (fVerbose) {
                  if (tx.vout[0].IsZerocoinMint()) {
                      spentTo = "Zerocoin Mint";
                  } else if (tx.vout[0].IsEmpty()) {
                      spentTo = "Zerocoin Stake";
                  } else {
                      txnouttype type;
                      vector<CTxDestination> addresses;
                      int nRequired;
                      if (!ExtractDestinations(tx.vout[0].scriptPubKey, type, addresses, nRequired)) {
                          spentTo = strprintf("type: %d", GetTxnOutputType(type));
                      } else {
                          spentTo = CBitcoinAddress(addresses[0]).ToString();
                      }
                  }
              }
              // loop through each input
              for (const CTxIn& txin : tx.vin) {
                  bool isPublicSpend =  txin.IsZerocoinPublicSpend();
                  if (txin.IsZerocoinSpend() || isPublicSpend) {
                      std::string serial_str;
                      int denom;
                      if (isPublicSpend) {
                          CTxOut prevOut;
                          CValidationState state;
                          if(!GetOutput(txin.prevout.hash, txin.prevout.n, state, prevOut)){
                              throw JSONRPCError(RPC_INTERNAL_ERROR, "public zerocoin spend prev output not found");
                          }
                          libzerocoin::ZerocoinParams *params = Params().Zerocoin_Params();
                          PublicCoinSpend publicSpend(params);
                          if (!ZVERSModule::parseCoinSpend(txin, tx, prevOut, publicSpend)) {
                              throw JSONRPCError(RPC_INTERNAL_ERROR, "public zerocoin spend parse failed");
                          }
                          serial_str = publicSpend.getCoinSerialNumber().ToString(16);
                          denom = libzerocoin::ZerocoinDenominationToInt(publicSpend.getDenomination());
                      } else {
                          libzerocoin::CoinSpend spend = TxInToZerocoinSpend(txin);
                          serial_str = spend.getCoinSerialNumber().ToString(16);
                          denom = libzerocoin::ZerocoinDenominationToInt(spend.getDenomination());
                      }
                      if (!fVerbose) {
                          serialsArr.push_back(serial_str);
                      } else {
                          UniValue s(UniValue::VOBJ);
                          s.push_back(Pair("serial", serial_str));
                          s.push_back(Pair("denom", denom));
                          s.push_back(Pair("bitsize", (int)serial_str.size()*4));
                          s.push_back(Pair("spentTo", spentTo));
                          s.push_back(Pair("txid", txid));
                          s.push_back(Pair("blocknum", pblockindex->nHeight));
                          s.push_back(Pair("blocktime", block.GetBlockTime()));
                          serialsArr.push_back(s);
                      }
                  }
  
              } // end for vin in tx
          } // end for tx in block
  
          if (pblockindex->nHeight < heightEnd) {
              LOCK(cs_main);
              pblockindex = chainActive.Next(pblockindex);
          } else {
              break;
          }
  
      } // end for blocks
  
      return serialsArr;
  
  }
  
  UniValue getblockindexstats(const UniValue& params, bool fHelp) {
      if (fHelp || params.size() < 2 || params.size() > 3)
          throw runtime_error(
                  "getblockindexstats height range ( fFeeOnly )\n"
                  "\nReturns aggregated BlockIndex data for blocks "
                  "\n[height, height+1, height+2, ..., height+range-1]\n"
  
                  "\nArguments:\n"
                  "1. height             (numeric, required) block height where the search starts.\n"
                  "2. range              (numeric, required) number of blocks to include.\n"
                  "3. fFeeOnly           (boolean, optional, default=False) return only fee info.\n"
  
                  "\nResult:\n"
                  "{\n"
                  "  \"first_block\": \"x\"            (integer) First counted block\n"
                  "  \"last_block\": \"x\"             (integer) Last counted block\n"
                  "  \"txcount\": xxxxx                (numeric) tx count (excluding coinbase/coinstake)\n"
                  "  \"txcount_all\": xxxxx            (numeric) tx count (including coinbase/coinstake)\n"
                  "  \"mintcount\": {              [if fFeeOnly=False]\n"
                  "        \"denom_1\": xxxx           (numeric) number of mints of denom_1 occurred over the block range\n"
                  "        \"denom_5\": xxxx           (numeric) number of mints of denom_5 occurred over the block range\n"
                  "         ...                    ... number of mints of other denominations: ..., 10, 50, 100, 500, 1000, 5000\n"
                  "  }\n"
                  "  \"spendcount\": {             [if fFeeOnly=False]\n"
                  "        \"denom_1\": xxxx           (numeric) number of spends of denom_1 occurred over the block range\n"
                  "        \"denom_5\": xxxx           (numeric) number of spends of denom_5 occurred over the block range\n"
                  "         ...                    ... number of spends of other denominations: ..., 10, 50, 100, 500, 1000, 5000\n"
                  "  }\n"
                  "  \"pubspendcount\": {             [if fFeeOnly=False]\n"
                  "        \"denom_1\": xxxx           (numeric) number of PUBLIC spends of denom_1 occurred over the block range\n"
                  "        \"denom_5\": xxxx           (numeric) number of PUBLIC spends of denom_5 occurred over the block range\n"
                  "         ...                    ... number of PUBLIC spends of other denominations: ..., 10, 50, 100, 500, 1000, 5000\n"
                  "  }\n"
                  "  \"txbytes\": xxxxx                (numeric) Sum of the size of all txes (zVERS excluded) over block range\n"
                  "  \"ttlfee\": xxxxx                 (numeric) Sum of the fee amount of all txes (zVERS mints excluded) over block range\n"
                  "  \"ttlfee_all\": xxxxx             (numeric) Sum of the fee amount of all txes (zVERS mints included) over block range\n"
                  "  \"feeperkb\": xxxxx               (numeric) Average fee per kb (excluding zc txes)\n"
                  "}\n"
  
                  "\nExamples:\n" +
                  HelpExampleCli("getblockindexstats", "1200000 1000") +
                  HelpExampleRpc("getblockindexstats", "1200000, 1000"));
  
      int heightStart, heightEnd;
      validaterange(params, heightStart, heightEnd);
      // return object
      UniValue ret(UniValue::VOBJ);
      ret.push_back(Pair("Starting block", heightStart));
      ret.push_back(Pair("Ending block", heightEnd));
  
      bool fFeeOnly = false;
      if (params.size() > 2) {
          fFeeOnly = params[2].get_bool();
      }
  
      CAmount nFees = 0;
      CAmount nFees_all = 0;
      int64_t nBytes = 0;
      int64_t nTxCount = 0;
      int64_t nTxCount_all = 0;
  
      std::map<libzerocoin::CoinDenomination, int64_t> mapMintCount;
      std::map<libzerocoin::CoinDenomination, int64_t> mapSpendCount;
      std::map<libzerocoin::CoinDenomination, int64_t> mapPublicSpendCount;
      for (auto& denom : libzerocoin::zerocoinDenomList) {
          mapMintCount.insert(make_pair(denom, 0));
          mapSpendCount.insert(make_pair(denom, 0));
          mapPublicSpendCount.insert(make_pair(denom, 0));
      }
  
      CBlockIndex* pindex = nullptr;
      {
          LOCK(cs_main);
          pindex = chainActive[heightStart];
      }
  
      if (!pindex)
          throw JSONRPCError(RPC_INVALID_PARAMETER, "invalid block height");
  
      while (true) {
          CBlock block;
          if (!ReadBlockFromDisk(block, pindex)) {
              throw JSONRPCError(RPC_DATABASE_ERROR, "failed to read block from disk");
          }
  
          CAmount nValueIn = 0;
          CAmount nValueOut = 0;
          const int ntx = block.vtx.size();
          nTxCount_all += ntx;
          nTxCount = block.IsProofOfStake() ? nTxCount + ntx - 2 : nTxCount + ntx - 1;
  
          // loop through each tx in block and save size and fee
          for (const CTransaction& tx : block.vtx) {
              if (tx.IsCoinBase() || (tx.IsCoinStake() && !tx.HasZerocoinSpendInputs()))
                  continue;
  
              // fetch input value from prevouts and count spends
              for (unsigned int j = 0; j < tx.vin.size(); j++) {
                  if (tx.vin[j].IsZerocoinSpend()) {
                      if (!fFeeOnly)
                          mapSpendCount[libzerocoin::IntToZerocoinDenomination(tx.vin[j].nSequence)]++;
                      continue;
                  }
                  if (tx.vin[j].IsZerocoinPublicSpend()) {
                      if (!fFeeOnly)
                          mapPublicSpendCount[libzerocoin::IntToZerocoinDenomination(tx.vin[j].nSequence)]++;
                      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;
              }
  
              // zc spends have no fee
              if (tx.HasZerocoinSpendInputs())
                  continue;
  
              // sum output values in nValueOut
              for (unsigned int j = 0; j < tx.vout.size(); j++) {
                  nValueOut += tx.vout[j].nValue;
              }
  
              // update sums
              nFees_all += nValueIn - nValueOut;
              if (!tx.HasZerocoinMintOutputs()) {
                  nFees += nValueIn - nValueOut;
                  nBytes += tx.GetSerializeSize(SER_NETWORK, CLIENT_VERSION);
              }
          }
  
          // add mints to map
          if (!fFeeOnly) {
              for (auto& denom : libzerocoin::zerocoinDenomList) {
                  mapMintCount[denom] += count(pindex->vMintDenominationsInBlock.begin(), pindex->vMintDenominationsInBlock.end(), denom);
              }
          }
  
          if (pindex->nHeight < heightEnd) {
              LOCK(cs_main);
              pindex = chainActive.Next(pindex);
          } else {
              break;
          }
      }
  
      // get fee rate
      CFeeRate nFeeRate = CFeeRate(nFees, nBytes);
  
      // return UniValue object
      ret.push_back(Pair("txcount", (int64_t)nTxCount));
      ret.push_back(Pair("txcount_all", (int64_t)nTxCount_all));
      if (!fFeeOnly) {
          UniValue mint_obj(UniValue::VOBJ);
          UniValue spend_obj(UniValue::VOBJ);
          UniValue pubspend_obj(UniValue::VOBJ);
          for (auto& denom : libzerocoin::zerocoinDenomList) {
              mint_obj.push_back(Pair(strprintf("denom_%d", ZerocoinDenominationToInt(denom)), mapMintCount[denom]));
              spend_obj.push_back(Pair(strprintf("denom_%d", ZerocoinDenominationToInt(denom)), mapSpendCount[denom]));
              pubspend_obj.push_back(Pair(strprintf("denom_%d", ZerocoinDenominationToInt(denom)), mapPublicSpendCount[denom]));
          }
          ret.push_back(Pair("mintcount", mint_obj));
          ret.push_back(Pair("spendcount", spend_obj));
          ret.push_back(Pair("publicspendcount", pubspend_obj));
  
      }
      ret.push_back(Pair("txbytes", (int64_t)nBytes));
      ret.push_back(Pair("ttlfee", FormatMoney(nFees)));
      ret.push_back(Pair("ttlfee_all", FormatMoney(nFees_all)));
      ret.push_back(Pair("feeperkb", FormatMoney(nFeeRate.GetFeePerK())));
  
      return ret;
  
  }
  
  