src/rpcmining.cpp

   1 // Copyright (c) 2010 Satoshi Nakamoto
   2 // Copyright (c) 2009-2012 The Bitcoin developers
   3 // Distributed under the MIT/X11 software license, see the accompanying
   4 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
   5
   6 #include "main.h"
   7 #include "db.h"
   8 #include "txdb.h"
   9 #include "init.h"
  10 #include "miner.h"
  11 #include "kernel.h"
  12 #include "bitcoinrpc.h"
  13
  14 using namespace json_spirit;
  15 using namespace std;
  16
  17 extern uint256 nPoWBase;
  18 extern uint64_t nStakeInputsMapSize;
  19
  20 Value getsubsidy(const Array& params, bool fHelp)
  21 {
  22     if (fHelp || params.size() > 1)
  23         throw runtime_error(
  24             "getsubsidy [nTarget]\n"
  25             "Returns proof-of-work subsidy value for the specified value of target.");
  26
  27     unsigned int nBits = 0;
  28
  29     if (params.size() != 0)
  30     {
  31         CBigNum bnTarget(uint256(params[0].get_str()));
  32         nBits = bnTarget.GetCompact();
  33     }
  34     else
  35     {
  36         nBits = GetNextTargetRequired(pindexBest, false);
  37     }
  38
  39     return (uint64_t)GetProofOfWorkReward(nBits);
  40 }
  41
  42 Value getmininginfo(const Array& params, bool fHelp)
  43 {
  44     if (fHelp || params.size() != 0)
  45         throw runtime_error(
  46             "getmininginfo\n"
  47             "Returns an object containing mining-related information.");
  48
  49     Object obj, diff, weight;
  50     obj.push_back(Pair("blocks",        (int)nBestHeight));
  51     obj.push_back(Pair("currentblocksize",(uint64_t)nLastBlockSize));
  52     obj.push_back(Pair("currentblocktx",(uint64_t)nLastBlockTx));
  53
  54     diff.push_back(Pair("proof-of-work",        GetDifficulty()));
  55     diff.push_back(Pair("proof-of-stake",       GetDifficulty(GetLastBlockIndex(pindexBest, true))));
  56     diff.push_back(Pair("search-interval",      (int)nLastCoinStakeSearchInterval));
  57     obj.push_back(Pair("difficulty",    diff));
  58
  59     obj.push_back(Pair("blockvalue",    (uint64_t)GetProofOfWorkReward(GetLastBlockIndex(pindexBest, false)->nBits)));
  60     obj.push_back(Pair("netmhashps",    GetPoWMHashPS()));
  61     obj.push_back(Pair("netstakeweight",GetPoSKernelPS()));
  62     obj.push_back(Pair("errors",        GetWarnings("statusbar")));
  63     obj.push_back(Pair("pooledtx",      (uint64_t)mempool.size()));
  64
  65     obj.push_back(Pair("stakeinputs",   (uint64_t)nStakeInputsMapSize));
  66     obj.push_back(Pair("stakeinterest", GetProofOfStakeReward(0, GetLastBlockIndex(pindexBest, true)->nBits, GetLastBlockIndex(pindexBest, true)->nTime, true)));
  67
  68     obj.push_back(Pair("testnet",       fTestNet));
  69     return obj;
  70 }
  71
  72 Value scaninput(const Array& params, bool fHelp)
  73 {
  74     if (fHelp || params.size() > 4 || params.size() < 2)
  75         throw runtime_error(
  76             "scaninput <txid> <nout> [difficulty] [days]\n"
  77             "Scan specified input for suitable kernel solutions.\n"
  78             "    [difficulty] - upper limit for difficulty, current difficulty by default;\n"
  79             "    [days] - time window, 365 days by default.\n"
  80         );
  81
  82
  83     uint256 hash;
  84     hash.SetHex(params[0].get_str());
  85
  86     uint32_t nOut = params[1].get_int(), nBits = GetNextTargetRequired(pindexBest, true), nDays = 365;
  87
  88     if (params.size() > 2)
  89     {
  90         CBigNum bnTarget(nPoWBase);
  91         bnTarget *= 1000;
  92         bnTarget /= (int) (params[2].get_real() * 1000);
  93         nBits = bnTarget.GetCompact();
  94     }
  95
  96     if (params.size() > 3)
  97     {
  98         nDays = params[3].get_int();
  99     }
 100
 101     CTransaction tx;
 102     uint256 hashBlock = 0;
 103     if (GetTransaction(hash, tx, hashBlock))
 104     {
 105         if (nOut > tx.vout.size())
 106             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Incorrect output number");
 107
 108         if (hashBlock == 0)
 109             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Unable to find transaction in the blockchain");
 110
 111         CTxDB txdb("r");
 112
 113         CBlock block;
 114         CTxIndex txindex;
 115
 116         // Load transaction index item
 117         if (!txdb.ReadTxIndex(tx.GetHash(), txindex))
 118             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "Unable to read block index item");
 119
 120         // Read block header
 121         if (!block.ReadFromDisk(txindex.pos.nFile, txindex.pos.nBlockPos, false))
 122             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "CBlock::ReadFromDisk() failed");
 123
 124         uint64_t nStakeModifier = 0;
 125         if (!GetKernelStakeModifier(block.GetHash(), nStakeModifier))
 126             throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "No kernel stake modifier generated yet");
 127
 128         std::pair<uint32_t, uint32_t> interval;
 129         interval.first = GetTime();
 130         // Only count coins meeting min age requirement
 131         if (nStakeMinAge + block.nTime > interval.first)
 132             interval.first += (nStakeMinAge + block.nTime - interval.first);
 133         interval.second = interval.first + nDays * 86400;
 134
 135         // Build static part of kernel
 136         CDataStream ssKernel(SER_GETHASH, 0);
 137         ssKernel << nStakeModifier;
 138         ssKernel << block.nTime << (txindex.pos.nTxPos - txindex.pos.nBlockPos) << tx.nTime << nOut;
 139         CDataStream::const_iterator itK = ssKernel.begin();
 140
 141         std::vector<std::pair<uint256, uint32_t> > solutions;
 142         if (ScanKernelForward((unsigned char *)&itK[0], nBits, tx.nTime, tx.vout[nOut].nValue, interval, solutions))
 143         {
 144             Array results;
 145
 146             BOOST_FOREACH(const PAIRTYPE(uint256, uint32_t) solution, solutions)
 147             {
 148
 149                 Object item;
 150                 item.push_back(Pair("hash", solution.first.GetHex()));
 151                 item.push_back(Pair("time", DateTimeStrFormat(solution.second)));
 152
 153                 results.push_back(item);
 154             }
 155
 156             return results;
 157         }
 158     }
 159     else
 160         throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, "No information available about transaction");
 161
 162     return Value::null;
 163 }
 164
 165 Value getworkex(const Array& params, bool fHelp)
 166 {
 167     if (fHelp || params.size() > 2)
 168         throw runtime_error(
 169             "getworkex [data, coinbase]\n"
 170             "If [data, coinbase] is not specified, returns extended work data.\n"
 171         );
 172
 173     if (vNodes.empty())
 174         throw JSONRPCError(-9, "NovaCoin is not connected!");
 175
 176     if (IsInitialBlockDownload())
 177         throw JSONRPCError(-10, "NovaCoin is downloading blocks...");
 178
 179     typedef map<uint256, pair<CBlock*, CScript> > mapNewBlock_t;
 180     static mapNewBlock_t mapNewBlock;
 181     static vector<CBlock*> vNewBlock;
 182     static CReserveKey reservekey(pwalletMain);
 183
 184     if (params.size() == 0)
 185     {
 186         // Update block
 187         static unsigned int nTransactionsUpdatedLast;
 188         static CBlockIndex* pindexPrev;
 189         static int64_t nStart;
 190         static CBlock* pblock;
 191         if (pindexPrev != pindexBest ||
 192             (nTransactionsUpdated != nTransactionsUpdatedLast && GetTime() - nStart > 60))
 193         {
 194             if (pindexPrev != pindexBest)
 195             {
 196                 // Deallocate old blocks since they're obsolete now
 197                 mapNewBlock.clear();
 198                 BOOST_FOREACH(CBlock* pblock, vNewBlock)
 199                     delete pblock;
 200                 vNewBlock.clear();
 201             }
 202             nTransactionsUpdatedLast = nTransactionsUpdated;
 203             pindexPrev = pindexBest;
 204             nStart = GetTime();
 205
 206             // Create new block
 207             pblock = CreateNewBlock(pwalletMain);
 208             if (!pblock)
 209                 throw JSONRPCError(-7, "Out of memory");
 210             vNewBlock.push_back(pblock);
 211         }
 212
 213         // Update nTime
 214         pblock->nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
 215         pblock->nNonce = 0;
 216
 217         // Update nExtraNonce
 218         static unsigned int nExtraNonce = 0;
 219         IncrementExtraNonce(pblock, pindexPrev, nExtraNonce);
 220
 221         // Save
 222         mapNewBlock[pblock->hashMerkleRoot] = make_pair(pblock, pblock->vtx[0].vin[0].scriptSig);
 223
 224         // Prebuild hash buffers
 225         char pmidstate[32];
 226         char pdata[128];
 227         char phash1[64];
 228         FormatHashBuffers(pblock, pmidstate, pdata, phash1);
 229
 230         uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
 231
 232         CTransaction coinbaseTx = pblock->vtx[0];
 233         std::vector<uint256> merkle = pblock->GetMerkleBranch(0);
 234
 235         Object result;
 236         result.push_back(Pair("data",     HexStr(BEGIN(pdata), END(pdata))));
 237         result.push_back(Pair("target",   HexStr(BEGIN(hashTarget), END(hashTarget))));
 238
 239         CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
 240         ssTx << coinbaseTx;
 241         result.push_back(Pair("coinbase", HexStr(ssTx.begin(), ssTx.end())));
 242
 243         Array merkle_arr;
 244
 245         BOOST_FOREACH(uint256 merkleh, merkle) {
 246             merkle_arr.push_back(HexStr(BEGIN(merkleh), END(merkleh)));
 247         }
 248
 249         result.push_back(Pair("merkle", merkle_arr));
 250
 251
 252         return result;
 253     }
 254     else
 255     {
 256         // Parse parameters
 257         vector<unsigned char> vchData = ParseHex(params[0].get_str());
 258         vector<unsigned char> coinbase;
 259
 260         if(params.size() == 2)
 261             coinbase = ParseHex(params[1].get_str());
 262
 263         if (vchData.size() != 128)
 264             throw JSONRPCError(-8, "Invalid parameter");
 265
 266         CBlock* pdata = (CBlock*)&vchData[0];
 267
 268         // Byte reverse
 269         for (int i = 0; i < 128/4; i++)
 270             ((unsigned int*)pdata)[i] = ByteReverse(((unsigned int*)pdata)[i]);
 271
 272         // Get saved block
 273         if (!mapNewBlock.count(pdata->hashMerkleRoot))
 274             return false;
 275         CBlock* pblock = mapNewBlock[pdata->hashMerkleRoot].first;
 276
 277         pblock->nTime = pdata->nTime;
 278         pblock->nNonce = pdata->nNonce;
 279
 280         if(coinbase.size() == 0)
 281             pblock->vtx[0].vin[0].scriptSig = mapNewBlock[pdata->hashMerkleRoot].second;
 282         else
 283             CDataStream(coinbase, SER_NETWORK, PROTOCOL_VERSION) >> pblock->vtx[0]; // FIXME - HACK!
 284
 285         pblock->hashMerkleRoot = pblock->BuildMerkleTree();
 286
 287         return CheckWork(pblock, *pwalletMain, reservekey);
 288     }
 289 }
 290
 291
 292 Value getwork(const Array& params, bool fHelp)
 293 {
 294     if (fHelp || params.size() > 1)
 295         throw runtime_error(
 296             "getwork [data]\n"
 297             "If [data] is not specified, returns formatted hash data to work on:\n"
 298             "  \"midstate\" : precomputed hash state after hashing the first half of the data (DEPRECATED)\n" // deprecated
 299             "  \"data\" : block data\n"
 300             "  \"hash1\" : formatted hash buffer for second hash (DEPRECATED)\n" // deprecated
 301             "  \"target\" : little endian hash target\n"
 302             "If [data] is specified, tries to solve the block and returns true if it was successful.");
 303
 304     if (vNodes.empty())
 305         throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "NovaCoin is not connected!");
 306
 307     if (IsInitialBlockDownload())
 308         throw JSONRPCError(RPC_CLIENT_IN_INITIAL_DOWNLOAD, "NovaCoin is downloading blocks...");
 309
 310     typedef map<uint256, pair<CBlock*, CScript> > mapNewBlock_t;
 311     static mapNewBlock_t mapNewBlock;    // FIXME: thread safety
 312     static vector<CBlock*> vNewBlock;
 313     static CReserveKey reservekey(pwalletMain);
 314
 315     if (params.size() == 0)
 316     {
 317         // Update block
 318         static unsigned int nTransactionsUpdatedLast;
 319         static CBlockIndex* pindexPrev;
 320         static int64_t nStart;
 321         static CBlock* pblock;
 322         if (pindexPrev != pindexBest ||
 323             (nTransactionsUpdated != nTransactionsUpdatedLast && GetTime() - nStart > 60))
 324         {
 325             if (pindexPrev != pindexBest)
 326             {
 327                 // Deallocate old blocks since they're obsolete now
 328                 mapNewBlock.clear();
 329                 BOOST_FOREACH(CBlock* pblock, vNewBlock)
 330                     delete pblock;
 331                 vNewBlock.clear();
 332             }
 333
 334             // Clear pindexPrev so future getworks make a new block, despite any failures from here on
 335             pindexPrev = NULL;
 336
 337             // Store the pindexBest used before CreateNewBlock, to avoid races
 338             nTransactionsUpdatedLast = nTransactionsUpdated;
 339             CBlockIndex* pindexPrevNew = pindexBest;
 340             nStart = GetTime();
 341
 342             // Create new block
 343             pblock = CreateNewBlock(pwalletMain);
 344             if (!pblock)
 345                 throw JSONRPCError(RPC_OUT_OF_MEMORY, "Out of memory");
 346             vNewBlock.push_back(pblock);
 347
 348             // Need to update only after we know CreateNewBlock succeeded
 349             pindexPrev = pindexPrevNew;
 350         }
 351
 352         // Update nTime
 353         pblock->UpdateTime(pindexPrev);
 354         pblock->nNonce = 0;
 355
 356         // Update nExtraNonce
 357         static unsigned int nExtraNonce = 0;
 358         IncrementExtraNonce(pblock, pindexPrev, nExtraNonce);
 359
 360         // Save
 361         mapNewBlock[pblock->hashMerkleRoot] = make_pair(pblock, pblock->vtx[0].vin[0].scriptSig);
 362
 363         // Pre-build hash buffers
 364         char pmidstate[32];
 365         char pdata[128];
 366         char phash1[64];
 367         FormatHashBuffers(pblock, pmidstate, pdata, phash1);
 368
 369         uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
 370
 371         Object result;
 372         result.push_back(Pair("midstate", HexStr(BEGIN(pmidstate), END(pmidstate)))); // deprecated
 373         result.push_back(Pair("data",     HexStr(BEGIN(pdata), END(pdata))));
 374         result.push_back(Pair("hash1",    HexStr(BEGIN(phash1), END(phash1)))); // deprecated
 375         result.push_back(Pair("target",   HexStr(BEGIN(hashTarget), END(hashTarget))));
 376         return result;
 377     }
 378     else
 379     {
 380         // Parse parameters
 381         vector<unsigned char> vchData = ParseHex(params[0].get_str());
 382         if (vchData.size() != 128)
 383             throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid parameter");
 384         CBlock* pdata = (CBlock*)&vchData[0];
 385
 386         // Byte reverse
 387         for (int i = 0; i < 128/4; i++)
 388             ((unsigned int*)pdata)[i] = ByteReverse(((unsigned int*)pdata)[i]);
 389
 390         // Get saved block
 391         if (!mapNewBlock.count(pdata->hashMerkleRoot))
 392             return false;
 393         CBlock* pblock = mapNewBlock[pdata->hashMerkleRoot].first;
 394
 395         pblock->nTime = pdata->nTime;
 396         pblock->nNonce = pdata->nNonce;
 397         pblock->vtx[0].vin[0].scriptSig = mapNewBlock[pdata->hashMerkleRoot].second;
 398         pblock->hashMerkleRoot = pblock->BuildMerkleTree();
 399
 400         return CheckWork(pblock, *pwalletMain, reservekey);
 401     }
 402 }
 403
 404
 405 Value getblocktemplate(const Array& params, bool fHelp)
 406 {
 407     if (fHelp || params.size() > 1)
 408         throw runtime_error(
 409             "getblocktemplate [params]\n"
 410             "Returns data needed to construct a block to work on:\n"
 411             "  \"version\" : block version\n"
 412             "  \"previousblockhash\" : hash of current highest block\n"
 413             "  \"transactions\" : contents of non-coinbase transactions that should be included in the next block\n"
 414             "  \"coinbaseaux\" : data that should be included in coinbase\n"
 415             "  \"coinbasevalue\" : maximum allowable input to coinbase transaction, including the generation award and transaction fees\n"
 416             "  \"target\" : hash target\n"
 417             "  \"mintime\" : minimum timestamp appropriate for next block\n"
 418             "  \"curtime\" : current timestamp\n"
 419             "  \"mutable\" : list of ways the block template may be changed\n"
 420             "  \"noncerange\" : range of valid nonces\n"
 421             "  \"sigoplimit\" : limit of sigops in blocks\n"
 422             "  \"sizelimit\" : limit of block size\n"
 423             "  \"bits\" : compressed target of next block\n"
 424             "  \"height\" : height of the next block\n"
 425             "See https://en.bitcoin.it/wiki/BIP_0022 for full specification.");
 426
 427     std::string strMode = "template";
 428     if (params.size() > 0)
 429     {
 430         const Object& oparam = params[0].get_obj();
 431         const Value& modeval = find_value(oparam, "mode");
 432         if (modeval.type() == str_type)
 433             strMode = modeval.get_str();
 434         else if (modeval.type() == null_type)
 435         {
 436             /* Do nothing */
 437         }
 438         else
 439             throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid mode");
 440     }
 441
 442     if (strMode != "template")
 443         throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid mode");
 444
 445     if (vNodes.empty())
 446         throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "NovaCoin is not connected!");
 447
 448     if (IsInitialBlockDownload())
 449         throw JSONRPCError(RPC_CLIENT_IN_INITIAL_DOWNLOAD, "NovaCoin is downloading blocks...");
 450
 451     static CReserveKey reservekey(pwalletMain);
 452
 453     // Update block
 454     static unsigned int nTransactionsUpdatedLast;
 455     static CBlockIndex* pindexPrev;
 456     static int64_t nStart;
 457     static CBlock* pblock;
 458     if (pindexPrev != pindexBest ||
 459         (nTransactionsUpdated != nTransactionsUpdatedLast && GetTime() - nStart > 5))
 460     {
 461         // Clear pindexPrev so future calls make a new block, despite any failures from here on
 462         pindexPrev = NULL;
 463
 464         // Store the pindexBest used before CreateNewBlock, to avoid races
 465         nTransactionsUpdatedLast = nTransactionsUpdated;
 466         CBlockIndex* pindexPrevNew = pindexBest;
 467         nStart = GetTime();
 468
 469         // Create new block
 470         if(pblock)
 471         {
 472             delete pblock;
 473             pblock = NULL;
 474         }
 475         pblock = CreateNewBlock(pwalletMain);
 476         if (!pblock)
 477             throw JSONRPCError(RPC_OUT_OF_MEMORY, "Out of memory");
 478
 479         // Need to update only after we know CreateNewBlock succeeded
 480         pindexPrev = pindexPrevNew;
 481     }
 482
 483     // Update nTime
 484     pblock->UpdateTime(pindexPrev);
 485     pblock->nNonce = 0;
 486
 487     Array transactions;
 488     map<uint256, int64_t> setTxIndex;
 489     int i = 0;
 490     CTxDB txdb("r");
 491     BOOST_FOREACH (CTransaction& tx, pblock->vtx)
 492     {
 493         uint256 txHash = tx.GetHash();
 494         setTxIndex[txHash] = i++;
 495
 496         if (tx.IsCoinBase() || tx.IsCoinStake())
 497             continue;
 498
 499         Object entry;
 500
 501         CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
 502         ssTx << tx;
 503         entry.push_back(Pair("data", HexStr(ssTx.begin(), ssTx.end())));
 504
 505         entry.push_back(Pair("hash", txHash.GetHex()));
 506
 507         MapPrevTx mapInputs;
 508         map<uint256, CTxIndex> mapUnused;
 509         bool fInvalid = false;
 510         if (tx.FetchInputs(txdb, mapUnused, false, false, mapInputs, fInvalid))
 511         {
 512             entry.push_back(Pair("fee", (int64_t)(tx.GetValueIn(mapInputs) - tx.GetValueOut())));
 513
 514             Array deps;
 515             BOOST_FOREACH (MapPrevTx::value_type& inp, mapInputs)
 516             {
 517                 if (setTxIndex.count(inp.first))
 518                     deps.push_back(setTxIndex[inp.first]);
 519             }
 520             entry.push_back(Pair("depends", deps));
 521
 522             int64_t nSigOps = tx.GetLegacySigOpCount();
 523             nSigOps += tx.GetP2SHSigOpCount(mapInputs);
 524             entry.push_back(Pair("sigops", nSigOps));
 525         }
 526
 527         transactions.push_back(entry);
 528     }
 529
 530     Object aux;
 531     aux.push_back(Pair("flags", HexStr(COINBASE_FLAGS.begin(), COINBASE_FLAGS.end())));
 532
 533     uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
 534
 535     static Array aMutable;
 536     if (aMutable.empty())
 537     {
 538         aMutable.push_back("time");
 539         aMutable.push_back("transactions");
 540         aMutable.push_back("prevblock");
 541     }
 542
 543     Object result;
 544     result.push_back(Pair("version", pblock->nVersion));
 545     result.push_back(Pair("previousblockhash", pblock->hashPrevBlock.GetHex()));
 546     result.push_back(Pair("transactions", transactions));
 547     result.push_back(Pair("coinbaseaux", aux));
 548     result.push_back(Pair("coinbasevalue", (int64_t)pblock->vtx[0].vout[0].nValue));
 549     result.push_back(Pair("target", hashTarget.GetHex()));
 550     result.push_back(Pair("mintime", (int64_t)pindexPrev->GetMedianTimePast()+1));
 551     result.push_back(Pair("mutable", aMutable));
 552     result.push_back(Pair("noncerange", "00000000ffffffff"));
 553     result.push_back(Pair("sigoplimit", (int64_t)MAX_BLOCK_SIGOPS));
 554     result.push_back(Pair("sizelimit", (int64_t)MAX_BLOCK_SIZE));
 555     result.push_back(Pair("curtime", (int64_t)pblock->nTime));
 556     result.push_back(Pair("bits", HexBits(pblock->nBits)));
 557     result.push_back(Pair("height", (int64_t)(pindexPrev->nHeight+1)));
 558
 559     return result;
 560 }
 561
 562 Value submitblock(const Array& params, bool fHelp)
 563 {
 564     if (fHelp || params.size() < 1 || params.size() > 2)
 565         throw runtime_error(
 566             "submitblock <hex data> [optional-params-obj]\n"
 567             "[optional-params-obj] parameter is currently ignored.\n"
 568             "Attempts to submit new block to network.\n"
 569             "See https://en.bitcoin.it/wiki/BIP_0022 for full specification.");
 570
 571     vector<unsigned char> blockData(ParseHex(params[0].get_str()));
 572     CDataStream ssBlock(blockData, SER_NETWORK, PROTOCOL_VERSION);
 573     CBlock block;
 574     try {
 575         ssBlock >> block;
 576     }
 577     catch (const std::exception&) {
 578         throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Block decode failed");
 579     }
 580
 581     bool fAccepted = ProcessBlock(NULL, &block);
 582     if (!fAccepted)
 583         return "rejected";
 584
 585     return Value::null;
 586 }
 587