Signet implementation

contrib/signet/issuer/issuer.sh

@@ -0,0 +1,66 @@
+#!/usr/bin/env bash
+# Copyright (c) 2018 The Bitcoin Core developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+export LC_ALL=C
+
+#
+# Issue blocks using a local node at a given interval.
+#
+
+if [ $# -lt 3 ]; then
+    echo "syntax: $0 <idle time> <bitcoin-cli path> [<bitcoin-cli args>]" ; exit 1
+fi
+
+function log()
+{
+    echo "- $(date +%H:%M:%S): $*"
+}
+
+idletime=$1
+shift
+
+bcli=$1
+shift
+
+if ! [ -e "$bcli" ]; then
+    which "$bcli" &> /dev/null
+    if [ $? -ne 0 ]; then
+        echo "error: unable to find bitcoin binary: $bcli" ; exit 1
+    fi
+fi
+
+echo "- checking node status"
+conns=$($bcli "$@" getconnectioncount)
+
+if [ $? -ne 0 ]; then
+    echo "node error" ; exit 1
+fi
+
+if [ $conns -lt 1 ]; then
+    echo "warning: node is not connected to any other node"
+fi
+
+log "node OK with $conns connection(s)"
+log "mining at maximum capacity with $idletime second delay between each block"
+log "hit ^C to stop"
+
+while true; do
+    log "generating next block"
+    # get address for coinbase output
+    addr=$($bcli "$@" getnewaddress)
+    # create an unsigned, un-PoW'd block
+    unsigned=$($bcli "$@" getnewblockhex $addr)
+    # sign it
+    signed=$($bcli "$@" signblock $unsigned)
+    # grind proof of work; this ends up broadcasting the block, if successful (akin to "generatetoaddress")
+    while true; do
+        blockhash=$($bcli "$@" grindblock $signed 100000000)
+        if [ "$blockhash" = "false" ]; then continue; fi
+        break;
+    done
+    if [ $? -ne 0 ]; then echo "node error; aborting" ; exit 1; fi
+    log "mined block $($bcli "$@" getblockcount) $blockhash to $($bcli "$@" getconnectioncount) peer(s); idling for $idletime seconds"
+    sleep $idletime
+done

src/chainparams.cpp

@@ -17,13 +17,15 @@
 #include <boost/algorithm/string/classification.hpp>
 #include <boost/algorithm/string/split.hpp>
 
-static CBlock CreateGenesisBlock(const char* pszTimestamp, const CScript& genesisOutputScript, uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
+#include <hash.h> // for signet block challenge hash
+
+static CBlock CreateGenesisBlock(const CScript& coinbase_sig, const CScript& genesisOutputScript, uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
 {
     CMutableTransaction txNew;
     txNew.nVersion = 1;
     txNew.vin.resize(1);
     txNew.vout.resize(1);
-    txNew.vin[0].scriptSig = CScript() << 486604799 << CScriptNum(4) << std::vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
+    txNew.vin[0].scriptSig = coinbase_sig;
     txNew.vout[0].nValue = genesisReward;
     txNew.vout[0].scriptPubKey = genesisOutputScript;
 
@@ -38,6 +40,12 @@ static CBlock CreateGenesisBlock(const char* pszTimestamp, const CScript& genesi
     return genesis;
 }
 
+static CBlock CreateGenesisBlock(const char* pszTimestamp, const CScript& genesisOutputScript, uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
+{
+    CScript coinbase_sig = CScript() << 486604799 << CScriptNum(4) << std::vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
+    return CreateGenesisBlock(coinbase_sig, genesisOutputScript, nTime, nNonce, nBits, nVersion, genesisReward);
+}
+
 /**
  * Build the genesis block. Note that the output of its generation
  * transaction cannot be spent since it did not originally exist in the
@@ -268,6 +276,87 @@ class CTestNetParams : public CChainParams {
     }
 };
 
+/**
+ * SigNet version 2018-07-20
+ */
+class SigNetParams : public CChainParams {
+public:
+    SigNetParams(const ArgsManager& args) {
+        if (!args.IsArgSet("-signet_blockscript")) {
+            throw std::runtime_error(strprintf("%s: -signet_blockscript is mandatory for signet networks", __func__));
+        }
+        if (args.GetArgs("-signet_blockscript").size() != 1) {
+            throw std::runtime_error(strprintf("%s: -signet_blockscript cannot be multiple values.", __func__));
+        }
+
+        LogPrintf("SigNet with block script %s\n", gArgs.GetArgs("-signet_blockscript")[0]);
+
+        strNetworkID = "signet";
+        consensus.signature_pow = true;
+        consensus.blockscript = ParseHex(args.GetArgs("-signet_blockscript")[0]);
+        consensus.nSubsidyHalvingInterval = 210000;
+        consensus.BIP34Height = 1;
+        consensus.BIP65Height = 1;
+        consensus.BIP66Height = 1;
+        consensus.nPowTargetTimespan = 14 * 24 * 60 * 60; // two weeks
+        consensus.nPowTargetSpacing = 10 * 60;
+        consensus.fPowAllowMinDifficultyBlocks = false;
+        consensus.fPowNoRetargeting = false;
+        consensus.nRuleChangeActivationThreshold = 1916;
+        consensus.nMinerConfirmationWindow = 2016;
+        consensus.powLimit = uint256S("00002adc28cf53b63c82faa55d83e40ac63b5f100aa5d8df62a429192f9e8ce5");
+        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
+        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 1539478800;
+        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
+
+        // Deployment of BIP68, BIP112, and BIP113.
+        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].bit = 0;
+        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 1539478800;
+        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
+
+        // Deployment of SegWit (BIP141, BIP143, and BIP147)
+        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
+        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = Consensus::BIP9Deployment::ALWAYS_ACTIVE;
+        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = Consensus::BIP9Deployment::NO_TIMEOUT;
+
+        pchMessageStart[0] = 0xf0;
+        pchMessageStart[1] = 0xc7;
+        pchMessageStart[2] = 0x70;
+        pchMessageStart[3] = 0x6a;
+        nDefaultPort = 38333;
+        nPruneAfterHeight = 1000;
+
+        CHashWriter h(SER_DISK, 0);
+        h << consensus.blockscript;
+        uint256 hash = h.GetHash();
+        CScript coinbase_sig = CScript() << std::vector<uint8_t>(hash.begin(), hash.end());
+        CScript genesis_out = CScript() << OP_RETURN;
+        genesis = CreateGenesisBlock(coinbase_sig, genesis_out, 1534313275, 0, 0x1e2adc28, 1, 50 * COIN);
+        consensus.hashGenesisBlock = genesis.GetHash();
+
+        vFixedSeeds.clear();
+        vSeeds.clear();
+        if (args.IsArgSet("-signet_seednode")) {
+            vSeeds = gArgs.GetArgs("-signet_seednode");
+        }
+
+        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>{125};
+        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>{87};
+        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>{217};
+        base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x35, 0x87, 0xCF};
+        base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x35, 0x83, 0x94};
+
+        bech32_hrp = "sb";
+
+        fDefaultConsistencyChecks = false;
+        fRequireStandard = false;
+        fMineBlocksOnDemand = false;
+
+        /* enable fallback fee on signet */
+        m_fallback_fee_enabled = true;
+    }
+};
+
 /**
  * Regression test
  */
@@ -409,6 +498,10 @@ std::unique_ptr<const CChainParams> CreateChainParams(const std::string& chain)
         return std::unique_ptr<CChainParams>(new CTestNetParams());
     else if (chain == CBaseChainParams::REGTEST)
         return std::unique_ptr<CChainParams>(new CRegTestParams(gArgs));
+    else if (chain == CBaseChainParams::SIGNET) {
+        g_solution_blocks = true;
+        return std::unique_ptr<CChainParams>(new SigNetParams(gArgs));
+    }
     throw std::runtime_error(strprintf("%s: Unknown chain %s.", __func__, chain));
 }
 

src/chainparamsbase.cpp

@@ -13,6 +13,7 @@
 
 const std::string CBaseChainParams::MAIN = "main";
 const std::string CBaseChainParams::TESTNET = "test";
+const std::string CBaseChainParams::SIGNET = "signet";
 const std::string CBaseChainParams::REGTEST = "regtest";
 
 void SetupChainParamsBaseOptions()
@@ -21,6 +22,9 @@ void SetupChainParamsBaseOptions()
                                    "This is intended for regression testing tools and app development.", true, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-testnet", "Use the test chain", false, OptionsCategory::CHAINPARAMS);
     gArgs.AddArg("-vbparams=deployment:start:end", "Use given start/end times for specified version bits deployment (regtest-only)", true, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-signet", "Use the signet chain. Note that the network is defined by the signet_blockscript parameter", false, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-signet_blockscript", "Blocks must satisfy the given script to be considered valid (only for -signet networks)", false, OptionsCategory::CHAINPARAMS);
+    gArgs.AddArg("-signet_seednode", "Specify a seed node for the signet network (may be used multiple times to specify multiple seed nodes)", false, OptionsCategory::CHAINPARAMS);
 }
 
 static std::unique_ptr<CBaseChainParams> globalChainBaseParams;
@@ -39,8 +43,9 @@ std::unique_ptr<CBaseChainParams> CreateBaseChainParams(const std::string& chain
         return MakeUnique<CBaseChainParams>("testnet3", 18332);
     else if (chain == CBaseChainParams::REGTEST)
         return MakeUnique<CBaseChainParams>("regtest", 18443);
-    else
-        throw std::runtime_error(strprintf("%s: Unknown chain %s.", __func__, chain));
+    else if (chain == CBaseChainParams::SIGNET)
+        return MakeUnique<CBaseChainParams>("signet", 38332);
+    throw std::runtime_error(strprintf("%s: Unknown chain %s.", __func__, chain));
 }
 
 void SelectBaseParams(const std::string& chain)

src/chainparamsbase.h

@@ -16,9 +16,10 @@
 class CBaseChainParams
 {
 public:
-    /** BIP70 chain name strings (main, test or regtest) */
+    /** BIP70 chain name strings (main, test, sigtest or regtest) */
     static const std::string MAIN;
     static const std::string TESTNET;
+    static const std::string SIGNET;
     static const std::string REGTEST;
 
     const std::string& DataDir() const { return strDataDir; }

src/consensus/params.h

@@ -75,6 +75,9 @@ struct Params {
     int64_t DifficultyAdjustmentInterval() const { return nPowTargetTimespan / nPowTargetSpacing; }
     uint256 nMinimumChainWork;
     uint256 defaultAssumeValid;
+
+    bool signature_pow{false};
+    std::vector<uint8_t> blockscript;
 };
 } // namespace Consensus
 

src/miner.cpp

@@ -45,6 +45,10 @@ int64_t UpdateTime(CBlockHeader* pblock, const Consensus::Params& consensusParam
 BlockAssembler::Options::Options() {
     blockMinFeeRate = CFeeRate(DEFAULT_BLOCK_MIN_TX_FEE);
     nBlockMaxWeight = DEFAULT_BLOCK_MAX_WEIGHT;
+
+    // Make room for the signet extension in the witness commitment, if this
+    // is a signet block (4 byte magic, 2 byte size, 64 byte signature (TODO: determine if this should be given, e.g. for multisig nets))
+    if (g_solution_blocks) nBlockMaxWeight -= 4 + 2 + 64;
 }
 
 BlockAssembler::BlockAssembler(const CChainParams& params, const Options& options) : chainparams(params)
@@ -165,7 +169,7 @@ std::unique_ptr<CBlockTemplate> BlockAssembler::CreateNewBlock(const CScript& sc
     pblocktemplate->vTxSigOpsCost[0] = WITNESS_SCALE_FACTOR * GetLegacySigOpCount(*pblock->vtx[0]);
 
     CValidationState state;
-    if (!TestBlockValidity(state, chainparams, *pblock, pindexPrev, false, false)) {
+    if (!TestBlockValidity(state, chainparams, *pblock, false, false)) {
         throw std::runtime_error(strprintf("%s: TestBlockValidity failed: %s", __func__, FormatStateMessage(state)));
     }
     int64_t nTime2 = GetTimeMicros();

src/policy/policy.cpp

@@ -10,6 +10,7 @@
 #include <consensus/validation.h>
 #include <coins.h>
 
+unsigned int GetStandardScriptVerifyFlags() { return STANDARD_SCRIPT_VERIFY_FLAGS; }
 
 CAmount GetDustThreshold(const CTxOut& txout, const CFeeRate& dustRelayFeeIn)
 {

src/policy/policy.h

@@ -70,6 +70,8 @@ static constexpr unsigned int STANDARD_SCRIPT_VERIFY_FLAGS = MANDATORY_SCRIPT_VE
                                                              SCRIPT_VERIFY_WITNESS_PUBKEYTYPE |
                                                              SCRIPT_VERIFY_CONST_SCRIPTCODE;
 
+unsigned int GetStandardScriptVerifyFlags();
+
 /** For convenience, standard but not mandatory verify flags. */
 static constexpr unsigned int STANDARD_NOT_MANDATORY_VERIFY_FLAGS = STANDARD_SCRIPT_VERIFY_FLAGS & ~MANDATORY_SCRIPT_VERIFY_FLAGS;
 

src/pow.cpp

@@ -9,6 +9,9 @@
 #include <chain.h>
 #include <primitives/block.h>
 #include <uint256.h>
+#include <script/interpreter.h>
+
+unsigned int GetStandardScriptVerifyFlags();
 
 unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHeader *pblock, const Consensus::Params& params)
 {
@@ -71,7 +74,7 @@ unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nF
     return bnNew.GetCompact();
 }
 
-bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params& params)
+bool CheckProofOfWork(const uint256& hash, unsigned int nBits, const Consensus::Params& params)
 {
     bool fNegative;
     bool fOverflow;
@@ -89,3 +92,11 @@ bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params&
 
     return true;
 }
+
+bool CheckBlockSolution(const uint256& signet_hash, const std::vector<uint8_t>& signature, const Consensus::Params& params)
+{
+    SimpleSignatureChecker bsc(signet_hash);
+    CScript solution = CScript(signature.begin(), signature.end());
+    CScript challenge = CScript(params.blockscript.begin(), params.blockscript.end());
+    return VerifyScript(solution, challenge, nullptr, GetStandardScriptVerifyFlags(), bsc);
+}

src/pow.h

@@ -18,6 +18,9 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
 unsigned int CalculateNextWorkRequired(const CBlockIndex* pindexLast, int64_t nFirstBlockTime, const Consensus::Params&);
 
 /** Check whether a block hash satisfies the proof-of-work requirement specified by nBits */
-bool CheckProofOfWork(uint256 hash, unsigned int nBits, const Consensus::Params&);
+bool CheckProofOfWork(const uint256& hash, unsigned int nBits, const Consensus::Params&);
+
+/** Signet: Check whether a block has a valid solution */
+bool CheckBlockSolution(const uint256& signet_hash, const std::vector<uint8_t>& signature, const Consensus::Params&);
 
 #endif // BITCOIN_POW_H