Bitcoin Forum

Please advise me...
I have been suffering from this problem for almost 4 months now.

I'm trying to clone bitcoin.
I can't change the genesis block.

I used GenesisH0 to create a Genesis block as follows

$ python genesis.py -a SHA256 -z "06/06/2021" -t 1622938707 -n 1158615860

The output was as follows



04ffff001d01040a30362f30362f32303231
algorithm: SHA256
merkle hash: 200f703ffe7f3580d3a38309b207f76f1ab21db7bb4acd97656ba5518d7543ce
pszTimestamp: 06/06/2021
pubkey: 04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef3 8c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f
time: 1622938707
bits: 0x1d00ffff
Searching for genesis hash..
genesis hash found!
nonce: 1158615860
genesis hash: 000000003a3f2fd0e716571a94390b055c6c6388739845dd7bd66c3de04d2d13

====


Using this data, I pasted in the following.

        genesis = CreateGenesisBlock(1622938707, 1158615860, 0x1d00ffff, 1, 50 * COIN);
        consensus.hashGenesisBlock = genesis.GetHash();
        assert(consensus.hashGenesisBlock == uint256S("0x000000003a3f2fd0e716571a94390b055c6c6388739845dd7bd66c3de04d2d13"));
        assert(genesis.hashMerkleRoot == uint256S("0x200f703ffe7f3580d3a38309b207f76f1ab21db7bb4acd97656ba5518d7543ce"));

====

and

$ make
$ ./testcoind


Then, I get the following error message.

testcoind: chainparams.cpp:129: CMainParams::CMainParams(): Assertion `consensus.hashGenesisBlock == uint256S("0x000000003a3f2fd0e716571a94390b055c6c6388739845dd7bd66c3de04d2d13")' failed.
Aborted (core dumped)


All the code is below.
I would appreciate your advice. Thanks.



======

static CBlock CreateGenesisBlock(uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
{
    const char* pszTimestamp = "06/06/2021";
    const CScript genesisOutputScript = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef3 8c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
    return CreateGenesisBlock(pszTimestamp, genesisOutputScript, nTime, nNonce, nBits, nVersion, genesisReward);
}

void CChainParams::UpdateVersionBitsParameters(Consensus::DeploymentPos d, int64_t nStartTime, int64_t nTimeout)
{
    consensus.vDeployments[d].nStartTime = nStartTime;
    consensus.vDeployments[d].nTimeout = nTimeout;
}





class CMainParams : public CChainParams {
public:
    CMainParams() {
        strNetworkID = "main";
        consensus.nSubsidyHalvingInterval = 210000;
        consensus.BIP16Height = 0; // 00000000000000ce80a7e057163a4db1d5ad7b20fb6f598c9597b9665c8fb0d4 - April 1, 2012
        consensus.BIP34Height = 0;
        consensus.BIP34Hash = uint256S("0x000000000000024b89b42a942fe0d9fea3bb44ab7bd1b19115dd6a759c0808b8");
        consensus.BIP65Height = 0; // 000000000000000004c2b624ed5d7756c508d90fd0da2c7c679febfa6c4735f0
        consensus.BIP66Height = 0; // 00000000000000000379eaa19dce8c9b722d46ae6a57c2f1a988119488b50931
        consensus.powLimit = uint256S("00000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
        consensus.nPowTargetTimespan = 3.5 * 24 * 60 * 60; // two weeks
        consensus.nPowTargetSpacing = 2.5 * 60;
        consensus.fPowAllowMinDifficultyBlocks = false;
        consensus.fPowNoRetargeting = false;
        consensus.nRuleChangeActivationThreshold = 1916; // 95% of 2016
        consensus.nMinerConfirmationWindow = 2016; // nPowTargetTimespan / nPowTargetSpacing
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].bit = 28;
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nStartTime = 1199145601; // January 1, 2008
        consensus.vDeployments[Consensus::DEPLOYMENT_TESTDUMMY].nTimeout = 1230767999; // December 31, 2008

        // Deployment of BIP68, BIP112, and BIP113.
        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].bit = 0;
        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nStartTime = 1462060800; // May 1st, 2016
        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1493596800; // May 1st, 2017

        // Deployment of SegWit (BIP141, BIP143, and BIP147)
        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1479168000; // November 15th, 2016.
        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1510704000; // November 15th, 2017.

        // The best chain should have at least this much work.
        consensus.nMinimumChainWork = uint256S("0x00");

        // By default assume that the signatures in ancestors of this block are valid.
        consensus.defaultAssumeValid = uint256S("0x0000000000000000005214481d2d96f898e3d5416e43359c145944a909d242e0"); //506067

        /**
         * The message start string is designed to be unlikely to occur in normal data.
         * The characters are rarely used upper ASCII, not valid as UTF-8, and produce
         * a large 32-bit integer with any alignment.
         */
        pchMessageStart[0] = 0xcc;
        pchMessageStart[1] = 0x54;
        pchMessageStart[2] = 0x36;
        pchMessageStart[3] = 0x64;

        nDefaultPort = 9191;
        nPruneAfterHeight = 100000;

        genesis = CreateGenesisBlock(1622938707, 1158615860, 0x1d00ffff, 1, 50 * COIN);
        consensus.hashGenesisBlock = genesis.GetHash();
        assert(consensus.hashGenesisBlock == uint256S("0x000000003a3f2fd0e716571a94390b055c6c6388739845dd7bd66c3de04d2d13"));
        assert(genesis.hashMerkleRoot == uint256S("0x200f703ffe7f3580d3a38309b207f76f1ab21db7bb4acd97656ba5518d7543ce"));


        // Note that of those which support the service bits prefix, most only support a subset of
        // possible options.
        // This is fine at runtime as we'll fall back to using them as a oneshot if they dont support the
        // service bits we want, but we should get them updated to support all service bits wanted by any
        // release ASAP to avoid it where possible.
        vSeeds.emplace_back("80.211.145.197");
        vSeeds.emplace_back("80.211.146.33");

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,48);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,80);
        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,33);
        base58Prefixes[EXT_PUBLIC_KEY] = {0x1e, 0x88, 0xB2, 0x1E};
        base58Prefixes[EXT_SECRET_KEY] = {0x1e, 0x88, 0xAD, 0xE4};

        bech32_hrp = "bc";

        vFixedSeeds = std::vector<SeedSpec6>(pnSeed6_main, pnSeed6_main + ARRAYLEN(pnSeed6_main));

        fDefaultConsistencyChecks = false;
        fRequireStandard = true;
        fMineBlocksOnDemand = false;

        checkpointData = {
            {
            }
        };

        chainTxData = ChainTxData{
            // Data as of block 0000000000000000002d6cca6761c99b3c2e936f9a0e304b7c7651a993f461de (height 506081).
            1516903077, // * UNIX timestamp of last known number of transactions
            295363220,  // * total number of transactions between genesis and that timestamp
                        //   (the tx=... number in the SetBestChain debug.log lines)
            3.5         // * estimated number of transactions per second after that timestamp
        };
    }
};

I don't know GenesisH0, but I remember that I was also facing problems when I tried to replace the genesis block. I achieved it by using Remember remember the 5th of November (https://bitcointalk.org/index.php?action=profile;u=13942)'s Genesis Block Generator (https://bitcointalk.org/index.php?topic=181981.0). I realized that the issue was coming from the genesis.hashMerkleRoot; I had to replace it with the byteswapped result of the program.

Here's my issue: Problem with genesis block replacement (https://bitcointalk.org/index.php?topic=5329334.msg56739840#msg56739840). Try generating the genesis block with this implementation and do what I did.

I hope this solves your problem.