1

I have been struggling with this issue for a week. I have created an altcoin forking litecoin code, i have mined genesis block, the compiled code works fine with 50*COIN genesis block reward.

When i change GenesisBlockreward in chainparams.cpp, to 1000*COIN, i get debug assertion failed. My coins have limited supply of 10 million.

    genesis = CreateGenesisBlock(1518803474, 2297622, 0x1e0ffff0, 1, 1000 * COIN);

Why is this happening?

Here the code for main network.

class CMainParams : public CChainParams {
public:
    CMainParams() {
        strNetworkID = "main";
        consensus.nSubsidyHalvingInterval = 100000;
        consensus.BIP34Height = 710000;
        consensus.BIP34Hash = uint256S("fa09d204a83a768ed5a7c8d441fa62f2043abf420cff1226c7b4329aeb9d51cf");
        consensus.BIP65Height = 918684; // bab3041e8977e0dc3eeff63fe707b92bde1dd449d8efafb248c27c8264cc311a
        consensus.BIP66Height = 811879; // 7aceee012833fa8952f8835d8b1b3ae233cd6ab08fdb27a771d2bd7bdc491894
        consensus.powLimit = uint256S("00000fffffffffffffffffffffffffffffffffffffffffffffffffffffffffff"); 
        consensus.nPowTargetTimespan = 3.5 * 24 * 60 * 60; // 3.5 days
        consensus.nPowTargetSpacing = 2.5 * 60;
        consensus.fPowAllowMinDifficultyBlocks = false;
        consensus.fPowNoRetargeting = false;
        consensus.nRuleChangeActivationThreshold = 6048; // 75% of 8064
        consensus.nMinerConfirmationWindow = 8064; // nPowTargetTimespan / nPowTargetSpacing * 4
        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 = 1485561600; // January 28, 2017
        consensus.vDeployments[Consensus::DEPLOYMENT_CSV].nTimeout = 1517356801; // January 31st, 2018

        // Deployment of SegWit (BIP141, BIP143, and BIP147)
        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].bit = 1;
        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nStartTime = 1485561600; // January 28, 2017
        consensus.vDeployments[Consensus::DEPLOYMENT_SEGWIT].nTimeout = 1517356801; // January 31st, 2018

        // The best chain should have at least this much work.
        consensus.nMinimumChainWork = uint256S("0x00000000000000000000000000000000000000000000002ebcfe2dd9eff82666");

        // By default assume that the signatures in ancestors of this block are valid.
        consensus.defaultAssumeValid = uint256S("0x59c9b9d3fec105bdc716d84caa7579503d5b05b73618d0bf2d5fa639f780a011"); //1353397

        /**
         * 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] = 0xfb;
        pchMessageStart[1] = 0xc0;
        pchMessageStart[2] = 0xb6;
        pchMessageStart[3] = 0xdb;
        nDefaultPort = 26201;
        nPruneAfterHeight = 100000;

        genesis = CreateGenesisBlock(1518803474, 2297622, 0x1e0ffff0, 1, 1000 * COIN);
        consensus.hashGenesisBlock = genesis.GetHash();
        assert(consensus.hashGenesisBlock == uint256S("0x326bcc5731fba75254090bcd460d2e514c0ba86f91f7ef30ba48ff8a32e99c5e"));
        assert(genesis.hashMerkleRoot == uint256S("0xd242c6e48edac265167f85ae2e6de488287fe89c0152343e1cb27216ce282d27"));

        // Note that of those with the service bits flag, most only support a subset of possible options
        //vSeeds.emplace_back("seed-a.litecoin.loshan.co.uk", true);
        //vSeeds.emplace_back("dnsseed.thrasher.io", true);
        //vSeeds.emplace_back("dnsseed.litecointools.com", true);
        //vSeeds.emplace_back("dnsseed.litecoinpool.org", true);
        //vSeeds.emplace_back("dnsseed.koin-project.com", false);

        base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,11);
        base58Prefixes[SCRIPT_ADDRESS] = std::vector<unsigned char>(1,5);
        base58Prefixes[SCRIPT_ADDRESS2] = std::vector<unsigned char>(1,50);
        base58Prefixes[SECRET_KEY] =     std::vector<unsigned char>(1,176);
        base58Prefixes[EXT_PUBLIC_KEY] = {0x04, 0x88, 0xB2, 0x1E};
        base58Prefixes[EXT_SECRET_KEY] = {0x04, 0x88, 0xAD, 0xE4};
Improve this question

1 Answer 1

Reset to default
4

Looks like amount is a part of block information influencing hashes. Try to debug or log resulting hashes before assert:

logging.info("Genesis Block Hash " + consensus.hashGenesisBlock);
logging.info("Compared to Hash " + uint256S("0x326bcc5731fba75254090bcd460d2e514c0ba86f91f7ef30ba48ff8a32e99c5e"));

And then check debug.log in your coin folder.

Improve this answer
5
  • 1
    The genesis block's coinbase transaction would be the where the new 'amount' is influencing the hash.
    – lastcanal
    Commented Feb 18, 2018 at 19:52
  • Thats correct! It generates new hash Genesis hash: Genesis hash:7fc34ec30e346ec63369d23ba2721a80fb1d5309314d23bbcf3cea1ac8aa06a5 Compared to Hash 0x336bcc5731fba75254090bcd460d2e514c0ba86f91f7ef30ba48ff8a32e99c5e Abort trap: 6
    – pbu
    Commented Feb 18, 2018 at 20:24
  • 1
    It worked finally, after i used -v flag in GenesisH0 with new reward value
    – pbu
    Commented Feb 20, 2018 at 16:11
  • @pbu by generating genesis hash with value coins are you able to get genesis coins or have you changed the reward system too ? Like by adding condtion if block is 0/1 reward should be different ...
    – user1140237
    Commented Oct 1, 2018 at 10:43
  • yes i was able to get reward for genesis block.
    – pbu
    Commented Oct 7, 2018 at 9:40

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.