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Title: start bitcoin core private blockchain Post by: victorkimba17 on May 24, 2018, 05:36:06 AM To start a customised private bitcoin core blockchain, all i need to do is:
1) change the genesis block 2) change the timestamp of genesis block is there anything else? Title: Re: start bitcoin core private blockchain Post by: QRC on May 24, 2018, 05:52:53 AM To start a customised private bitcoin core blockchain, all i need to do is: 1) change the genesis block 2) change the timestamp of genesis block is there anything else? what do you mean by private bitcoin core chain? 1) bitcoin core it's just a client, so use bitcoin blockchain term. 2) do you want to fork bitcoin codebase? In this case you have to change more parameters than genesis block: port number, magic message number ect. 3) But if you just want to run private bitcoin blockchain for your own testing or something similar, you don't have to change anything :) just start daemon with -regtest option. Title: Re: start bitcoin core private blockchain Post by: victorkimba17 on May 24, 2018, 06:07:14 AM what do you mean by private bitcoin core chain? 1) bitcoin core it's just a client, so use bitcoin blockchain term. 2) do you want to fork bitcoin codebase? In this case you have to change more parameters than genesis block: port number, magic message number ect. 3) But if you just want to run private bitcoin blockchain for your own testing or something similar, you don't have to change anything :) just start daemon with -regtest option. Thank you. I would like to fork bitcoin code base. In src/chainparams.cpp Quote const char* pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks"; const CScript genesisOutputScript = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef3 8c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG; Can i just change the timestamp and genesis output script, to create a customised bitcoin ? Title: Re: start bitcoin core private blockchain Post by: QRC on May 24, 2018, 06:34:21 AM what do you mean by private bitcoin core chain? 1) bitcoin core it's just a client, so use bitcoin blockchain term. 2) do you want to fork bitcoin codebase? In this case you have to change more parameters than genesis block: port number, magic message number ect. 3) But if you just want to run private bitcoin blockchain for your own testing or something similar, you don't have to change anything :) just start daemon with -regtest option. Thank you. I would like to fork bitcoin code base. In src/chainparams.cpp Quote const char* pszTimestamp = "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks"; const CScript genesisOutputScript = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef3 8c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG; Can i just change the timestamp and genesis output script, to create a customised bitcoin ? Read some guide, for example this one: Complete Guide on How to Create a New Alt Coin (https://bitcointalk.org/index.php?topic=225690.0) Title: Re: start bitcoin core private blockchain Post by: victorkimba17 on May 24, 2018, 07:28:42 AM i found a good link
https://bitcoin.stackexchange.com/questions/13122/scriptsig-coinbase-structure-of-the-genesis-block i tried to print out the value in chainparams.cpp before assert in line 125. But value is printed out as 0x0, and 0x103? Quote fprintf(stdout,"0x%x\n",consensus.hashGenesisBlock); fprintf(stdout,"0x%x\n",genesis.hashMerkleRoot); the warning is : format specifies type 'unsigned int' but the argument has type 'uint256' Update: use this to print uint256. They are string. Quote fprintf(stdout,"%s\n", consensus.hashGenesisBlock.ToString().c_str()); fprintf(stdout,"%s\n",genesis.hashMerkleRoot.ToString().c_str()); Title: Re: start bitcoin core private blockchain Post by: victorkimba17 on May 24, 2018, 07:40:27 AM Quote No it's not enough. Read some guide, for example this one: Complete Guide on How to Create a New Alt Coin (https://bitcointalk.org/index.php?topic=225690.0) I read it. Title: Re: start bitcoin core private blockchain Post by: victorkimba17 on May 24, 2018, 07:53:29 AM i only changed the timestamp, when starting bitcoind, i got the error in debug.log
2018-05-24 07:50:44 mapAddressBook.size() = 1 2018-05-24 07:50:44 ERROR: ReadBlockFromDisk: Errors in block header at CBlockDiskPos(nFile=0, nPos=8) 2018-05-24 07:50:44 *** Failed to read block 2018-05-24 07:50:44 Error: Error: A fatal internal error occurred, see debug.log for details It is solved by running bitcoind with -reindex Title: Re: start bitcoin core private blockchain Post by: victorkimba17 on May 24, 2018, 08:58:46 AM when i run the bitcoin-cli, i got the error
error code: -28 error message: Loading wallet... In the protocol.h, the error meaning is: RPC_IN_WARMUP = -28, //!< Client still warming up |