The aim of this post is to explain how to create your own blockchain based in HTML
Fork the html github project at HTML
Modifies Readme according to your coin
Change all files in the repo according to your coin:
example:
Replace
htmlcoin --> yourcoinname
HTMLCOIN --> Yourcoinname
HTM--> YOURCOINNAME
In src/qt/guiutil.cpp
replace uri.replace(0, 11, "htmlcoin:"); // HTMLCOIN: change string length to 11 to correctly parse htmlcoin://
for uri.replace(0, 12, "yourcoinname:"); // YOURCOINNAME: change string length to 12 to correctly parse yourcoinname://
Now we have to change all configurations and create the genesis block
Create genesis block
In our new coin, we have to create a new genesis block to start the chain, this is done changing the chainparams.cpp
First, we have to change with the current timestamp, go to Timestamp
`genesis = CreateGenesisBlock(mytimestamp, 23815, 0x1f00ffff, 1, 1 * COIN);``
example:
genesis = CreateGenesisBlock(1521515740, 23815, 0x1f00ffff, 1, 1 * COIN);
This timestamp to a recent news, as example
const char* pszTimestamp = "NYT 3/28/2018 States Take On Trump Over a Census Change Seen as Political";
Finally
startNewChain = true;
comment these with \\ like
//assert(consensus.hashGenesisBlock == uint256S("0x0000bf23c6424c270a24a17a3db723361c349e0f966d7b55a6bca4bfb2d951b0")); //assert(genesis.hashMerkleRoot == uint256S("0xb07b60977e6f1ebfc23c074fb319c654e38dba5d7db16902863a4a98dd981f68"));
run the first time with ./yourcoind,
then stop, go to .yourcoindiretory
gedit debug.log
use the genesis hash, merkle root and nounce logs from debug.log
now use the genesis hash, merkleroot and nnounce value founded and put in
assert(consensus.hashGenesisBlock == uint256S("0xyourgenesishash")
assert(consensus.hashMerkleRoot == uint256S("0xyourmerkleroot")
`genesis = CreateGenesisBlock(mytimestamp, yournounce, 0x1f00ffff, 1, 1 * COIN);``
change
// The best chain should have at least this much work. consensus.nMinimumChainWork = uint256S("0x0000000000000000000000000000000000000000000000000000000000010000"); //
this value has to be updated later when chain is working
Now you have a blockchain running
Modify
`chainTxData = ChainTxData{
// Data as of block 00000000000000000166d612d5595e2b1cd88d71d695fc580af64d8da8658c23 (height 446482).
0, // * UNIX timestamp of last known number of transactions
0, // * total number of transactions between genesis and that timestamp
// (the tx=... number in the SetBestChain debug.log lines)
0 // * estimated number of transactions per second after that timestamp
};``
because we not have blocks yet
put
checkpointData = (CCheckpointData) { boost::assign::map_list_of ( 0, uint256S("0xyourgenesishash")) };
example
checkpointData = (CCheckpointData) { boost::assign::map_list_of ( 0, uint256S("0x0000875a5fd721640c8cdb7769a74099c1fa943e62777abf3a79a2ea21bb819f")) };
with only the genesis block hash
Change random all the characters
``
pchMessageStart[0] = 0x1f;
pchMessageStart[1] = 0x2e;
pchMessageStart[2] = 0x3d;
pchMessageStart[3] = 0x4c;
`
Change
nDefaultPort = 4888;
to a port not used by a chain, for example
nDefaultPort = 4900;
delete or change with your seeds
vSeeds.push_back(CDNSSeedData("htmlcoin.com", "seed1.htmlcoin.com", false)); vSeeds.push_back(CDNSSeedData("htmlcoin.com", "seed2.htmlcoin.com", false)); vSeeds.push_back(CDNSSeedData("htmlcoin.com", "seed3.htmlcoin.com", false)); vSeeds.push_back(CDNSSeedData("htmlcoin.com", "seed4.htmlcoin.com", false));
for example
vSeeds.push_back(CDNSSeedData("yourcoin.com", "seed1.yourcoin.com", false)); vSeeds.push_back(CDNSSeedData("yourcoin.com", "seed2.yourcoin.com", false)); vSeeds.push_back(CDNSSeedData("yourcoin.com", "seed3.yourcoin.com", false)); vSeeds.push_back(CDNSSeedData("yourcoin.com", "seed4.yourcoin.com", false));
Change now
startNewChain = false;
Now in chainparamsbase.cpp
Change
CBaseMainParams() { nRPCPort = 4889; }
to, for example
CBaseMainParams()
{
nRPCPort = 4901;
}
Testing MAIN Chain
Now you can run your with ./yourcoind or ./yourcoin-qt. We need a minimum of two machines to test the chain.
Setup two machines with the changed repo and create an yourcoin.conf and put it in .yourcoin diretory
VPS1
rpcuser=test rpcpassword=test rpcallowip=127.0.0.1 daemon=1 server=1 listen=1 port=4900 rpcport=4901 connect= vps 2 ip machine
VPS2
rpcuser=test rpcpassword=test rpcallowip=127.0.0.1 daemon=1 server=1 listen=1 port=4900 rpcport=4901 connect= vps 1 ip machine
type in one machine
``./yourcoin-cli generate 1 99999`
to start mining
in the other machine type
./yourcoin-cli getinfo
if it appears with blocs=1, your chain is working and syncing
If you find this tutorial useful support me, my html address:
HpzdD5S8RgeBT1DhBBSPXcLXCoRmky2jWt
TODO
Change testNet
Premine
Revert coingather code
References
Create your ethereum blockchain