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From newest bitcoin/litecoin source,

So I testing make new genesis block, based on new blockchain.

So I changed at 'chainparams.cpp'
pchMessageStart[0~4] value to random value for start new blockchain, (is this right?)

and also I changed following line's

consensus.hashGenesisBlock == uint256S("0x............");
genesis.hashMerkleRoot == uint256S("0x.....");

to value of mine. (knowing by printf code added above these lines)

After compile ('make'), run by ./bitcoind

but error says 'A fatal internal error occured, see debug.log file'

and debug.log says at end,

ReadBlockFromDisk : Errorrs in block header at CBlockDiskPos(nFile =0, nPos = 8)


Maybe I need to revise more elsewhere to start new blockchain?
How to fix?

Thanks.

Your genesis block is invalid; it probably does not have a valid proof of work. You will actually need to mine your genesis block which you can easily do by adding a while loop to the genesis block creation code (and a few other lines to check the PoW).

Can you please let me know the code to do it?

I can't find. Days of searching already done.

Need more work to creat new coin and run it! You can seaching more info in this forum or via google!

I don't know. I can't find. Already did everything what I can.