I want to make a coin that I can play around with on my own vps's and pc, not to distribute to anybody but myself.
Now that that's out of the way. I want to make it SHA256 instead of scrypt. I am interested in the concept of cryptography and I am having trouble finding an SHA-256 Main.cpp that doesnt already have the genesis block mined, so the arguments are not there. For scrypt getting the genisis block down is as follows:
//// debug print
printf("%s\n", block.GetHash().ToString().c_str());
printf("%s\n", hashGenesisBlock.ToString().c_str());
printf("%s\n", block.hashMerkleRoot.ToString().c_str());
assert(block.hashMerkleRoot == uint256("0x"));
// If genesis block hash does not match, then generate new genesis hash.
if (true && block.GetHash() != hashGenesisBlock)
{
printf("Searching for genesis block...\n");
// This will figure out a valid hash and Nonce if you're
// creating a different genesis block:
uint256 hashTarget = CBigNum().SetCompact(block.nBits).getuint256();
uint256 thash;
char scratchpad[SCRYPT_SCRATCHPAD_SIZE];
loop
{
scrypt_1024_1_1_256_sp(BEGIN(block.nVersion), BEGIN(thash), scratchpad);
if (thash <= hashTarget)
break;
if ((block.nNonce & 0xFFF) == 0)
{
printf("nonce %08X: hash = %s (target = %s)\n", block.nNonce, thash.ToString().c_str(), hashTarget.ToString().c_str());
}
++block.nNonce;
if (block.nNonce == 0)
{
printf("NONCE WRAPPED, incrementing time\n");
++block.nTime;
}
}
printf("block.nTime = %u \n", block.nTime);
printf("block.nNonce = %u \n", block.nNonce);
printf("block.GetHash = %s\n", block.GetHash().ToString().c_str());
}
block.print();
assert(block.GetHash() == hashGenesisBlock);
// Start new block file
unsigned int nFile;
unsigned int nBlockPos;
if (!block.WriteToDisk(nFile, nBlockPos))
return error("LoadBlockIndex() : writing genesis block to disk failed");
if (!block.AddToBlockIndex(nFile, nBlockPos))
return error("LoadBlockIndex() : genesis block not accepted");
}
return true;
}
void PrintBlockTree()
{
But every SHA256 coin I see already has it's Genesis block mined and has only this type of code, and varies from currency to currency:
//// debug print
printf("%s\n", block.GetHash().ToString().c_str());
printf("%s\n", hashGenesisBlock.ToString().c_str());
printf("%s\n", block.hashMerkleRoot.ToString().c_str());
assert(block.hashMerkleRoot == uint256("0x3c2d8f85fab4d17aac558cc648a1a58acff0de6deb890c29985690052c5993c2"));
block.print();
assert(block.GetHash() == hashGenesisBlock);
assert(block.CheckBlock());
// Start new block file
unsigned int nFile;
unsigned int nBlockPos;
if (!block.WriteToDisk(nFile, nBlockPos))
return error("LoadBlockIndex() : writing genesis block to disk failed");
if (!block.AddToBlockIndex(nFile, nBlockPos))
return error("LoadBlockIndex() : genesis block not accepted");
// ppcoin: initialize synchronized checkpoint
if (!Checkpoints::WriteSyncCheckpoint(hashGenesisBlock))
return error("LoadBlockIndex() : failed to init sync checkpoint");
}
// ppcoin: if checkpoint master key changed must reset sync-checkpoint
{
CTxDB txdb;
string strPubKey = "";
if (!txdb.ReadCheckpointPubKey(strPubKey) || strPubKey != CSyncCheckpoint::strMasterPubKey)
{
// write checkpoint master key to db
txdb.TxnBegin();
if (!txdb.WriteCheckpointPubKey(CSyncCheckpoint::strMasterPubKey))
return error("LoadBlockIndex() : failed to write new checkpoint master key to db");
if (!txdb.TxnCommit())
return error("LoadBlockIndex() : failed to commit new checkpoint master key to db");
if ((!fTestNet) && !Checkpoints::ResetSyncCheckpoint())
return error("LoadBlockIndex() : failed to reset sync-checkpoint");
}
txdb.Close();
}
return true;
}
void PrintBlockTree()
I repeat, that this is PURELY for my own purposes in tests and my own knowledge and understanding of how cryptocurrency works. I will not be releasing anything from this.
If you don't have anything useful to add to this thread, please save your time. But if you want to contribute, please do..
Mcoin--
