public bool IsValidChain(string prevBlockHash, bool verbose)
{
bool isValid = true;
BuildMerkleTree();
string newBlockHash = HashFun.GetSha256(Nonce + CalculateBlockHash(prevBlockHash));
bool validSignature = KeyStore.VerifyBlock(newBlockHash, BlockSignature);
if (newBlockHash != BlockHash)
{
isValid = false;
}
else
{
isValid |= PreviousBlockHash == prevBlockHash;
}
PrintVerificationMessage(verbose, isValid, validSignature);
if (NextBlock != null)
{
return(NextBlock.IsValidChain(newBlockHash, true));
}
return(isValid);
}
public string CalculateBlockHash(string previousBlockHash)
{
string txnHash = ClaimNumber + SettlementAmount + SettlementDate + CarRegistration + Mileage + ClaimType;
string blockHeader = BlockNumber + CreatedDate.ToString() + previousBlockHash;
string combined = txnHash + blockHeader;
return(HashFun.GetSha256(combined));
}
public string CalculateBlockHash(string previousBlockHash)
{
string blockheader = BlockNumber + CreatedDate.ToString() + previousBlockHash;
string combined = merkleTree.RootNode + blockheader;
if (KeyStore == null)
{
return(HashFun.GetSha256(combined));
}
else
{
return(HashFun.GetHMACHash(combined, KeyStore.AuthenticatedHashKey));
}
}
public string CalculateTransactionHash()
{
string txnHash = ClaimNumber + SettlementAmount + SettlementDate + CarRegistration + Mileage + ClaimType;
return(HashFun.GetSha256(txnHash));
}