private void CalculateBalances(int confirmations)
{
var balances = new Dictionary <string, decimal>();
foreach (var genesisTransactions in blocks[0].Transactions)
{
balances.Add(genesisTransactions.To, genesisTransactions.Value);
}
foreach (var block in blocks.Skip(1).Take(blocks.Count - confirmations))
{
if (block.Index == 0)
{
continue;
}
foreach (var transaction in block.Transactions)
{
var senderPublicKey = CryptographyUtilities.DecodeECPointFromHex(transaction.SenderPublicKey);
var bytes = Encoding.UTF8.GetBytes(transaction.TransactionHash);
if (CryptographyUtilities.VerifySigniture(bytes, transaction.SenderSignature, senderPublicKey))
{
balances[transaction.From] -= transaction.Value;
if (balances.ContainsKey(transaction.To))
{
balances[transaction.To] += transaction.Value;
}
else
{
balances.Add(transaction.To, transaction.Value);
}
}
else
{
Console.WriteLine("Found incorrect signiture...");
return;
}
}
}
this.balances = balances;
}
private bool ValidateTransaction(Transaction transaction, IDictionary <string, decimal> futureBalances = null)
{
IDictionary <string, decimal> balances;
bool inSimulationMode = false;
if (futureBalances != null)
{
inSimulationMode = true;
balances = futureBalances;
}
else
{
balances = GetBalances(0);
}
var bytes = Encoding.UTF8.GetBytes(transaction.TransactionHash);
ECPoint senderPublicKey = CryptographyUtilities.DecodeECPointFromHex(transaction.SenderPublicKey);
if (!CryptographyUtilities.VerifySigniture(bytes, transaction.SenderSignature, senderPublicKey))
{
Console.WriteLine("^^^^^^^^^^^^^^^^^^^^^^^^^");
Console.WriteLine("Transaction validation failed...");
Console.WriteLine("INFO -> incorrect signiture...");
return(false);
}
if (!balances.ContainsKey(transaction.From) || balances[transaction.From] < transaction.Value)
{
Console.WriteLine("^^^^^^^^^^^^^^^^^^^^^^^^^");
Console.WriteLine("Transaction validation failed...");
Console.WriteLine("INFO -> not enought money of sender...");
return(false);
}
if (inSimulationMode)
{
balances[transaction.From] -= transaction.Value;
}
var copyOftransaction = new Transaction()
{
From = transaction.From,
To = transaction.To,
Value = transaction.Value,
SenderPublicKey = transaction.SenderPublicKey
};
var transactionJson = JsonConvert.SerializeObject(copyOftransaction);
var transactionHash = CryptographyUtilities.BytesToHex(CryptographyUtilities.CalcSHA256(transactionJson));
if (transactionHash != transaction.TransactionHash)
{
Console.WriteLine("^^^^^^^^^^^^^^^^^^^^^^^^^");
Console.WriteLine("Transaction validation failed...");
Console.WriteLine("INFO -> incorrect transaction hash...");
return(false);
}
Console.WriteLine("Transaction validation success...");
return(true);
}