public bool Verify(Block block)
{
var task = _blockRepository.GetBlockHeader(block.PreviousBlockHash);
task.Wait();
var prevHeader = task.Result;
if (prevHeader == null)
{
return(false);
}
if (prevHeader.Index + 1 != block.Index)
{
return(false);
}
if (prevHeader.Timestamp >= block.Timestamp)
{
return(false);
}
if (!_witnessOperationsManager.Verify(block.Witness))
{
return(false);
}
return(true);
}
public bool Verify(Transaction transaction)
{
if (transaction.Attributes.Any(p =>
p.Usage == TransactionAttributeUsage.ECDH02 || p.Usage == TransactionAttributeUsage.ECDH03))
{
return(false);
}
for (var i = 1; i < transaction.Inputs.Length; i++)
{
for (var j = 0; j < i; j++)
{
if (transaction.Inputs[i].PrevHash == transaction.Inputs[j].PrevHash &&
transaction.Inputs[i].PrevIndex == transaction.Inputs[j].PrevIndex)
{
return(false);
}
}
}
if (this._transactionModel.IsDoubleSpend(transaction))
{
return(false);
}
foreach (var group in transaction.Outputs.GroupBy(p => p.AssetId))
{
var asset = this._assetModel.GetAsset(group.Key).Result;
if (asset == null)
{
return(false);
}
// TODO: Should we check for `asset.Expiration <= _blockchain.Height + 1` ??
if (asset.AssetType != AssetType.GoverningToken &&
asset.AssetType != AssetType.UtilityToken)
{
return(false);
}
var tenPoweredToEightMinusAssetPrecision = (long)Math.Pow(10, 8 - asset.Precision);
if (group.Any(output => output.Value.Value % tenPoweredToEightMinusAssetPrecision != 0))
{
return(false);
}
}
var results = this.GetTransactionResults(transaction)?.ToArray();
if (results == null)
{
return(false);
}
var resultsDestroy = results.Where(p => p.Amount > Fixed8.Zero).ToArray();
if (resultsDestroy.Length > 1)
{
return(false);
}
if (resultsDestroy.Length == 1 &&
resultsDestroy[0].AssetId != this._transactionContext.UtilityTokenHash)
{
return(false);
}
if (this._transactionContext.GetSystemFee(transaction) > Fixed8.Zero &&
(resultsDestroy.Length == 0 ||
resultsDestroy[0].Amount < this._transactionContext.GetSystemFee(transaction)))
{
return(false);
}
var resultsIssue = results.Where(p => p.Amount < Fixed8.Zero).ToArray();
if (resultsIssue.Any(p => p.AssetId != this._transactionContext.UtilityTokenHash) &&
(transaction.Type == TransactionType.ClaimTransaction ||
transaction.Type == TransactionType.IssueTransaction))
{
return(false);
}
if (transaction.Type != TransactionType.MinerTransaction &&
resultsIssue.Length > 0)
{
return(false);
}
// TODO: Verify Receiving Scripts?
if (transaction.Witness.Any(witness => !_witnessOperationsManager.Verify(witness)))
{
return(false);
}
return(true);
}