protected static Coin[] FindUnspentCoins(IEnumerable <Coin> unspents, UInt256 asset_id, Fixed8 amount)
{
Coin[] unspents_asset = unspents.Where(p => p.Output.AssetId == asset_id).ToArray();
unspents_asset = VerifyTransactionContract.checkUtxo(unspents_asset);//By BHP
Fixed8 sum = unspents_asset.Sum(p => p.Output.Value);
if (sum < amount)
{
return(null);
}
if (sum == amount)
{
return(unspents_asset);
}
Coin[] unspents_ordered = unspents_asset.OrderByDescending(p => p.Output.Value).ToArray();
int i = 0;
while (unspents_ordered[i].Output.Value <= amount)
{
amount -= unspents_ordered[i++].Output.Value;
}
if (amount == Fixed8.Zero)
{
return(unspents_ordered.Take(i).ToArray());
}
else
{
return(unspents_ordered.Take(i).Concat(new[] { unspents_ordered.Last(p => p.Output.Value >= amount) }).ToArray());
}
}
/*
* public virtual bool Verify(Snapshot snapshot, IEnumerable<Transaction> mempool)
* {
* if (Size > MaxTransactionSize) return false;
* for (int i = 1; i < Inputs.Length; i++)
* for (int j = 0; j < i; j++)
* if (Inputs[i].PrevHash == Inputs[j].PrevHash && Inputs[i].PrevIndex == Inputs[j].PrevIndex)
* return false;
* if (mempool.Where(p => p != this).SelectMany(p => p.Inputs).Intersect(Inputs).Count() > 0)
* return false;
* if (snapshot.IsDoubleSpend(this))
* return false;
* foreach (var group in Outputs.GroupBy(p => p.AssetId))
* {
* AssetState asset = snapshot.Assets.TryGet(group.Key);
* if (asset == null) return false;
* if (asset.Expiration <= snapshot.Height + 1 && asset.AssetType != AssetType.GoverningToken && asset.AssetType != AssetType.UtilityToken)
* return false;
* foreach (TransactionOutput output in group)
* if (output.Value.GetData() % (long)Math.Pow(10, 8 - asset.Precision) != 0)
* return false;
* }
* TransactionResult[] results = GetTransactionResults()?.ToArray();
* if (results == null) return false;
* TransactionResult[] results_destroy = results.Where(p => p.Amount > Fixed8.Zero).ToArray();
* if (results_destroy.Length > 1) return false;
* if (results_destroy.Length == 1 && results_destroy[0].AssetId != Blockchain.UtilityToken.Hash)
* return false;
* if (SystemFee > Fixed8.Zero && (results_destroy.Length == 0 || results_destroy[0].Amount < SystemFee))
* return false;
* TransactionResult[] results_issue = results.Where(p => p.Amount < Fixed8.Zero).ToArray();
* switch (Type)
* {
* case TransactionType.MinerTransaction:
* case TransactionType.ClaimTransaction:
* if (results_issue.Any(p => p.AssetId != Blockchain.UtilityToken.Hash))
* return false;
* break;
* case TransactionType.IssueTransaction:
* if (results_issue.Any(p => p.AssetId == Blockchain.UtilityToken.Hash))
* return false;
* break;
* default:
* if (results_issue.Length > 0)
* return false;
* break;
* }
* if (Attributes.Count(p => p.Usage == TransactionAttributeUsage.ECDH02 || p.Usage == TransactionAttributeUsage.ECDH03) > 1)
* return false;
* if (!VerifyReceivingScripts()) return false;
* return this.VerifyWitnesses(snapshot);
* }
*/
public virtual bool Verify(Snapshot snapshot, IEnumerable <Transaction> mempool)
{
if (Size > MaxTransactionSize)
{
return(false);
}
for (int i = 1; i < Inputs.Length; i++)
{
for (int j = 0; j < i; j++)
{
if (Inputs[i].PrevHash == Inputs[j].PrevHash && Inputs[i].PrevIndex == Inputs[j].PrevIndex)
{
return(false);
}
}
}
if (mempool.Where(p => p != this).SelectMany(p => p.Inputs).Intersect(Inputs).Count() > 0)
{
return(false);
}
if (snapshot.IsDoubleSpend(this))
{
return(false);
}
foreach (var group in Outputs.GroupBy(p => p.AssetId))
{
AssetState asset = snapshot.Assets.TryGet(group.Key);
if (asset == null)
{
return(false);
}
if (asset.Expiration <= snapshot.Height + 1 && asset.AssetType != AssetType.GoverningToken && asset.AssetType != AssetType.UtilityToken)
{
return(false);
}
foreach (TransactionOutput output in group)
{
if (output.Value.GetData() % (long)Math.Pow(10, 8 - asset.Precision) != 0)
{
return(false);
}
}
}
TransactionResult[] results = GetTransactionResults()?.ToArray();
if (results == null)
{
return(false);
}
TransactionResult[] results_destroy = results.Where(p => p.Amount > Fixed8.Zero).ToArray();
if (ServiceFee.Verify(this, results_destroy, SystemFee) == false)
{
return(false); //By BHP
}
if (SystemFee > Fixed8.Zero && (results_destroy.Length == 0 || results_destroy[0].Amount < SystemFee))
{
return(false);
}
TransactionResult[] results_issue = results.Where(p => p.Amount < Fixed8.Zero).ToArray();
switch (Type)
{
//By BHP
case TransactionType.MinerTransaction:
if (VerifyMiningTransaction.Verify(Outputs, Attributes) == false)
{
return(false);
}
break;
case TransactionType.ClaimTransaction:
if (results_issue.Any(p => p.AssetId != Blockchain.UtilityToken.Hash))
{
return(false);
}
break;
case TransactionType.IssueTransaction:
if (results_issue.Any(p => p.AssetId == Blockchain.UtilityToken.Hash))
{
return(false);
}
break;
default:
if (results_issue.Length > 0)
{
return(false);
}
break;
}
if (Attributes.Count(p => p.Usage == TransactionAttributeUsage.ECDH02 || p.Usage == TransactionAttributeUsage.ECDH03) > 1)
{
return(false);
}
if (!VerifyReceivingScripts())
{
return(false);
}
if (VerifyTransactionContract.Verify(snapshot, this) == false)
{
return(false); //By BHP
}
return(this.VerifyWitnesses(snapshot));
}
