public void CanCheckBlockWithWitness()
{
var block = new Block(Encoders.Hex.DecodeData("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"));
var consensusFlags = new ConsensusFlags()
{
ScriptFlags = ScriptVerify.Witness | ScriptVerify.P2SH | ScriptVerify.Standard,
LockTimeFlags = LockTimeFlags.MedianTimePast,
EnforceBIP34 = true
};
var context = new ContextInformation()
{
BestBlock = new ContextBlockInformation()
{
MedianTimePast = DateTimeOffset.Parse("2016-03-31T09:02:19+00:00", CultureInfo.InvariantCulture),
Height = 10111
},
NextWorkRequired = block.Header.Bits,
Time = DateTimeOffset.UtcNow,
BlockResult = new BlockResult {
Block = block
},
Flags = consensusFlags,
};
Network.Main.Consensus.Options = new PowConsensusOptions();
var validator = new PowConsensusValidator(Network.Main);
//validator.CheckBlockHeader(context);
validator.ContextualCheckBlock(context);
validator.CheckBlock(context);
}
private Task TryPrefetchAsync(ConsensusFlags flags)
{
Task prefetching = Task.FromResult <bool>(true);
if (this.UTXOSet is CachedCoinView)
{
var nextBlock = this.Puller.TryGetLookahead(0);
if (nextBlock != null)
{
prefetching = this.UTXOSet.FetchCoinsAsync(GetIdsToFetch(nextBlock, flags.EnforceBIP30));
}
}
return(prefetching);
}
public long GetTransactionSigOpCost(Transaction tx, UnspentOutputSet inputs, ConsensusFlags flags)
{
long nSigOps = this.GetLegacySigOpCount(tx) * this.consensusOptions.WITNESS_SCALE_FACTOR;
if (tx.IsCoinBase)
{
return(nSigOps);
}
if (flags.ScriptFlags.HasFlag(ScriptVerify.P2SH))
{
nSigOps += this.GetP2SHSigOpCount(tx, inputs) * this.consensusOptions.WITNESS_SCALE_FACTOR;
}
for (var i = 0; i < tx.Inputs.Count; i++)
{
var prevout = inputs.GetOutputFor(tx.Inputs[i]);
nSigOps += this.CountWitnessSigOps(tx.Inputs[i].ScriptSig, prevout.ScriptPubKey, tx.Inputs[i].WitScript, flags);
}
return(nSigOps);
}
private long WitnessSigOps(WitProgramParameters witParams, WitScript witScript, ConsensusFlags flags)
{
if (witParams.Version == 0)
{
if (witParams.Program.Length == 20)
{
return(1);
}
if (witParams.Program.Length == 32 && witScript.PushCount > 0)
{
Script subscript = Script.FromBytesUnsafe(witScript.GetUnsafePush(witScript.PushCount - 1));
return(subscript.GetSigOpCount(true));
}
}
// Future flags may be implemented here.
return(0);
}
private long CountWitnessSigOps(Script scriptSig, Script scriptPubKey, WitScript witness, ConsensusFlags flags)
{
witness = witness ?? WitScript.Empty;
if (!flags.ScriptFlags.HasFlag(ScriptVerify.Witness))
{
return(0);
}
var witParams = PayToWitTemplate.Instance.ExtractScriptPubKeyParameters2(scriptPubKey);
if (witParams != null)
{
return(this.WitnessSigOps(witParams, witness, flags));
}
if (scriptPubKey.IsPayToScriptHash && scriptSig.IsPushOnly)
{
var data = scriptSig.ToOps().Select(o => o.PushData).LastOrDefault() ?? new byte[0];
var subScript = Script.FromBytesUnsafe(data);
witParams = PayToWitTemplate.Instance.ExtractScriptPubKeyParameters2(scriptPubKey);
if (witParams != null)
{
return(this.WitnessSigOps(witParams, witness, flags));
}
}
return(0);
}
public virtual void ExecuteBlock(ContextInformation context, TaskScheduler taskScheduler)
{
Block block = context.BlockResult.Block;
ChainedBlock index = context.BlockResult.ChainedBlock;
ConsensusFlags flags = context.Flags;
UnspentOutputSet view = context.Set;
this.PerformanceCounter.AddProcessedBlocks(1);
taskScheduler = taskScheduler ?? TaskScheduler.Default;
if (flags.EnforceBIP30)
{
foreach (var tx in block.Transactions)
{
var coins = view.AccessCoins(tx.GetHash());
if (coins != null && !coins.IsPrunable)
{
ConsensusErrors.BadTransactionBIP30.Throw();
}
}
}
long nSigOpsCost = 0;
Money nFees = Money.Zero;
List <Task <bool> > checkInputs = new List <Task <bool> >();
for (int i = 0; i < block.Transactions.Count; i++)
{
this.PerformanceCounter.AddProcessedTransactions(1);
var tx = block.Transactions[i];
if (!tx.IsCoinBase && (!context.IsPoS || (context.IsPoS && !tx.IsCoinStake)))
{
int[] prevheights;
if (!view.HaveInputs(tx))
{
ConsensusErrors.BadTransactionMissingInput.Throw();
}
prevheights = new int[tx.Inputs.Count];
// Check that transaction is BIP68 final
// BIP68 lock checks (as opposed to nLockTime checks) must
// be in ConnectBlock because they require the UTXO set
for (var j = 0; j < tx.Inputs.Count; j++)
{
prevheights[j] = (int)view.AccessCoins(tx.Inputs[j].PrevOut.Hash).Height;
}
if (!tx.CheckSequenceLocks(prevheights, index, flags.LockTimeFlags))
{
ConsensusErrors.BadTransactionNonFinal.Throw();
}
}
// GetTransactionSigOpCost counts 3 types of sigops:
// * legacy (always)
// * p2sh (when P2SH enabled in flags and excludes coinbase)
// * witness (when witness enabled in flags and excludes coinbase)
nSigOpsCost += this.GetTransactionSigOpCost(tx, view, flags);
if (nSigOpsCost > this.consensusOptions.MAX_BLOCK_SIGOPS_COST)
{
ConsensusErrors.BadBlockSigOps.Throw();
}
if (!tx.IsCoinBase && (!context.IsPoS || (context.IsPoS && !tx.IsCoinStake)))
{
this.CheckInputs(tx, view, index.Height);
nFees += view.GetValueIn(tx) - tx.TotalOut;
int ii = i;
var localTx = tx;
PrecomputedTransactionData txData = new PrecomputedTransactionData(tx);
for (int iInput = 0; iInput < tx.Inputs.Count; iInput++)
{
this.PerformanceCounter.AddProcessedInputs(1);
var input = tx.Inputs[iInput];
int iiIntput = iInput;
var txout = view.GetOutputFor(input);
var checkInput = new Task <bool>(() =>
{
if (this.UseConsensusLib)
{
Script.BitcoinConsensusError error;
return(Script.VerifyScriptConsensus(txout.ScriptPubKey, tx, (uint)iiIntput, flags.ScriptFlags, out error));
}
else
{
var checker = new TransactionChecker(tx, iiIntput, txout.Value, txData);
var ctx = new ScriptEvaluationContext();
ctx.ScriptVerify = flags.ScriptFlags;
return(ctx.VerifyScript(input.ScriptSig, txout.ScriptPubKey, checker));
}
});
checkInput.Start(taskScheduler);
checkInputs.Add(checkInput);
}
}
this.UpdateCoinView(context, tx);
}
this.CheckBlockReward(context, nFees, index, block);
var passed = checkInputs.All(c => c.GetAwaiter().GetResult());
if (!passed)
{
ConsensusErrors.BadTransactionScriptError.Throw();
}
}
