public TrustedBroadcastRequest FulfillOffer(
TransactionSignature clientSignature,
Script cashout,
FeeRate feeRate)
{
if (clientSignature == null)
{
throw new ArgumentNullException(nameof(clientSignature));
}
if (feeRate == null)
{
throw new ArgumentNullException(nameof(feeRate));
}
AssertState(SolverServerStates.WaitingFulfillment);
Script offerScript = GetOfferScript();
var offer = GetUnsignedOfferTransaction();
PubKey clientKey = AssertValidSignature(clientSignature, offer);
TransactionBuilder builder = new TransactionBuilder();
builder.StandardTransactionPolicy.CheckFee = false;
builder.Extensions.Add(new EscrowBuilderExtension());
builder.AddCoins(InternalState.EscrowedCoin);
builder.AddKeys(InternalState.EscrowKey);
builder.AddKnownSignature(clientKey, clientSignature);
builder.SignTransactionInPlace(offer);
if (!builder.Verify(offer))
{
throw new PuzzleException("invalid-tumbler-signature");
}
var offerCoin = offer.Outputs.AsCoins().First().ToScriptCoin(offerScript);
var solutions = InternalState.SolvedPuzzles.Select(s => s.SolutionKey).ToArray();
Transaction fulfill = new Transaction();
fulfill.Inputs.Add(new TxIn(offerCoin.Outpoint));
fulfill.Outputs.Add(new TxOut(offerCoin.Amount, cashout));
var fulfillScript = SolverScriptBuilder.CreateFulfillScript(NBitcoin.BuilderExtensions.BuilderExtension.DummySignature, solutions);
fulfill.Inputs[0].ScriptSig = fulfillScript + Op.GetPushOp(offerCoin.Redeem.ToBytes());
fulfill.Outputs[0].Value -= feeRate.GetFee(fulfill.GetVirtualSize());
var signature = fulfill.Inputs.AsIndexedInputs().First().Sign(InternalState.FulfillKey, offerCoin, SigHash.All);
fulfillScript = SolverScriptBuilder.CreateFulfillScript(signature, solutions);
fulfill.Inputs[0].ScriptSig = fulfillScript + Op.GetPushOp(offerCoin.Redeem.ToBytes());
InternalState.OfferClientSignature = clientSignature;
InternalState.Status = SolverServerStates.WaitingEscape;
return(new TrustedBroadcastRequest
{
Key = InternalState.FulfillKey,
PreviousScriptPubKey = offerCoin.ScriptPubKey,
Transaction = fulfill
});
}
public TrustedBroadcastRequest FulfillOffer(
TransactionSignature clientSignature,
Script cashout,
FeeRate feeRate)
{
if (clientSignature == null)
{
throw new ArgumentNullException(nameof(clientSignature));
}
if (feeRate == null)
{
throw new ArgumentNullException(nameof(feeRate));
}
AssertState(SolverServerStates.WaitingFulfillment);
var offer = GetUnsignedOfferTransaction();
PubKey clientKey = AssertValidSignature(clientSignature, offer);
offer.Inputs[0].ScriptSig = new Script(
Op.GetPushOp(clientSignature.ToBytes()),
Op.GetPushOp(CreateOfferSignature().ToBytes()),
Op.GetPushOp(InternalState.EscrowedCoin.Redeem.ToBytes())
);
offer.Inputs[0].Witnessify();
if (!offer.Inputs.AsIndexedInputs().First().VerifyScript(_Network, InternalState.EscrowedCoin))
{
throw new PuzzleException("invalid-tumbler-signature");
}
var solutions = InternalState.SolvedPuzzles.Select(s => s.SolutionKey).ToArray();
Transaction fulfill = new Transaction();
fulfill.Inputs.Add(new TxIn());
fulfill.Outputs.Add(new TxOut(InternalState.OfferCoin.Amount, cashout));
var fulfillScript = SolverScriptBuilder.CreateFulfillScript(null, solutions);
fulfill.Inputs[0].ScriptSig = fulfillScript + Op.GetPushOp(InternalState.OfferCoin.Redeem.ToBytes());
fulfill.Inputs[0].Witnessify();
var virtualSize = fulfill.HasWitness ? fulfill.GetVirtualSize(_Network.Consensus.Options.WitnessScaleFactor) : fulfill.GetSerializedSize();
fulfill.Outputs[0].Value -= feeRate.GetFee(virtualSize);
InternalState.OfferClientSignature = clientSignature;
InternalState.Status = SolverServerStates.WaitingEscape;
return(new TrustedBroadcastRequest
{
Key = InternalState.FulfillKey,
PreviousScriptPubKey = InternalState.OfferCoin.ScriptPubKey,
Transaction = fulfill
});
}