public CcjRound(RPCClient rpc, UtxoReferee utxoReferee, CcjRoundConfig config)
{
try
{
Interlocked.Increment(ref RoundCount);
RoundId = Interlocked.Read(ref RoundCount);
RpcClient = Guard.NotNull(nameof(rpc), rpc);
UtxoReferee = Guard.NotNull(nameof(utxoReferee), utxoReferee);
Guard.NotNull(nameof(config), config);
ConfirmationTarget = (int)config.ConfirmationTarget;
CoordinatorFeePercent = (decimal)config.CoordinatorFeePercent;
AnonymitySet = (int)config.AnonymitySet;
InputRegistrationTimeout = TimeSpan.FromSeconds((long)config.InputRegistrationTimeout);
ConnectionConfirmationTimeout = TimeSpan.FromSeconds((long)config.ConnectionConfirmationTimeout);
OutputRegistrationTimeout = TimeSpan.FromSeconds((long)config.OutputRegistrationTimeout);
SigningTimeout = TimeSpan.FromSeconds((long)config.SigningTimeout);
PhaseLock = new object();
Phase = CcjRoundPhase.InputRegistration;
StatusLock = new object();
Status = CcjRoundStatus.NotStarted;
RegisteredUnblindedSignatures = new List <UnblindedSignature>();
RegisteredUnblindedSignaturesLock = new object();
MixingLevels = new MixingLevels(config.Denomination, new Signer(new Key()));
for (int i = 0; i < config.MaximumMixingLevelCount - 1; i++)
{
MixingLevels.AddNewLevel();
}
_unsignedCoinJoinHex = null;
UnsignedCoinJoin = null;
SignedCoinJoin = null;
Alices = new List <Alice>();
Bobs = new List <Bob>();
Logger.LogInfo <CcjRound>($"New round ({RoundId}) is created.\n\t" +
$"BaseDenomination: {MixingLevels.GetBaseDenomination().ToString(false, true)} BTC.\n\t" +
$"{nameof(ConfirmationTarget)}: {ConfirmationTarget}.\n\t" +
$"{nameof(CoordinatorFeePercent)}: {CoordinatorFeePercent}%.\n\t" +
$"{nameof(AnonymitySet)}: {AnonymitySet}.");
}
catch (Exception ex)
{
Logger.LogError <CcjRound>($"Round ({RoundId}): Could not create.");
Logger.LogError <CcjRound>(ex);
throw;
}
}
public async Task ExecuteNextPhaseAsync(CcjRoundPhase expectedPhase, Money feePerInputs = null, Money feePerOutputs = null)
{
using (await RoundSynchronizerLock.LockAsync())
{
try
{
Logger.LogInfo <CcjRound>($"Round ({RoundId}): Phase change requested: {expectedPhase.ToString()}.");
if (Status == CcjRoundStatus.NotStarted) // So start the input registration phase
{
if (expectedPhase != CcjRoundPhase.InputRegistration)
{
return;
}
// Calculate fees.
if (feePerInputs is null || feePerOutputs is null)
{
(Money feePerInputs, Money feePerOutputs)fees = await CalculateFeesAsync(RpcClient, ConfirmationTarget);
FeePerInputs = feePerInputs ?? fees.feePerInputs;
FeePerOutputs = feePerOutputs ?? fees.feePerOutputs;
}
else
{
FeePerInputs = feePerInputs;
FeePerOutputs = feePerOutputs;
}
Status = CcjRoundStatus.Running;
}
else if (Status != CcjRoundStatus.Running) // Aborted or succeeded, swallow
{
return;
}
else if (Phase == CcjRoundPhase.InputRegistration)
{
if (expectedPhase != CcjRoundPhase.ConnectionConfirmation)
{
return;
}
Phase = CcjRoundPhase.ConnectionConfirmation;
}
else if (Phase == CcjRoundPhase.ConnectionConfirmation)
{
if (expectedPhase != CcjRoundPhase.OutputRegistration)
{
return;
}
Phase = CcjRoundPhase.OutputRegistration;
}
else if (Phase == CcjRoundPhase.OutputRegistration)
{
if (expectedPhase != CcjRoundPhase.Signing)
{
return;
}
// Build CoinJoin:
Money newDenomination = CalculateNewDenomination();
var transaction = Network.Consensus.ConsensusFactory.CreateTransaction();
// 2. Add Bob outputs.
foreach (Bob bob in Bobs.Where(x => x.Level == MixingLevels.GetBaseLevel()))
{
transaction.Outputs.AddWithOptimize(newDenomination, bob.ActiveOutputAddress.ScriptPubKey);
}
// 2.1 newDenomination may differs from the Denomination at registration, so we may not be able to tinker with
// additional outputs.
bool tinkerWithAdditionalMixingLevels = CanUseAdditionalOutputs(newDenomination);
if (tinkerWithAdditionalMixingLevels)
{
foreach (MixingLevel level in MixingLevels.GetLevelsExceptBase())
{
IEnumerable <Bob> bobsOnThisLevel = Bobs.Where(x => x.Level == level);
if (bobsOnThisLevel.Count() <= 1)
{
break;
}
foreach (Bob bob in bobsOnThisLevel)
{
transaction.Outputs.AddWithOptimize(level.Denomination, bob.ActiveOutputAddress.ScriptPubKey);
}
}
}
BitcoinWitPubKeyAddress coordinatorAddress = Constants.GetCoordinatorAddress(Network);
// 3. If there are less Bobs than Alices, then add our own address. The malicious Alice, who will refuse to sign.
for (int i = 0; i < MixingLevels.Count(); i++)
{
var aliceCountInLevel = Alices.Count(x => i < x.BlindedOutputScripts.Length);
var missingBobCount = aliceCountInLevel - Bobs.Count(x => x.Level == MixingLevels.GetLevel(i));
for (int j = 0; j < missingBobCount; j++)
{
var denomination = MixingLevels.GetLevel(i).Denomination;
transaction.Outputs.AddWithOptimize(denomination, coordinatorAddress);
}
}
// 4. Start building Coordinator fee.
var baseDenominationOutputCount = transaction.Outputs.Count(x => x.Value == newDenomination);
Money coordinatorBaseFeePerAlice = newDenomination.Percentage(CoordinatorFeePercent * baseDenominationOutputCount);
Money coordinatorFee = baseDenominationOutputCount * coordinatorBaseFeePerAlice;
if (tinkerWithAdditionalMixingLevels)
{
foreach (MixingLevel level in MixingLevels.GetLevelsExceptBase())
{
var denominationOutputCount = transaction.Outputs.Count(x => x.Value == level.Denomination);
if (denominationOutputCount <= 1)
{
break;
}
Money coordinatorLevelFeePerAlice = level.Denomination.Percentage(CoordinatorFeePercent * denominationOutputCount);
coordinatorFee += coordinatorLevelFeePerAlice * denominationOutputCount;
}
}
// 5. Add the inputs and the changes of Alices.
var spentCoins = new List <Coin>();
foreach (Alice alice in Alices)
{
foreach (var input in alice.Inputs)
{
transaction.Inputs.Add(new TxIn(input.Outpoint));
spentCoins.Add(input);
}
Money changeAmount = alice.InputSum - alice.NetworkFeeToPay - newDenomination - coordinatorBaseFeePerAlice;
if (tinkerWithAdditionalMixingLevels)
{
for (int i = 1; i < alice.BlindedOutputScripts.Length; i++)
{
MixingLevel level = MixingLevels.GetLevel(i);
var denominationOutputCount = transaction.Outputs.Count(x => x.Value == level.Denomination);
if (denominationOutputCount <= 1)
{
break;
}
changeAmount -= (level.Denomination + FeePerOutputs + (level.Denomination.Percentage(CoordinatorFeePercent * denominationOutputCount)));
}
}
if (changeAmount > Money.Zero) // If the coordinator fee would make change amount to be negative or zero then no need to pay it.
{
Money minimumOutputAmount = Money.Coins(0.0001m); // If the change would be less than about $1 then add it to the coordinator.
Money onePercentOfDenomination = newDenomination.Percentage(1m); // If the change is less than about 1% of the newDenomination then add it to the coordinator fee.
Money minimumChangeAmount = Math.Max(minimumOutputAmount, onePercentOfDenomination);
if (changeAmount < minimumChangeAmount)
{
coordinatorFee += changeAmount;
}
else
{
transaction.Outputs.AddWithOptimize(changeAmount, alice.ChangeOutputAddress.ScriptPubKey);
}
}
else
{
// Alice has no money enough to pay the coordinator fee then allow her to pay what she can.
coordinatorFee += changeAmount;
}
}
// 6. Add Coordinator fee only if > about $3, else just let it to be miner fee.
if (coordinatorFee > Money.Coins(0.0003m))
{
transaction.Outputs.AddWithOptimize(coordinatorFee, coordinatorAddress);
}
// 7. Create the unsigned transaction.
var builder = Network.CreateTransactionBuilder();
UnsignedCoinJoin = builder
.ContinueToBuild(transaction)
.AddCoins(spentCoins) // It makes sure the UnsignedCoinJoin goes through TransactionBuilder optimizations.
.BuildTransaction(false);
// 8. Try optimize fees.
await OptimizeFeesAsync(spentCoins);
SignedCoinJoin = Transaction.Parse(UnsignedCoinJoin.ToHex(), Network);
Phase = CcjRoundPhase.Signing;
}
else
{
return;
}
Logger.LogInfo <CcjRound>($"Round ({RoundId}): Phase initialized: {expectedPhase.ToString()}.");
}