public static byte[] Serialize(this SlimBlock slimBlock)
{
// These buffers will be concatenated to create the full block;
List <byte[]> parts = new List <byte[]>();
// Block header
parts.Add(slimBlock.SlimBlockHeader.Data);
// Number of tx in the block
byte[] nTransactions = new byte[1];
// this must be VarInt, todo: use real varint
var txCount = slimBlock.IsProofOfStake ? slimBlock.PayloadTransactions.Count + 2 : slimBlock.PayloadTransactions.Count + 1;
if (txCount > 252)
{
throw new InvalidOperationException($"Value of {txCount} needs a real VarInt");
}
nTransactions[0] = (byte)txCount;
parts.Add(nTransactions);
// Transactions
var coinbaseTxBytes = slimBlock.CoinbaseTransaction.ToBytes();
parts.Add(coinbaseTxBytes);
if (slimBlock.IsProofOfStake)
{
Debug.Assert(slimBlock.CoinstakeTransaction.IsCoinstake());
var coinstakeTxBytes = slimBlock.CoinstakeTransaction.ToBytes();
parts.Add(coinstakeTxBytes);
}
foreach (var payloadTransaction in slimBlock.PayloadTransactions)
{
parts.Add(payloadTransaction.ToBytes());
}
// Block signature as VarString. First byte of VarString is length as VarInt
if (slimBlock.IsProofOfStake)
{
// 252 (0xfc) is the max for a 1-byte VarInt, and we assume the signature is not longer
Debug.Assert(slimBlock.SignatureBytes.Length <= 252);
parts.Add(slimBlock.SignatureBytes); // SignatureBytes is written by the BlockSignature ReadWrite method. This should already be in VarString format.
//byte[] signature = new byte[1 + slimBlock.SignatureBytes.Length];
//signature[0] = (byte)slimBlock.SignatureBytes.Length;
//Buffer.BlockCopy(slimBlock.SignatureBytes, 0, signature, 1, slimBlock.SignatureBytes.Length);
//parts.Add(signature);
}
else
{
parts.Add(slimBlock.SignatureBytes);
}
var blockBytes = ByteArrays.Concatenate(parts.ToArray());
return(blockBytes);
}
public static void AddPoSCoinbaseTransaction(this SlimBlock slimBlock)
{
slimBlock.CoinbaseTransaction = C.Network.CreateTransaction();
slimBlock.CoinbaseTransaction.Inputs.Add(new TxIn
{
ScriptSig = new Script(Op.GetPushOp(slimBlock.Height)) + OpcodeType.OP_0, WitScript = CoinbaseWitScript
});
slimBlock.CoinbaseTransaction.Outputs.Add(new TxOut(0, new Script()));
}
public static void CreateWitnessCommitment(this SlimBlock slimBlock)
{
if (slimBlock.CoinbaseTransaction == null || slimBlock.PayloadTransactions == null)
{
throw new ArgumentException();
}
if (slimBlock.IsProofOfStake && slimBlock.CoinstakeTransaction == null)
{
throw new ArgumentException();
}
if (slimBlock.CoinbaseTransaction.Inputs[0].WitScript == WitScript.Empty)
{
throw new ArgumentException();
}
byte[] witnessRootHash;
if (slimBlock.IsProofOfStake)
{
List <Transaction> coinStakeAndPayload = new List <Transaction>(slimBlock.PayloadTransactions);
coinStakeAndPayload.Insert(0, slimBlock.CoinstakeTransaction);
witnessRootHash = BlockWitnessMerkleRoot(coinStakeAndPayload);
}
else
{
witnessRootHash = BlockWitnessMerkleRoot(slimBlock.PayloadTransactions);
}
// // Coinbase's input's witness must consist of a single 32-byte array for the witness reserved value.
byte[] witnessReservedValue = new byte[32];
byte[] dataToHash = new byte[64]; // witness root hash << witness reserved value
Buffer.BlockCopy(witnessRootHash, 0, dataToHash, 0, 32);
Buffer.BlockCopy(witnessReservedValue, 0, dataToHash, 32, 32);
// 32-byte - Commitment hash: Double-SHA256(witness root hash|witness reserved value)
byte[] commitmentHash = Hashes.DoubleSHA256(dataToHash).ToBytes();
// The commitment is recorded in a scriptPubKey of the coinbase transaction.
var coinbaseScriptPubKeyFiledBytes = new byte[38]; // It must be at least 38 bytes, with the first 6-byte of 0x6a24aa21a9ed.
coinbaseScriptPubKeyFiledBytes[0] = 0x6a; // OP_RETURN (0x6a)
coinbaseScriptPubKeyFiledBytes[1] = 0x24; // Push the following 36 bytes (0x24)
coinbaseScriptPubKeyFiledBytes[2] = 0xaa; // Commitment header (0xaa21a9ed)
coinbaseScriptPubKeyFiledBytes[3] = 0x21;
coinbaseScriptPubKeyFiledBytes[4] = 0xa9;
coinbaseScriptPubKeyFiledBytes[5] = 0xed;
Buffer.BlockCopy(commitmentHash, 0, coinbaseScriptPubKeyFiledBytes, 6, 32);
// Write the coinbase commitment to a ScriptPubKey structure.
var txOut = new TxOut(Money.Zero, new Script(coinbaseScriptPubKeyFiledBytes));
// If there are more than one scriptPubKey matching the pattern, the one with highest output index is assumed to be the commitment.
slimBlock.CoinbaseTransaction.Outputs.Add(txOut);
}
public static void UpdateHeaderHashMerkleRoot(this SlimBlock slimBlock)
{
var txHashes = new List <byte[]>();
txHashes.Add(slimBlock.CoinbaseTransaction.GetHash().ToBytes());
if (slimBlock.IsProofOfStake)
{
txHashes.Add(slimBlock.CoinstakeTransaction.GetHash().ToBytes());
}
foreach (var transaction in slimBlock.PayloadTransactions)
{
txHashes.Add(transaction.GetHash().ToBytes());
}
var hashMerkleRoot = MerkleRoot.Build(txHashes);
slimBlock.SlimBlockHeader.MerkleRoot = hashMerkleRoot;
slimBlock.SlimBlockHeader.Data = slimBlock.SlimBlockHeader.SerializeTo80Bytes();
}
public static void AddPoWCoinbaseTransaction(this SlimBlock slimBlock, Script scriptPubkey, Money value, long extraNonce)
{
if (slimBlock.IsProofOfStake || slimBlock.Height == 0)
{
throw new InvalidOperationException();
}
// txCoinbase.vin[0].scriptSig = (CScript() << nHeight << CScriptNum(nExtraNonce));
var heightScriptBytes = new Script(Op.GetPushOp(slimBlock.Height)).ToBytes();
var extraNonceScriptBytes = new CScriptNum(extraNonce).getvch();
var scriptSigBytes = new byte[heightScriptBytes.Length + extraNonceScriptBytes.Length];
Buffer.BlockCopy(heightScriptBytes, 0, scriptSigBytes, 0, heightScriptBytes.Length);
Buffer.BlockCopy(extraNonceScriptBytes, 0, scriptSigBytes, heightScriptBytes.Length, extraNonceScriptBytes.Length);
slimBlock.CoinbaseTransaction = C.Network.CreateTransaction();
slimBlock.CoinbaseTransaction.Inputs.Add(new TxIn
{
ScriptSig = new Script(scriptSigBytes), WitScript = CoinbaseWitScript
});
slimBlock.CoinbaseTransaction.Outputs.Add(new TxOut(value, scriptPubkey));
}
public static void SetPayloadTransactions(this SlimBlock slimBlock, IEnumerable <Transaction> transactions)
{
slimBlock.PayloadTransactions = transactions.ToList();
}