public bool VerifyTransaction(TransactionMsg transaction, out long txFee)
{
var blockComponent = new BlockComponent();
//step 0
if (transaction.Hash != transaction.GetHash())
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.TRANSACTION_HASH_ERROR);
}
//step 1
if (transaction.InputCount == 0 || transaction.OutputCount == 0)
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.INPUT_AND_OUTPUT_CANNOT_BE_EMPTY);
}
//step 2
if (transaction.Hash == Base16.Encode(HashHelper.EmptyHash()))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.HASH_CANNOT_BE_EMPTY);
}
//step 3
if (transaction.Locktime < 0 || transaction.Locktime > (Time.EpochTime + BlockSetting.LOCK_TIME_MAX))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.LOCK_TIME_EXCEEDED_THE_LIMIT);
}
//step 4
if (transaction.Serialize().Length < BlockSetting.TRANSACTION_MIN_SIZE)
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.TRANSACTION_SIZE_BELOW_THE_LIMIT);
}
//step 5
if (this.existsInDB(transaction.Hash))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.TRANSACTION_HAS_BEEN_EXISTED);
}
long totalOutput = 0;
long totalInput = 0;
foreach (var output in transaction.Outputs)
{
if (output.Amount <= 0 || output.Amount > BlockSetting.OUTPUT_AMOUNT_MAX)
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.OUTPUT_EXCEEDED_THE_LIMIT);
}
if (!Script.VerifyLockScriptFormat(output.LockScript))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.SCRIPT_FORMAT_ERROR);
}
totalOutput += output.Amount;
}
foreach (var input in transaction.Inputs)
{
if (!Script.VerifyUnlockScriptFormat(input.UnlockScript))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.SCRIPT_FORMAT_ERROR);
}
long amount;
string lockScript;
long blockHeight;
var result = this.getOutput(input.OutputTransactionHash, input.OutputIndex, out amount, out lockScript, out blockHeight);
if (result)
{
var utxoTx = this.GetTransactionMsgByHash(input.OutputTransactionHash);
if (utxoTx.InputCount == 1 && utxoTx.Inputs[0].OutputTransactionHash == Base16.Encode(HashHelper.EmptyHash()) &&
(blockHeight < 0 || (blockComponent.GetLatestHeight() - blockHeight < 100)))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.COINBASE_NEED_100_CONFIRMS);
}
if (Time.EpochTime < utxoTx.Locktime)
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.TRANSACTION_IS_LOCKED);
}
//check whether contain two or more same utxo in one transaction
var count = transaction.Inputs.Where(i => i.OutputTransactionHash == input.OutputTransactionHash && i.OutputIndex == input.OutputIndex).Count();
if (count > 1 || this.checkOutputSpent(transaction.Hash, input.OutputTransactionHash, input.OutputIndex))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.UTXO_HAS_BEEN_SPENT);
}
if (!Script.VerifyLockScriptByUnlockScript(input.OutputTransactionHash, input.OutputIndex, lockScript, input.UnlockScript))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.UTXO_UNLOCK_FAIL);
}
totalInput += amount;
}
else
{
//not found output, wait for other transactions or blocks;
txFee = 0;
return(false);
}
}
if (totalOutput >= totalInput)
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.OUTPUT_LARGE_THAN_INPUT);
}
if ((totalInput - totalOutput) < BlockSetting.TRANSACTION_MIN_FEE)
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.TRANSACTION_FEE_IS_TOO_FEW);
}
if (totalInput > BlockSetting.INPUT_AMOUNT_MAX)
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.INPUT_EXCEEDED_THE_LIMIT);
}
if (totalOutput > BlockSetting.OUTPUT_AMOUNT_MAX)
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.OUTPUT_EXCEEDED_THE_LIMIT);
}
txFee = totalInput - totalOutput;
return(true);
}
public bool VerifyBlock(BlockMsg newBlock)
{
if (this.exists(newBlock.Header.Hash))
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_HAS_BEEN_EXISTED);
}
if (newBlock.Header.Hash != newBlock.Header.GetHash())
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_HASH_ERROR);
}
var blockComponent = new BlockComponent();
var previousBlock = this.GetBlockMsgByHash(newBlock.Header.PreviousBlockHash);
if (newBlock.Header.Height > 0 && previousBlock == null)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.PREV_BLOCK_NOT_EXISTED);
}
if ((newBlock.Header.Timestamp > Time.EpochTime && (newBlock.Header.Timestamp - Time.EpochTime) > 2 * 60 * 60 * 1000) ||
(previousBlock != null && newBlock.Header.Timestamp <= previousBlock.Header.Timestamp))
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_TIME_IS_ERROR);
}
if (newBlock.Serialize().Length > BlockSetting.MAX_BLOCK_SIZE)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_SIZE_LARGE_THAN_LIMIT);
}
var txComponent = new TransactionComponent();
var newBlockReward = POC.GetNewBlockReward(newBlock.Header.Height);
var prevStepBlock = GetBlockMsgByHeight(newBlock.Header.Height - POC.DIFFIUCLTY_ADJUST_STEP - 1);
var minerInfo = string.Empty;
if (newBlock.Transactions.Count > 0)
{
var coinbase = newBlock.Transactions[0];
var totalFee = 0L;
minerInfo = Encoding.UTF8.GetString(Base16.Decode(coinbase.Inputs[0].UnlockScript)).Split("`")[0];
if (newBlock.Transactions.Count > 1)
{
for (int i = 1; i < newBlock.Transactions.Count; i++)
{
long fee;
if (txComponent.VerifyTransaction(newBlock.Transactions[i], out fee))
{
totalFee += fee;
}
else
{
return(false);
}
}
}
if (coinbase.Inputs.Count != 1 || coinbase.Outputs.Count != 1 || coinbase.Inputs[0].OutputTransactionHash != Base16.Encode(HashHelper.EmptyHash()))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.COINBASE_FORMAT_ERROR);
}
else
{
var output = coinbase.Outputs[0];
if (output.Amount > BlockSetting.OUTPUT_AMOUNT_MAX)
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.OUTPUT_EXCEEDED_THE_LIMIT);
}
if (!Script.VerifyLockScriptFormat(output.LockScript))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.SCRIPT_FORMAT_ERROR);
}
if (output.Amount != (totalFee + newBlockReward))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.COINBASE_OUTPUT_AMOUNT_ERROR);
}
}
}
var pool = new MiningPoolComponent().GetMiningPoolByName(minerInfo);
if (pool == null)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.MINING_POOL_NOT_EXISTED);
}
if (!POC.VerifyBlockSignature(newBlock.Header.PayloadHash, newBlock.Header.BlockSignature, pool.PublicKey))
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_SIGNATURE_IS_ERROR);
}
long previousBlockHeight = -1;
long previousBlockBits = -1;
if (previousBlock != null)
{
previousBlockHeight = previousBlock.Header.Height;
previousBlockBits = previousBlock.Header.Bits;
}
if (POC.CalculateBaseTarget(newBlock.Header.Height, previousBlock, prevStepBlock) != newBlock.Header.Bits)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BITS_IS_WRONG);
}
var targetResult = POC.CalculateTargetResult(newBlock);
if (POC.Verify(newBlock.Header.Bits, targetResult))
{
return(true);
}
else
{
throw new CommonException(ErrorCode.Engine.Block.Verify.POC_VERIFY_FAIL);
}
}
public bool VerifyBlock(BlockMsg newBlock)
{
if (this.exists(newBlock.Header.Hash))
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_HAS_BEEN_EXISTED);
}
if (newBlock.Header.Hash != newBlock.Header.GetHash())
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_HASH_ERROR);
}
var blockComponent = new BlockComponent();
var previousBlock = this.GetBlockMsgByHash(newBlock.Header.PreviousBlockHash);
if (newBlock.Header.Height > 0 && previousBlock == null)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.PREV_BLOCK_NOT_EXISTED);
}
if ((newBlock.Header.Timestamp > Time.EpochTime && (newBlock.Header.Timestamp - Time.EpochTime) > 2 * 60 * 60 * 1000) ||
(previousBlock != null && newBlock.Header.Timestamp <= previousBlock.Header.Timestamp))
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_TIME_IS_ERROR);
}
if (newBlock.Serialize().Length > BlockSetting.MAX_BLOCK_SIZE)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BLOCK_SIZE_LARGE_THAN_LIMIT);
}
var work = new POW(newBlock.Header.Height);
var txComponent = new TransactionComponent();
if (newBlock.Transactions.Count > 0)
{
var coinbase = newBlock.Transactions[0];
var reward = work.GetNewBlockReward();
var totalFee = 0L;
if (newBlock.Transactions.Count > 1)
{
for (int i = 1; i < newBlock.Transactions.Count; i++)
{
long fee;
if (txComponent.VerifyTransaction(newBlock.Transactions[i], out fee))
{
totalFee += fee;
}
else
{
return(false);
}
}
}
if (coinbase.Inputs.Count != 1 || coinbase.Outputs.Count != 1 || coinbase.Inputs[0].OutputTransactionHash != Base16.Encode(HashHelper.EmptyHash()))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.COINBASE_FORMAT_ERROR);
}
else
{
var output = coinbase.Outputs[0];
if (output.Amount > BlockSetting.OUTPUT_AMOUNT_MAX)
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.OUTPUT_EXCEEDED_THE_LIMIT);
}
if (!Script.VerifyLockScriptFormat(output.LockScript))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.SCRIPT_FORMAT_ERROR);
}
if (output.Amount != (totalFee + reward))
{
throw new CommonException(ErrorCode.Engine.Transaction.Verify.COINBASE_OUTPUT_AMOUNT_ERROR);
}
}
}
var prev4032Block = this.GetBlockMsgByHeight(newBlock.Header.Height - POW.DiffiucltyAdjustStep);
long previousBlockHeight = -1;
long previousBlockBits = -1;
if (previousBlock != null)
{
previousBlockHeight = previousBlock.Header.Height;
previousBlockBits = previousBlock.Header.Bits;
}
if (work.CalculateNextWorkTarget(previousBlockHeight, previousBlockBits, prev4032Block) != newBlock.Header.Bits)
{
throw new CommonException(ErrorCode.Engine.Block.Verify.BITS_IS_WRONG);
}
var hashResult = this.GetMiningWorkResult(newBlock);
if (work.Verify(newBlock.Header.Bits, hashResult))
{
return(true);
}
else
{
throw new CommonException(ErrorCode.Engine.Block.Verify.POW_VERIFY_FAIL);
}
}
