private ConcurrentDictionary<COutPoint, uint> mapStakeSeen = new ConcurrentDictionary<COutPoint, uint>();
- private ConcurrentDictionary<COutPoint, uint> mapStakeSeenOrphan = new ConcurrentDictionary<COutPoint, uint>();
+ private ConcurrentDictionary<Tuple<COutPoint, uint>, uint256> mapStakeSeenOrphan = new ConcurrentDictionary<Tuple<COutPoint, uint>, uint256>();
/// <summary>
));
// Write block to file.
- var itemTemplate = new CBlockStoreItem()
+ var rootCursor = new CBlockStoreItem()
{
nHeight = 0
};
- itemTemplate.FillHeader(genesisBlock.header);
+ rootCursor.FillHeader(genesisBlock.header);
- if (!AddItemToIndex(ref itemTemplate, ref genesisBlock))
+ if (!AddItemToIndex(ref rootCursor, ref genesisBlock))
{
throw new Exception("Unable to write genesis block");
}
// Init list of block items
foreach (var item in blockTreeItems)
{
+ item.nStakeModifierChecksum = StakeModifier.GetModifierChecksum(item);
+
blockMap.TryAdd(item.Hash, item);
if (item.IsProofOfStake)
return true;
}
- private bool AddItemToIndex(ref CBlockStoreItem itemTemplate, ref CBlock block)
+ private bool AddItemToIndex(ref CBlockStoreItem newCursor, ref CBlock block)
{
- uint256 blockHash = itemTemplate.Hash;
+ uint256 blockHash = newCursor.Hash;
if (blockMap.ContainsKey(blockHash))
{
dbConn.BeginTransaction();
// Compute chain trust score
- itemTemplate.nChainTrust = (itemTemplate.prev != null ? itemTemplate.prev.nChainTrust : 0) + itemTemplate.nBlockTrust;
+ newCursor.nChainTrust = (newCursor.prev != null ? newCursor.prev.nChainTrust : 0) + newCursor.nBlockTrust;
- if (!itemTemplate.SetStakeEntropyBit(Entropy.GetStakeEntropyBit(itemTemplate.nHeight, blockHash)))
+ if (!newCursor.SetStakeEntropyBit(Entropy.GetStakeEntropyBit(newCursor.nHeight, blockHash)))
{
return false; // SetStakeEntropyBit() failed
}
// compute stake modifier
long nStakeModifier = 0;
bool fGeneratedStakeModifier = false;
- if (!StakeModifier.ComputeNextStakeModifier(itemTemplate, ref nStakeModifier, ref fGeneratedStakeModifier))
+ if (!StakeModifier.ComputeNextStakeModifier(ref newCursor, ref nStakeModifier, ref fGeneratedStakeModifier))
{
return false; // ComputeNextStakeModifier() failed
}
- itemTemplate.SetStakeModifier(nStakeModifier, fGeneratedStakeModifier);
- itemTemplate.nStakeModifierChecksum = StakeModifier.GetStakeModifierChecksum(ref itemTemplate);
+ newCursor.SetStakeModifier(nStakeModifier, fGeneratedStakeModifier);
+ newCursor.nStakeModifierChecksum = StakeModifier.GetModifierChecksum(newCursor);
- // TODO: verify stake modifier checkpoints
+ if (!ModifierCheckpoints.Verify(newCursor.nHeight, newCursor.nStakeModifierChecksum))
+ {
+ return false; // Stake modifier checkpoints mismatch
+ }
// Add to index
if (block.IsProofOfStake)
{
- itemTemplate.SetProofOfStake();
+ newCursor.SetProofOfStake();
- itemTemplate.prevoutStake = block.vtx[1].vin[0].prevout;
- itemTemplate.nStakeTime = block.vtx[1].nTime;
+ newCursor.prevoutStake = block.vtx[1].vin[0].prevout;
+ newCursor.nStakeTime = block.vtx[1].nTime;
// Save proof-of-stake hash value
uint256 hashProofOfStake;
{
return false; // hashProofOfStake not found
}
- itemTemplate.hashProofOfStake = hashProofOfStake;
+ newCursor.hashProofOfStake = hashProofOfStake;
}
- if (!itemTemplate.WriteToFile(ref fStreamReadWrite, ref block))
+ if (!newCursor.WriteToFile(ref fStreamReadWrite, ref block))
{
return false;
}
- if (dbConn.Insert(itemTemplate) == 0)
+ if (dbConn.Insert(newCursor) == 0)
{
return false; // Insert failed
}
// Get last RowID.
- itemTemplate.ItemID = dbPlatform.SQLiteApi.LastInsertRowid(dbConn.Handle);
+ newCursor.ItemID = dbPlatform.SQLiteApi.LastInsertRowid(dbConn.Handle);
- if (!blockMap.TryAdd(blockHash, itemTemplate))
+ if (!blockMap.TryAdd(blockHash, newCursor))
{
return false; // blockMap add failed
}
- if (itemTemplate.nChainTrust > ChainParams.nBestChainTrust)
+ if (newCursor.nChainTrust > ChainParams.nBestChainTrust)
{
// New best chain
- if (!SetBestChain(ref itemTemplate))
+ if (!SetBestChain(ref newCursor))
{
return false; // SetBestChain failed.
}
return false; // Invalid block found.
}
- bool fScriptChecks = cursor.nHeight >= Checkpoints.TotalBlocksEstimate;
+ bool fScriptChecks = cursor.nHeight >= HashCheckpoints.TotalBlocksEstimate;
var scriptFlags = scriptflag.SCRIPT_VERIFY_NOCACHE | scriptflag.SCRIPT_VERIFY_P2SH;
- ulong nFees = 0;
- ulong nValueIn = 0;
- ulong nValueOut = 0;
+ long nFees = 0;
+ long nValueIn = 0;
+ long nValueOut = 0;
uint nSigOps = 0;
var queuedMerkleNodes = new Dictionary<uint256, CMerkleNode>();
return false; // too many sigops
}
- ulong nTxValueIn = tx.GetValueIn(ref inputs);
- ulong nTxValueOut = tx.nValueOut;
+ long nTxValueIn = tx.GetValueIn(ref inputs);
+ long nTxValueOut = tx.nValueOut;
nValueIn += nTxValueIn;
nValueOut += nTxValueOut;
if (!block.IsProofOfStake)
{
- ulong nBlockReward = CBlock.GetProofOfWorkReward(cursor.nBits, nFees);
+ long nBlockReward = CBlock.GetProofOfWorkReward(cursor.nBits, nFees);
// Check coinbase reward
if (block.vtx[0].nValueOut > nBlockReward)
}
}
- cursor.nMint = (long)(nValueOut - nValueIn + nFees);
- cursor.nMoneySupply = (cursor.prev != null ? cursor.prev.nMoneySupply : 0) + (long)nValueOut - (long)nValueIn;
+ cursor.nMint = nValueOut - nValueIn + nFees;
+ cursor.nMoneySupply = (cursor.prev != null ? cursor.prev.nMoneySupply : 0) + nValueOut - nValueIn;
if (!UpdateDBCursor(ref cursor))
{
if (!tx.IsCoinBase)
{
- ulong nValueIn = 0;
- ulong nFees = 0;
+ long nValueIn = 0;
+ long nFees = 0;
for (uint i = 0; i < tx.vin.Length; i++)
{
var prevout = tx.vin[i].prevout;
if (tx.IsCoinStake)
{
- // ppcoin: coin stake tx earns reward instead of paying fee
- ulong nCoinAge;
- if (!tx.GetCoinAge(ref inputs, out nCoinAge))
+ if (HashCheckpoints.LastCheckpointTime < tx.nTime)
{
- return false; // unable to get coin age for coinstake
- }
-
- ulong nReward = tx.nValueOut - nValueIn;
+ // Coin stake tx earns reward instead of paying fee
+ long nCoinAge;
+ if (!tx.GetCoinAge(ref inputs, out nCoinAge))
+ {
+ return false; // unable to get coin age for coinstake
+ }
- ulong nCalculatedReward = CBlock.GetProofOfStakeReward(nCoinAge, cursorBlock.nBits, tx.nTime) - tx.GetMinFee(1, false, CTransaction.MinFeeMode.GMF_BLOCK) + CTransaction.nCent;
+ long nReward = tx.nValueOut - nValueIn;
+ long nCalculatedReward = CBlock.GetProofOfStakeReward(nCoinAge, cursorBlock.nBits, tx.nTime) - tx.GetMinFee(1, false, CTransaction.MinFeeMode.GMF_BLOCK) + CTransaction.nCent;
- if (nReward > nCalculatedReward)
- {
- return false; // coinstake pays too much
+ if (nReward > nCalculatedReward)
+ {
+ return false; // coinstake pays too much
+ }
}
}
else
}
// Tally transaction fees
- ulong nTxFee = nValueIn - tx.nValueOut;
+ long nTxFee = nValueIn - tx.nValueOut;
if (nTxFee < 0)
{
return false; // nTxFee < 0
var prevBlockHeader = prevBlockCursor.BlockHeader;
- // TODO: proof-of-work/proof-of-stake verification
uint nHeight = prevBlockCursor.nHeight + 1;
// Check timestamp against prev
}
}
- // TODO: Enforce rule that the coinbase starts with serialized block height
+ // Check that the block chain matches the known block chain up to a checkpoint
+ if (!HashCheckpoints.Verify(nHeight, nHash))
+ {
+ return false; // rejected by checkpoint lock-in
+ }
+
+ // Enforce rule that the coinbase starts with serialized block height
+ var expect = new CScript();
+ expect.AddNumber((int)nHeight);
+
+ byte[] expectBytes = expect;
+ byte[] scriptSig = block.vtx[0].vin[0].scriptSig;
+
+ if (!expectBytes.SequenceEqual(scriptSig.Take(expectBytes.Length)))
+ {
+ return false; // coinbase doesn't start with serialized height.
+ }
// Write block to file.
- var itemTemplate = new CBlockStoreItem()
+ var newCursor = new CBlockStoreItem()
{
nHeight = nHeight,
};
- itemTemplate.FillHeader(block.header);
+ newCursor.FillHeader(block.header);
- if (!AddItemToIndex(ref itemTemplate, ref block))
+ if (!AddItemToIndex(ref newCursor, ref block))
{
dbConn.Rollback();
}
/// <summary>
- /// GEt block by hash.
+ /// Get block by hash.
/// </summary>
/// <param name="blockHash">Block hash</param>
/// <param name="block">Block object reference</param>
if (block.IsProofOfStake)
{
- // TODO: proof-of-stake validation
-
uint256 hashProofOfStake = 0, targetProofOfStake = 0;
if (!StakeModifier.CheckProofOfStake(block.vtx[1], block.header.nBits, out hashProofOfStake, out targetProofOfStake))
{
{
if (block.IsProofOfStake)
{
- // TODO: limit duplicity on stake
+ var proof = block.ProofOfStake;
+
+ // Limited duplicity on stake: prevents block flood attack
+ // Duplicate stake allowed only when there is orphan child block
+ if (mapStakeSeenOrphan.ContainsKey(proof) && !orphanMapByPrev.ContainsKey(blockHash))
+ {
+ return false; // duplicate proof-of-stake
+ }
+ else
+ {
+ mapStakeSeenOrphan.TryAdd(proof, blockHash);
+ }
}
- var block2 = new CBlock(block);
- orphanMap.TryAdd(blockHash, block2);
- orphanMapByPrev.TryAdd(blockHash, block2);
+ orphanMap.TryAdd(blockHash, block);
+ orphanMapByPrev.TryAdd(blockHash, block);
return true;
}
return false;
}
- // Recursively process any orphan blocks that depended on this one
- var orphansQueue = new List<uint256>();
- orphansQueue.Add(blockHash);
-
- for (int i = 0; i < orphansQueue.Count; i++)
+ if (orphanMapByPrev.Count > 0)
{
- var hashPrev = orphansQueue[i];
+ // Recursively process any orphan blocks that depended on this one
+
+ var orphansQueue = new List<uint256>();
+ orphansQueue.Add(blockHash);
- foreach (var pair in orphanMap)
+ for (int i = 0; i < orphansQueue.Count; i++)
{
- var orphanBlock = pair.Value;
+ var hashPrev = orphansQueue[i];
- if (orphanBlock.header.prevHash == blockHash)
+ foreach (var pair in orphanMapByPrev)
{
- if (AcceptBlock(ref orphanBlock))
+ var orphanBlock = pair.Value;
+
+ if (orphanBlock.header.prevHash == blockHash)
{
- orphansQueue.Add(pair.Key);
- }
+ if (AcceptBlock(ref orphanBlock))
+ {
+ orphansQueue.Add(pair.Key);
+ }
- CBlock dummy1;
- orphanMap.TryRemove(pair.Key, out dummy1);
+ CBlock dummy1;
+ orphanMap.TryRemove(pair.Key, out dummy1);
+
+ uint256 dummyHash;
+ mapStakeSeenOrphan.TryRemove(orphanBlock.ProofOfStake, out dummyHash);
+ }
}
- }
- CBlock dummy2;
- orphanMap.TryRemove(hashPrev, out dummy2);
+ CBlock dummy2;
+ orphanMapByPrev.TryRemove(hashPrev, out dummy2);
+ }
}
return true;
git://git.novaco.in / NovacoinLibrary.git / blobdiff