BitSharper.Block.VerifyTransactions C# (CSharp) Method

        public void VerifyTransactions()
        {
            // Now we need to check that the body of the block actually matches the headers. The network won't generate
            // an invalid block, but if we didn't validate this then an untrusted man-in-the-middle could obtain the next
            // valid block from the network and simply replace the transactions in it with their own fictional
            // transactions that reference spent or non-existant inputs.
            Debug.Assert(Transactions.Count > 0);
            CheckTransactions();
            CheckMerkleRoot();
        }

        /// <exception cref="BlockStoreException"/>
        /// <exception cref="VerificationException"/>
        /// <exception cref="ScriptException"/>
        private bool Add(Block block, bool tryConnecting)
        {
            lock (this)
            {
                if (Environment.TickCount - _statsLastTime > 1000)
                {
                    // More than a second passed since last stats logging.
                    _log.InfoFormat("{0} blocks per second", _statsBlocksAdded);
                    _statsLastTime = Environment.TickCount;
                    _statsBlocksAdded = 0;
                }
                // We check only the chain head for double adds here to avoid potentially expensive block chain misses.
                if (block.Equals(_chainHead.Header))
                {
                    // Duplicate add of the block at the top of the chain, can be a natural artifact of the download process.
                    return true;
                }

                // Does this block contain any transactions we might care about? Check this up front before verifying the
                // blocks validity so we can skip the merkle root verification if the contents aren't interesting. This saves
                // a lot of time for big blocks.
                var contentsImportant = false;
                var walletToTxMap = new Dictionary<Wallet, List<Transaction>>();
                if (block.Transactions != null)
                {
                    ScanTransactions(block, walletToTxMap);
                    contentsImportant = walletToTxMap.Count > 0;
                }

                // Prove the block is internally valid: hash is lower than target, etc. This only checks the block contents
                // if there is a tx sending or receiving coins using an address in one of our wallets. And those transactions
                // are only lightly verified: presence in a valid connecting block is taken as proof of validity. See the
                // article here for more details: http://code.google.com/p/bitcoinj/wiki/SecurityModel
                try
                {
                    block.VerifyHeader();
                    if (contentsImportant)
                        block.VerifyTransactions();
                }
                catch (VerificationException e)
                {
                    _log.Error("Failed to verify block:", e);
                    _log.Error(block.HashAsString);
                    throw;
                }

                // Try linking it to a place in the currently known blocks.
                var storedPrev = _blockStore.Get(block.PrevBlockHash);

                if (storedPrev == null)
                {
                    // We can't find the previous block. Probably we are still in the process of downloading the chain and a
                    // block was solved whilst we were doing it. We put it to one side and try to connect it later when we
                    // have more blocks.
                    _log.WarnFormat("Block does not connect: {0}", block.HashAsString);
                    _unconnectedBlocks.Add(block);
                    return false;
                }
                // It connects to somewhere on the chain. Not necessarily the top of the best known chain.
                //
                // Create a new StoredBlock from this block. It will throw away the transaction data so when block goes
                // out of scope we will reclaim the used memory.
                var newStoredBlock = storedPrev.Build(block);
                CheckDifficultyTransitions(storedPrev, newStoredBlock);
                _blockStore.Put(newStoredBlock);
                ConnectBlock(newStoredBlock, storedPrev, walletToTxMap);

                if (tryConnecting)
                    TryConnectingUnconnected();

                _statsBlocksAdded++;
                return true;
            }
        }