Exemplo n.º 1
0
 private static Block CreateGenesis(NetworkParameters n)
 {
     var genesisBlock = new Block(n);
     var t = new Transaction(n);
     try
     {
         // A script containing the difficulty bits and the following message:
         //
         //   "The Times 03/Jan/2009 Chancellor on brink of second bailout for banks"
         var bytes = Hex.Decode("04ffff001d0104455468652054696d65732030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66207365636f6e64206261696c6f757420666f722062616e6b73");
         t.AddInput(new TransactionInput(n, t, bytes));
         using (var scriptPubKeyBytes = new MemoryStream())
         {
             Script.WriteBytes(scriptPubKeyBytes, Hex.Decode("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f"));
             scriptPubKeyBytes.Write(Script.OpCheckSig);
             t.AddOutput(new TransactionOutput(n, scriptPubKeyBytes.ToArray()));
         }
     }
     catch (Exception)
     {
     }
     genesisBlock.AddTransaction(t);
     return genesisBlock;
 }
Exemplo n.º 2
0
        /// <summary>
        /// Creates a transaction that sends $coins.$cents BTC to the given address.
        /// </summary>
        /// <remarks>
        /// IMPORTANT: This method does NOT update the wallet. If you call createSend again you may get two transactions
        /// that spend the same coins. You have to call confirmSend on the created transaction to prevent this,
        /// but that should only occur once the transaction has been accepted by the network. This implies you cannot have
        /// more than one outstanding sending tx at once.
        /// </remarks>
        /// <param name="address">The BitCoin address to send the money to.</param>
        /// <param name="nanocoins">How much currency to send, in nanocoins.</param>
        /// <param name="changeAddress">
        /// Which address to send the change to, in case we can't make exactly the right value from
        /// our coins. This should be an address we own (is in the keychain).
        /// </param>
        /// <returns>
        /// A new <see cref="Transaction"/> or null if we cannot afford this send.
        /// </returns>
        internal Transaction CreateSend(Address address, ulong nanocoins, Address changeAddress)
        {
            lock (this)
            {
                _log.Info("Creating send tx to " + address + " for " +
                          Utils.BitcoinValueToFriendlyString(nanocoins));
                // To send money to somebody else, we need to do gather up transactions with unspent outputs until we have
                // sufficient value. Many coin selection algorithms are possible, we use a simple but suboptimal one.
                // TODO: Sort coins so we use the smallest first, to combat wallet fragmentation and reduce fees.
                var valueGathered = 0UL;
                var gathered = new LinkedList<TransactionOutput>();
                foreach (var tx in Unspent.Values)
                {
                    foreach (var output in tx.Outputs)
                    {
                        if (!output.IsAvailableForSpending) continue;
                        if (!output.IsMine(this)) continue;
                        gathered.AddLast(output);
                        valueGathered += output.Value;
                    }
                    if (valueGathered >= nanocoins) break;
                }
                // Can we afford this?
                if (valueGathered < nanocoins)
                {
                    _log.Info("Insufficient value in wallet for send, missing " +
                              Utils.BitcoinValueToFriendlyString(nanocoins - valueGathered));
                    // TODO: Should throw an exception here.
                    return null;
                }
                Debug.Assert(gathered.Count > 0);
                var sendTx = new Transaction(_params);
                sendTx.AddOutput(new TransactionOutput(_params, sendTx, nanocoins, address));
                var change = (long) (valueGathered - nanocoins);
                if (change > 0)
                {
                    // The value of the inputs is greater than what we want to send. Just like in real life then,
                    // we need to take back some coins ... this is called "change". Add another output that sends the change
                    // back to us.
                    _log.Info("  with " + Utils.BitcoinValueToFriendlyString((ulong) change) + " coins change");
                    sendTx.AddOutput(new TransactionOutput(_params, sendTx, (ulong) change, changeAddress));
                }
                foreach (var output in gathered)
                {
                    sendTx.AddInput(output);
                }

                // Now sign the inputs, thus proving that we are entitled to redeem the connected outputs.
                sendTx.SignInputs(Transaction.SigHash.All, this);
                _log.InfoFormat("  created {0}", sendTx.HashAsString);
                return sendTx;
            }
        }
Exemplo n.º 3
0
        /// <summary>
        /// Returns a solved block that builds on top of this one. This exists for unit tests.
        /// </summary>
        internal Block CreateNextBlock(Address to, uint time)
        {
            var b = new Block(Params);
            b.DifficultyTarget = _difficultyTarget;
            b.AddCoinbaseTransaction(_emptyBytes);

            // Add a transaction paying 50 coins to the "to" address.
            var t = new Transaction(Params);
            t.AddOutput(new TransactionOutput(Params, t, Utils.ToNanoCoins(50, 0), to));
            // The input does not really need to be a valid signature, as long as it has the right general form.
            var input = new TransactionInput(Params, t, Script.CreateInputScript(_emptyBytes, _emptyBytes));
            // Importantly the outpoint hash cannot be zero as that's how we detect a coinbase transaction in isolation
            // but it must be unique to avoid 'different' transactions looking the same.
            var counter = new byte[32];
            counter[0] = (byte) _txCounter++;
            input.Outpoint.Hash = new Sha256Hash(counter);
            t.AddInput(input);
            b.AddTransaction(t);

            b.PrevBlockHash = Hash;
            b.TimeSeconds = time;
            b.Solve();
            b.VerifyHeader();
            return b;
        }
Exemplo n.º 4
0
 /// <summary>
 /// Adds a coinbase transaction to the block. This exists for unit tests.
 /// </summary>
 internal void AddCoinbaseTransaction(Address to)
 {
     Transactions = new List<Transaction>();
     var coinbase = new Transaction(Params);
     // A real coinbase transaction has some stuff in the scriptSig like the extraNonce and difficulty. The
     // transactions are distinguished by every TX output going to a different key.
     //
     // Here we will do things a bit differently so a new address isn't needed every time. We'll put a simple
     // counter in the scriptSig so every transaction has a different hash. The output is also different.
     // Real coinbase transactions use <pubkey> OP_CHECKSIG rather than a send to an address though there's
     // nothing in the system that enforces that and both are just as valid.
     coinbase.AddInput(new TransactionInput(Params, coinbase, new[] {(byte) _coinbaseCounter++}));
     coinbase.AddOutput(new TransactionOutput(Params, coinbase, Utils.ToNanoCoins(50, 0), to));
     Transactions.Add(coinbase);
 }
Exemplo n.º 5
0
 /// <summary>
 /// Adds a coinbase transaction to the block. This exists for unit tests.
 /// </summary>
 internal void AddCoinbaseTransaction(byte[] pubKeyTo)
 {
     Transactions = new List<Transaction>();
     var coinbase = new Transaction(Params);
     // A real coinbase transaction has some stuff in the scriptSig like the extraNonce and difficulty. The
     // transactions are distinguished by every TX output going to a different key.
     //
     // Here we will do things a bit differently so a new address isn't needed every time. We'll put a simple
     // counter in the scriptSig so every transaction has a different hash.
     coinbase.AddInput(new TransactionInput(Params, coinbase, new[] {(byte) _txCounter++}));
     coinbase.AddOutput(new TransactionOutput(Params, coinbase, Script.CreateOutputScript(pubKeyTo)));
     Transactions.Add(coinbase);
 }