private void parsePaymentRequest(Protos.PaymentRequest request) throws PaymentProtocolException {
   try {
     if (request == null) throw new PaymentProtocolException("request cannot be null");
     if (request.getPaymentDetailsVersion() != 1)
       throw new PaymentProtocolException.InvalidVersion(
           "Version 1 required. Received version " + request.getPaymentDetailsVersion());
     paymentRequest = request;
     if (!request.hasSerializedPaymentDetails())
       throw new PaymentProtocolException("No PaymentDetails");
     paymentDetails =
         Protos.PaymentDetails.newBuilder()
             .mergeFrom(request.getSerializedPaymentDetails())
             .build();
     if (paymentDetails == null) throw new PaymentProtocolException("Invalid PaymentDetails");
     if (!paymentDetails.hasNetwork()) params = MainNetParams.get();
     else params = NetworkParameters.fromPmtProtocolID(paymentDetails.getNetwork());
     if (params == null)
       throw new PaymentProtocolException.InvalidNetwork(
           "Invalid network " + paymentDetails.getNetwork());
     if (paymentDetails.getOutputsCount() < 1)
       throw new PaymentProtocolException.InvalidOutputs("No outputs");
     for (Protos.Output output : paymentDetails.getOutputsList()) {
       if (output.hasAmount()) totalValue = totalValue.add(Coin.valueOf(output.getAmount()));
     }
     // This won't ever happen in practice. It would only happen if the user provided outputs
     // that are obviously invalid. Still, we don't want to silently overflow.
     if (params.hasMaxMoney() && totalValue.compareTo(params.getMaxMoney()) > 0)
       throw new PaymentProtocolException.InvalidOutputs("The outputs are way too big.");
   } catch (InvalidProtocolBufferException e) {
     throw new PaymentProtocolException(e);
   }
 }
 /**
  * Creates the initial multisig contract and incomplete refund transaction which can be requested
  * at the appropriate time using {@link PaymentChannelClientState#getIncompleteRefundTransaction}
  * and {@link PaymentChannelClientState#getMultisigContract()}. The way the contract is crafted
  * can be adjusted by overriding {@link
  * PaymentChannelClientState#editContractSendRequest(com.google.bitcoin.core.Wallet.SendRequest)}.
  * By default unconfirmed coins are allowed to be used, as for micropayments the risk should be
  * relatively low.
  *
  * @throws ValueOutOfRangeException if the value being used is too small to be accepted by the
  *     network
  * @throws InsufficientMoneyException if the wallet doesn't contain enough balance to initiate
  */
 public synchronized void initiate() throws ValueOutOfRangeException, InsufficientMoneyException {
   final NetworkParameters params = wallet.getParams();
   Transaction template = new Transaction(params);
   // We always place the client key before the server key because, if either side wants some
   // privacy, they can
   // use a fresh key for the the multisig contract and nowhere else
   List<ECKey> keys = Lists.newArrayList(myKey, serverMultisigKey);
   // There is also probably a change output, but we don't bother shuffling them as it's obvious
   // from the
   // format which one is the change. If we start obfuscating the change output better in future
   // this may
   // be worth revisiting.
   TransactionOutput multisigOutput =
       template.addOutput(totalValue, ScriptBuilder.createMultiSigOutputScript(2, keys));
   if (multisigOutput.getMinNonDustValue().compareTo(totalValue) > 0)
     throw new ValueOutOfRangeException("totalValue too small to use");
   Wallet.SendRequest req = Wallet.SendRequest.forTx(template);
   req.coinSelector = AllowUnconfirmedCoinSelector.get();
   editContractSendRequest(req);
   req.shuffleOutputs = false; // TODO: Fix things so shuffling is usable.
   wallet.completeTx(req);
   Coin multisigFee = req.tx.getFee();
   multisigContract = req.tx;
   // Build a refund transaction that protects us in the case of a bad server that's just trying to
   // cause havoc
   // by locking up peoples money (perhaps as a precursor to a ransom attempt). We time lock it so
   // the server
   // has an assurance that we cannot take back our money by claiming a refund before the channel
   // closes - this
   // relies on the fact that since Bitcoin 0.8 time locked transactions are non-final. This will
   // need to change
   // in future as it breaks the intended design of timelocking/tx replacement, but for now it
   // simplifies this
   // specific protocol somewhat.
   refundTx = new Transaction(params);
   refundTx
       .addInput(multisigOutput)
       .setSequenceNumber(0); // Allow replacement when it's eventually reactivated.
   refundTx.setLockTime(expiryTime);
   if (totalValue.compareTo(Coin.CENT) < 0) {
     // Must pay min fee.
     final Coin valueAfterFee = totalValue.subtract(Transaction.REFERENCE_DEFAULT_MIN_TX_FEE);
     if (Transaction.MIN_NONDUST_OUTPUT.compareTo(valueAfterFee) > 0)
       throw new ValueOutOfRangeException("totalValue too small to use");
     refundTx.addOutput(valueAfterFee, myKey.toAddress(params));
     refundFees = multisigFee.add(Transaction.REFERENCE_DEFAULT_MIN_TX_FEE);
   } else {
     refundTx.addOutput(totalValue, myKey.toAddress(params));
     refundFees = multisigFee;
   }
   refundTx.getConfidence().setSource(TransactionConfidence.Source.SELF);
   log.info(
       "initiated channel with multi-sig contract {}, refund {}",
       multisigContract.getHashAsString(),
       refundTx.getHashAsString());
   state = State.INITIATED;
   // Client should now call getIncompleteRefundTransaction() and send it to the server.
 }
 /**
  * Returns the outstanding amount of money sent back to us for all channels to this server added
  * together.
  */
 public Coin getBalanceForServer(Sha256Hash id) {
   Coin balance = Coin.ZERO;
   lock.lock();
   try {
     Set<StoredClientChannel> setChannels = mapChannels.get(id);
     for (StoredClientChannel channel : setChannels) {
       synchronized (channel) {
         if (channel.close != null) continue;
         balance = balance.add(channel.valueToMe);
       }
     }
     return balance;
   } finally {
     lock.unlock();
   }
 }
 @Override
 public CoinSelection select(Coin target, List<TransactionOutput> candidates) {
   try {
     LinkedList<TransactionOutput> gathered = Lists.newLinkedList();
     Coin valueGathered = Coin.ZERO;
     for (TransactionOutput output : candidates) {
       if (ignorePending && !isConfirmed(output)) continue;
       // Find the key that controls output, assuming it's a regular pay-to-pubkey or
       // pay-to-address output.
       // We ignore any other kind of exotic output on the assumption we can't spend it ourselves.
       final Script scriptPubKey = output.getScriptPubKey();
       ECKey controllingKey;
       if (scriptPubKey.isSentToRawPubKey()) {
         controllingKey = wallet.findKeyFromPubKey(scriptPubKey.getPubKey());
       } else if (scriptPubKey.isSentToAddress()) {
         controllingKey = wallet.findKeyFromPubHash(scriptPubKey.getPubKeyHash());
       } else {
         log.info("Skipping tx output {} because it's not of simple form.", output);
         continue;
       }
       checkNotNull(
           controllingKey, "Coin selector given output as candidate for which we lack the key");
       if (controllingKey.getCreationTimeSeconds() >= unixTimeSeconds) continue;
       // It's older than the cutoff time so select.
       valueGathered = valueGathered.add(output.getValue());
       gathered.push(output);
       if (gathered.size() >= MAX_SIMULTANEOUS_INPUTS) {
         log.warn(
             "Reached {} inputs, going further would yield a tx that is too large, stopping here.",
             gathered.size());
         break;
       }
     }
     return new CoinSelection(valueGathered, gathered);
   } catch (ScriptException e) {
     throw new RuntimeException(
         e); // We should never have problems understanding scripts in our wallet.
   }
 }
  @Override
  /** Used during reorgs to connect a block previously on a fork */
  protected synchronized TransactionOutputChanges connectTransactions(StoredBlock newBlock)
      throws VerificationException, BlockStoreException, PrunedException {
    checkState(lock.isHeldByCurrentThread());
    if (!params.passesCheckpoint(newBlock.getHeight(), newBlock.getHeader().getHash()))
      throw new VerificationException("Block failed checkpoint lockin at " + newBlock.getHeight());

    blockStore.beginDatabaseBatchWrite();
    StoredUndoableBlock block = blockStore.getUndoBlock(newBlock.getHeader().getHash());
    if (block == null) {
      // We're trying to re-org too deep and the data needed has been deleted.
      blockStore.abortDatabaseBatchWrite();
      throw new PrunedException(newBlock.getHeader().getHash());
    }
    TransactionOutputChanges txOutChanges;
    try {
      List<Transaction> transactions = block.getTransactions();
      if (transactions != null) {
        LinkedList<StoredTransactionOutput> txOutsSpent = new LinkedList<StoredTransactionOutput>();
        LinkedList<StoredTransactionOutput> txOutsCreated =
            new LinkedList<StoredTransactionOutput>();
        long sigOps = 0;
        final boolean enforcePayToScriptHash =
            newBlock.getHeader().getTimeSeconds() >= NetworkParameters.BIP16_ENFORCE_TIME;
        if (!params.isCheckpoint(newBlock.getHeight())) {
          for (Transaction tx : transactions) {
            Sha256Hash hash = tx.getHash();
            if (blockStore.hasUnspentOutputs(hash, tx.getOutputs().size()))
              throw new VerificationException("Block failed BIP30 test!");
          }
        }
        Coin totalFees = Coin.ZERO;
        Coin coinbaseValue = null;

        if (scriptVerificationExecutor.isShutdown())
          scriptVerificationExecutor =
              Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
        List<Future<VerificationException>> listScriptVerificationResults =
            new ArrayList<Future<VerificationException>>(transactions.size());
        for (final Transaction tx : transactions) {
          boolean isCoinBase = tx.isCoinBase();
          Coin valueIn = Coin.ZERO;
          Coin valueOut = Coin.ZERO;
          final List<Script> prevOutScripts = new LinkedList<Script>();
          if (!isCoinBase) {
            for (int index = 0; index < tx.getInputs().size(); index++) {
              final TransactionInput in = tx.getInputs().get(index);
              final StoredTransactionOutput prevOut =
                  blockStore.getTransactionOutput(
                      in.getOutpoint().getHash(), in.getOutpoint().getIndex());
              if (prevOut == null)
                throw new VerificationException(
                    "Attempted spend of a non-existent or already spent output!");
              if (newBlock.getHeight() - prevOut.getHeight() < params.getSpendableCoinbaseDepth())
                throw new VerificationException(
                    "Tried to spend coinbase at depth "
                        + (newBlock.getHeight() - prevOut.getHeight()));
              valueIn = valueIn.add(prevOut.getValue());
              if (enforcePayToScriptHash) {
                Script script = new Script(prevOut.getScriptBytes());
                if (script.isPayToScriptHash())
                  sigOps += Script.getP2SHSigOpCount(in.getScriptBytes());
                if (sigOps > Block.MAX_BLOCK_SIGOPS)
                  throw new VerificationException("Too many P2SH SigOps in block");
              }

              prevOutScripts.add(new Script(prevOut.getScriptBytes()));

              blockStore.removeUnspentTransactionOutput(prevOut);
              txOutsSpent.add(prevOut);
            }
          }
          Sha256Hash hash = tx.getHash();
          for (TransactionOutput out : tx.getOutputs()) {
            valueOut = valueOut.add(out.getValue());
            StoredTransactionOutput newOut =
                new StoredTransactionOutput(
                    hash,
                    out.getIndex(),
                    out.getValue(),
                    newBlock.getHeight(),
                    isCoinBase,
                    out.getScriptBytes());
            blockStore.addUnspentTransactionOutput(newOut);
            txOutsCreated.add(newOut);
          }
          // All values were already checked for being non-negative (as it is verified in
          // Transaction.verify())
          // but we check again here just for defence in depth. Transactions with zero output value
          // are OK.
          if (valueOut.signum() < 0 || valueOut.compareTo(NetworkParameters.MAX_MONEY) > 0)
            throw new VerificationException("Transaction output value out of range");
          if (isCoinBase) {
            coinbaseValue = valueOut;
          } else {
            if (valueIn.compareTo(valueOut) < 0
                || valueIn.compareTo(NetworkParameters.MAX_MONEY) > 0)
              throw new VerificationException("Transaction input value out of range");
            totalFees = totalFees.add(valueIn.subtract(valueOut));
          }

          if (!isCoinBase) {
            // Because correctlySpends modifies transactions, this must come after we are done with
            // tx
            FutureTask<VerificationException> future =
                new FutureTask<VerificationException>(
                    new Verifier(tx, prevOutScripts, enforcePayToScriptHash));
            scriptVerificationExecutor.execute(future);
            listScriptVerificationResults.add(future);
          }
        }
        if (totalFees.compareTo(NetworkParameters.MAX_MONEY) > 0
            || newBlock
                    .getHeader()
                    .getBlockInflation(newBlock.getHeight())
                    .add(totalFees)
                    .compareTo(coinbaseValue)
                < 0) throw new VerificationException("Transaction fees out of range");
        txOutChanges = new TransactionOutputChanges(txOutsCreated, txOutsSpent);
        for (Future<VerificationException> future : listScriptVerificationResults) {
          VerificationException e;
          try {
            e = future.get();
          } catch (InterruptedException thrownE) {
            throw new RuntimeException(thrownE); // Shouldn't happen
          } catch (ExecutionException thrownE) {
            log.error("Script.correctlySpends threw a non-normal exception: " + thrownE.getCause());
            throw new VerificationException(
                "Bug in Script.correctlySpends, likely script malformed in some new and interesting way.",
                thrownE);
          }
          if (e != null) throw e;
        }
      } else {
        txOutChanges = block.getTxOutChanges();
        if (!params.isCheckpoint(newBlock.getHeight()))
          for (StoredTransactionOutput out : txOutChanges.txOutsCreated) {
            Sha256Hash hash = out.getHash();
            if (blockStore.getTransactionOutput(hash, out.getIndex()) != null)
              throw new VerificationException("Block failed BIP30 test!");
          }
        for (StoredTransactionOutput out : txOutChanges.txOutsCreated)
          blockStore.addUnspentTransactionOutput(out);
        for (StoredTransactionOutput out : txOutChanges.txOutsSpent)
          blockStore.removeUnspentTransactionOutput(out);
      }
    } catch (VerificationException e) {
      scriptVerificationExecutor.shutdownNow();
      blockStore.abortDatabaseBatchWrite();
      throw e;
    } catch (BlockStoreException e) {
      scriptVerificationExecutor.shutdownNow();
      blockStore.abortDatabaseBatchWrite();
      throw e;
    }
    return txOutChanges;
  }
  @Override
  protected TransactionOutputChanges connectTransactions(int height, Block block)
      throws VerificationException, BlockStoreException {
    checkState(lock.isHeldByCurrentThread());
    if (block.transactions == null)
      throw new RuntimeException(
          "connectTransactions called with Block that didn't have transactions!");
    if (!params.passesCheckpoint(height, block.getHash()))
      throw new VerificationException("Block failed checkpoint lockin at " + height);

    blockStore.beginDatabaseBatchWrite();

    LinkedList<StoredTransactionOutput> txOutsSpent = new LinkedList<StoredTransactionOutput>();
    LinkedList<StoredTransactionOutput> txOutsCreated = new LinkedList<StoredTransactionOutput>();
    long sigOps = 0;
    final boolean enforcePayToScriptHash =
        block.getTimeSeconds() >= NetworkParameters.BIP16_ENFORCE_TIME;

    if (scriptVerificationExecutor.isShutdown())
      scriptVerificationExecutor =
          Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    List<Future<VerificationException>> listScriptVerificationResults =
        new ArrayList<Future<VerificationException>>(block.transactions.size());
    try {
      if (!params.isCheckpoint(height)) {
        // BIP30 violator blocks are ones that contain a duplicated transaction. They are all in the
        // checkpoints list and we therefore only check non-checkpoints for duplicated transactions
        // here. See the
        // BIP30 document for more details on this:
        // https://github.com/bitcoin/bips/blob/master/bip-0030.mediawiki
        for (Transaction tx : block.transactions) {
          Sha256Hash hash = tx.getHash();
          // If we already have unspent outputs for this hash, we saw the tx already. Either the
          // block is
          // being added twice (bug) or the block is a BIP30 violator.
          if (blockStore.hasUnspentOutputs(hash, tx.getOutputs().size()))
            throw new VerificationException("Block failed BIP30 test!");
          if (enforcePayToScriptHash) // We already check non-BIP16 sigops in
            // Block.verifyTransactions(true)
            sigOps += tx.getSigOpCount();
        }
      }
      Coin totalFees = Coin.ZERO;
      Coin coinbaseValue = null;
      for (final Transaction tx : block.transactions) {
        boolean isCoinBase = tx.isCoinBase();
        Coin valueIn = Coin.ZERO;
        Coin valueOut = Coin.ZERO;
        final List<Script> prevOutScripts = new LinkedList<Script>();
        if (!isCoinBase) {
          // For each input of the transaction remove the corresponding output from the set of
          // unspent
          // outputs.
          for (int index = 0; index < tx.getInputs().size(); index++) {
            TransactionInput in = tx.getInputs().get(index);
            StoredTransactionOutput prevOut =
                blockStore.getTransactionOutput(
                    in.getOutpoint().getHash(), in.getOutpoint().getIndex());
            if (prevOut == null)
              throw new VerificationException(
                  "Attempted to spend a non-existent or already spent output!");
            // Coinbases can't be spent until they mature, to avoid re-orgs destroying entire
            // transaction
            // chains. The assumption is there will ~never be re-orgs deeper than the spendable
            // coinbase
            // chain depth.
            if (height - prevOut.getHeight() < params.getSpendableCoinbaseDepth())
              throw new VerificationException(
                  "Tried to spend coinbase at depth " + (height - prevOut.getHeight()));
            // TODO: Check we're not spending the genesis transaction here. Satoshis code won't
            // allow it.
            valueIn = valueIn.add(prevOut.getValue());
            if (enforcePayToScriptHash) {
              if (new Script(prevOut.getScriptBytes()).isPayToScriptHash())
                sigOps += Script.getP2SHSigOpCount(in.getScriptBytes());
              if (sigOps > Block.MAX_BLOCK_SIGOPS)
                throw new VerificationException("Too many P2SH SigOps in block");
            }

            prevOutScripts.add(new Script(prevOut.getScriptBytes()));

            // in.getScriptSig().correctlySpends(tx, index, new Script(params,
            // prevOut.getScriptBytes(), 0, prevOut.getScriptBytes().length));

            blockStore.removeUnspentTransactionOutput(prevOut);
            txOutsSpent.add(prevOut);
          }
        }
        Sha256Hash hash = tx.getHash();
        for (TransactionOutput out : tx.getOutputs()) {
          valueOut = valueOut.add(out.getValue());
          // For each output, add it to the set of unspent outputs so it can be consumed in future.
          StoredTransactionOutput newOut =
              new StoredTransactionOutput(
                  hash, out.getIndex(), out.getValue(), height, isCoinBase, out.getScriptBytes());
          blockStore.addUnspentTransactionOutput(newOut);
          txOutsCreated.add(newOut);
        }
        // All values were already checked for being non-negative (as it is verified in
        // Transaction.verify())
        // but we check again here just for defence in depth. Transactions with zero output value
        // are OK.
        if (valueOut.signum() < 0 || valueOut.compareTo(NetworkParameters.MAX_MONEY) > 0)
          throw new VerificationException("Transaction output value out of range");
        if (isCoinBase) {
          coinbaseValue = valueOut;
        } else {
          if (valueIn.compareTo(valueOut) < 0 || valueIn.compareTo(NetworkParameters.MAX_MONEY) > 0)
            throw new VerificationException("Transaction input value out of range");
          totalFees = totalFees.add(valueIn.subtract(valueOut));
        }

        if (!isCoinBase && runScripts) {
          // Because correctlySpends modifies transactions, this must come after we are done with tx
          FutureTask<VerificationException> future =
              new FutureTask<VerificationException>(
                  new Verifier(tx, prevOutScripts, enforcePayToScriptHash));
          scriptVerificationExecutor.execute(future);
          listScriptVerificationResults.add(future);
        }
      }
      if (totalFees.compareTo(NetworkParameters.MAX_MONEY) > 0
          || block.getBlockInflation(height).add(totalFees).compareTo(coinbaseValue) < 0)
        throw new VerificationException("Transaction fees out of range");
      for (Future<VerificationException> future : listScriptVerificationResults) {
        VerificationException e;
        try {
          e = future.get();
        } catch (InterruptedException thrownE) {
          throw new RuntimeException(thrownE); // Shouldn't happen
        } catch (ExecutionException thrownE) {
          log.error("Script.correctlySpends threw a non-normal exception: " + thrownE.getCause());
          throw new VerificationException(
              "Bug in Script.correctlySpends, likely script malformed in some new and interesting way.",
              thrownE);
        }
        if (e != null) throw e;
      }
    } catch (VerificationException e) {
      scriptVerificationExecutor.shutdownNow();
      blockStore.abortDatabaseBatchWrite();
      throw e;
    } catch (BlockStoreException e) {
      scriptVerificationExecutor.shutdownNow();
      blockStore.abortDatabaseBatchWrite();
      throw e;
    }
    return new TransactionOutputChanges(txOutsCreated, txOutsSpent);
  }