/// <inheritdoc />
public HdAccount CreateNewAccount(Wallet wallet, CoinType coinType, string password)
{
// get the accounts for this type of coin
var accounts = wallet.AccountsRoot.Single(a => a.CoinType == coinType).Accounts.ToList();
int newAccountIndex = 0;
if (accounts.Any())
{
newAccountIndex = accounts.Max(a => a.Index) + 1;
}
// get the extended pub key used to generate addresses for this account
var privateKey = Key.Parse(wallet.EncryptedSeed, password, wallet.Network);
var seedExtKey = new ExtKey(privateKey, wallet.ChainCode);
var accountHdPath = $"m/44'/{(int)coinType}'/{newAccountIndex}'";
KeyPath keyPath = new KeyPath(accountHdPath);
ExtKey accountExtKey = seedExtKey.Derive(keyPath);
ExtPubKey accountExtPubKey = accountExtKey.Neuter();
var newAccount = new HdAccount
{
Index = newAccountIndex,
ExtendedPubKey = accountExtPubKey.ToString(wallet.Network),
ExternalAddresses = new List <HdAddress>(),
InternalAddresses = new List <HdAddress>(),
Name = $"account {newAccountIndex}",
HdPath = accountHdPath,
CreationTime = DateTimeOffset.Now
};
accounts.Add(newAccount);
wallet.AccountsRoot.Single(a => a.CoinType == coinType).Accounts = accounts;
return(newAccount);
}
/// <inheritdoc />
public Mnemonic CreateWallet(string password, string folderPath, string name, string network, string passphrase = null)
{
// for now the passphrase is set to be the password by default.
if (passphrase == null)
{
passphrase = password;
}
// generate the root seed used to generate keys from a mnemonic picked at random
// and a passphrase optionally provided by the user
Mnemonic mnemonic = new Mnemonic(Wordlist.English, WordCount.Twelve);
ExtKey extendedKey = mnemonic.DeriveExtKey(passphrase);
Network coinNetwork = WalletHelpers.GetNetwork(network);
// create a wallet file
Wallet wallet = this.GenerateWalletFile(password, folderPath, name, coinNetwork, extendedKey);
// generate multiple accounts and addresses from the get-go
for (int i = 0; i < WalletCreationAccountsCount; i++)
{
HdAccount account = CreateNewAccount(wallet, this.coinType, password);
this.CreateAddressesInAccount(account, coinNetwork, UnusedAddressesBuffer);
this.CreateAddressesInAccount(account, coinNetwork, UnusedAddressesBuffer, true);
}
// update the height of the we start syncing from
this.UpdateLastBlockSyncedHeight(wallet, this.chain.Tip.Height);
// save the changes to the file and add addresses to be tracked
this.SaveToFile(wallet);
this.Load(wallet);
this.LoadKeysLookup();
return(mnemonic);
}
/// <inheritdoc />
public (string hex, uint256 transactionId, Money fee) BuildTransaction(string walletName, string accountName, string password, string destinationAddress, Money amount, string feeType, int minConfirmations)
{
if (amount == Money.Zero)
{
throw new WalletException($"Cannot send transaction with 0 {this.coinType}");
}
// get the wallet and the account
Wallet wallet = this.GetWalletByName(walletName);
HdAccount account = wallet.AccountsRoot.Single(a => a.CoinType == this.coinType).GetAccountByName(accountName);
// get a list of transactions outputs that have not been spent
var spendableTransactions = account.GetSpendableTransactions().ToList();
// remove whats under min confirmations
var currentHeight = this.chain.Height;
spendableTransactions = spendableTransactions.Where(s => currentHeight - s.BlockHeight >= minConfirmations).ToList();
// get total spendable balance in the account.
var balance = spendableTransactions.Sum(t => t.Amount);
// make sure we have enough funds
if (balance < amount)
{
throw new WalletException("Not enough funds.");
}
// calculate which addresses needs to be used as well as the fee to be charged
var calculationResult = this.CalculateFees(spendableTransactions, amount);
// get extended private key
var privateKey = Key.Parse(wallet.EncryptedSeed, password, wallet.Network);
var seedExtKey = new ExtKey(privateKey, wallet.ChainCode);
var signingKeys = new HashSet <ISecret>();
var coins = new List <Coin>();
foreach (var transactionToUse in calculationResult.transactionsToUse)
{
var address = account.FindAddressesForTransaction(t => t.Id == transactionToUse.Id && t.Index == transactionToUse.Index && t.Amount > 0).Single();
ExtKey addressExtKey = seedExtKey.Derive(new KeyPath(address.HdPath));
BitcoinExtKey addressPrivateKey = addressExtKey.GetWif(wallet.Network);
signingKeys.Add(addressPrivateKey);
coins.Add(new Coin(transactionToUse.Id, (uint)transactionToUse.Index, transactionToUse.Amount, transactionToUse.ScriptPubKey));
}
// get address to send the change to
var changeAddress = account.GetFirstUnusedChangeAddress();
// get script destination address
Script destinationScript = PayToPubkeyHashTemplate.Instance.GenerateScriptPubKey(new BitcoinPubKeyAddress(destinationAddress, wallet.Network));
// build transaction
var builder = new TransactionBuilder();
Transaction tx = builder
.AddCoins(coins)
.AddKeys(signingKeys.ToArray())
.Send(destinationScript, amount)
.SetChange(changeAddress.ScriptPubKey)
.SendFees(calculationResult.fee)
.BuildTransaction(true);
if (!builder.Verify(tx))
{
throw new WalletException("Could not build transaction, please make sure you entered the correct data.");
}
return(tx.ToHex(), tx.GetHash(), calculationResult.fee);
}
