void RefreshWalletUI()
{
//INTERESTING every mnemonic can be derived to its equivalent private key
//Which is used to sign transactions
MnemonicInputField.text = WalletMnemonic.ToString();
PrivateKeyInputField.text = WalletMnemonic.DeriveExtKey().ToString(Network.Main);
AddressText.text = m_address.ToString();
StopAllCoroutines();
//INTERESTING Mobile wallets uses "bitcoin:<address>" as the encoded string in QR images
StartCoroutine(LoadQR("bitcoin:" + m_address.ToString()));
}
IEnumerator SendSat(string recipientAddress, int amountSat, int feeSat)
{
Log("Requesting transaction outputs for address " + m_address.ToString());
SetSendPanelInteractable(false);
//INPUT: money coming from an address
//OUTPUT: money going to an address
//Request all unspent transactions related to this address
//https://live.blockcypher.com/btc/address/<address> shows the same but nicely
WWW wwwTxo = new WWW("https://blockchain.info/unspent?active=" + m_address.ToString() + "");
yield return(wwwTxo);
if (wwwTxo.error != null)
{
Log("Cannot get utxo from \"" + wwwTxo.url + "\"\nError: " + wwwTxo.error);
SetSendPanelInteractable(true);
}
else
{
// {
// "unspent_outputs": [
// {
// "tx_hash": "aed0a61f789e80975425685ef65ba0a0e388db0c001dfd9e548e896fe39c1067",
// "tx_hash_big_endian": "67109ce36f898e549efd1d000cdb88e3a0a05bf65e68255497809e781fa6d0ae",
// "tx_output_n": 0,
// "script": "76a914717ee27eca5ed0bd30fde351a19439ed96bdcb3f88ac",
// "value": 2176,
// "value_hex": "0880",
// "confirmations": 0,
// "tx_index": 461965676
// }
// ]
// }
JSONObject utxos = new JSONObject(wwwTxo.text);
//Get all unspent outputs using my address
List <Coin> unspentCoins = new List <Coin>();
for (int i = 0; i < utxos["unspent_outputs"].Count; i++)
{
string txHash = utxos["unspent_outputs"][i]["tx_hash_big_endian"].str;
uint outputIndex = (uint)utxos["unspent_outputs"][i]["tx_output_n"].n;
int valueUnspent = (int)utxos["unspent_outputs"][i]["value"].n;
Log(valueUnspent + " unspent!");
unspentCoins.Add(new Coin(
new uint256(txHash), //Hash of the transaction this output is comming from
outputIndex, //Index of the transaction output within the transaction
Money.Satoshis(valueUnspent), //Amount of money this output has
m_address.ScriptPubKey)); //Script to solve to spend this output
}
//+info about how to use TransactionBuilder can be found here
//https://csharp.hotexamples.com/examples/NBitcoin/TransactionBuilder/-/php-transactionbuilder-class-examples.html
TransactionBuilder txBuilder = Network.Main.CreateTransactionBuilder();
txBuilder.AddKeys(WalletMnemonic.DeriveExtKey().PrivateKey);
txBuilder.AddCoins(unspentCoins);
txBuilder.Send(BitcoinAddress.Create(recipientAddress, Network.Main), Money.Satoshis(amountSat));
txBuilder.SendFees(Money.Satoshis(feeSat));
txBuilder.SetChange(m_address);
Transaction tx = txBuilder.BuildTransaction(true);
Log(tx.ToHex().ToString());
//Submit raw transaction to a bitcoin node
//In this case we use blockchain.info API
WWWForm form = new WWWForm();
form.AddField("tx", tx.ToHex());
WWW wwwRawTx = new WWW("https://blockchain.info/pushtx", form);
yield return(wwwRawTx);
if (wwwRawTx.error != null)
{
Log("Error submitting raw transaction " + wwwRawTx.error, true);
}
else
{
Log(wwwTxo.text);
Log("Transaction sent!");
yield return(new WaitForSeconds(3f));
Application.OpenURL("https://www.blockchain.com/btc/address/" + m_address);
yield return(StartCoroutine(RefreshBalance()));
}
}
SetSendPanelInteractable(true);
}