Bitcoin Forum

func CreateTransaction(secret, sender, destination string, amount int64, txHash string) (*wire.MsgTx, error) {

	// convert private key (string) -> ECDSA format
	priv, _ := stringToPrivateECDSA(secret)

	// init new transaction
	// TxVersion = 1
	redeemTx := wire.NewMsgTx(TxVersion)
	// convert sender address (string) -> BTC Address format
	sourceAddress, _ := btcutil.DecodeAddress(sender, ChainParams)
	// create script base on address converted
	sourcePkScript, _ := txscript.PayToAddrScript(sourceAddress)

	// prepare output of sending #btc to destination address
	// convert destination address (string) -> BTC Address format
	// trying pay-to-pubkey method
	destinationAddress, _ := btcutil.DecodeAddress(destination, ChainParams)
	// create script for output address
	destinationPkScript, _ := txscript.PayToAddrScript(destinationAddress)
	// set amount to send to destination
	redeemTxOut := wire.NewTxOut(amount, destinationPkScript)
	redeemTx.AddTxOut(redeemTxOut)

	// prepare output for Tx
	// return #btc changes back to our wallet
	// Total = #btc of that unspent output
	// amount = #btc send to destination
	redeemTxOut = wire.NewTxOut(Total-amount-TxFee, sourcePkScript)
	redeemTx.AddTxOut(redeemTxOut)

	// txHash = previous unspent output of sourceAddress
	sourceUtxoHash, _ := chainhash.NewHashFromStr(txHash)
	prevOut := wire.NewOutPoint(sourceUtxoHash, 0)
	redeemTxIn := wire.NewTxIn(prevOut, nil, nil)
	redeemTx.AddTxIn(redeemTxIn)

	sig, err := txscript.SignatureScript(redeemTx, 0, sourcePkScript, txscript.SigHashAll, priv, false)
	if err != nil {
		fmt.Println(err)
		return nil, err
	}
	redeemTx.TxIn[0].SignatureScript = sig

	return redeemTx, nil
}