This library helps you transfer your bitcoins, saving your time from managing UTXOs, inputs, outputs and signatures.

go get github.com/glossd/btc

Generating wallet

package main

import (
	"fmt"
	"github.com/glossd/btc/netchain"
	"github.com/glossd/btc/wallet"
)

func main() {
	privateKey, address := wallet.New(netchain.TestNet)
	fmt.Printf("Private Key: %s\nBitcoin address: %s\n", privateKey, address)
}

If you just started learning about bitcoins and blockchain, you probably don't have any testnet bitcoins, wondering where I can get some. People on bitcoin.stackexchange provided a lot of links.

Sending transaction

First we need to create a transaction then broadcast it to blockchain.

package main

import (
	"fmt"
	"github.com/glossd/btc/netchain"
	"github.com/glossd/btc/txutil"
)

func main() {
	net := netchain.TestNet
	rawTx, err := txutil.Create(txutil.CreateParams{
		PrivateKey: "your-wallet-private-key", // e.g. 932u6Q4xEC9UYRb3rS2BWrSpSPEt5KaU8NNP7EWy7zSkWmfBiGe
		Destination: "address", // e.g. n4kkk9H2jGj7t8LA4vxK4DHM7Lq95VaEXC
		Amount: 500000, // satoshi to send
		Net: net,
		MinerFee: 5000,
	})
	if err != nil {
		panic(err)
	}

	// you can broadcast transaction yourself on any blockchain website.
	// e.g. copy rawTx and paste it to https://live.blockcypher.com/btc-testnet/pushtx/
	txID, err := txutil.Broadcast(rawTx, net)
	if err != nil {
		panic(err)
	}
	fmt.Printf("Transaction ID: %s\n", txID)
	// check out your transaction at https://www.blockchain.com/btc-testnet/tx/{txID}
}

all the code can be found in the 'examples' folder.

For testing purposes I used netchain.TestNet.

Real bitcoin transaction

Refer to examples/create-real-transaction I use it to transfer real bitcoins. Here's my usual configuration.

txutil.CreateParams{
    PrivateKey:  "your-wallet-private-key", // e.g. 932u6Q4xEC9UYRb3rS2BWrSpSPEt5KaU8NNP7EWy7zSkWmfBiGe
    Destination: "address", // e.g. n4kkk9H2jGj7t8LA4vxK4DHM7Lq95VaEXC
    SendAll:     true,
    Net:         netchain.MainNet,
    AutoMinerFee: true, // automatically calculates MinerFee
}

I rely on Blockcypher API to receive up-to-date information on the blockchain. You need to specify your own token with BTC_API_KEY env var. Or you could pass your own txutil.CreateParams.Fetch function to txutil.Create.

---

More options

txutil.CreateParams:

Field	Type	Usage
PrivateKeys	[]string	send your bitcoins from multiple wallets
Destinations	[]txutil.Destination	send your bitcoins to multiple addresses
SendAll	bool	send all your bitcoins from your private key or keys, but it only works if you specified just one destination

For the full list of the transaction parameters look inside txutil.CreateParams.