Cold wallet address generator

cold.go

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strconv"

	"github.com/NebulousLabs/Sia/crypto"
	"github.com/NebulousLabs/Sia/modules"
	"github.com/NebulousLabs/Sia/types"
	"github.com/NebulousLabs/entropy-mnemonics"
)

func main() {
	log.SetFlags(0)
	if len(os.Args) != 2 {
		log.Fatal("Usage: cold index")
	}
	n, err := strconv.Atoi(os.Args[1])
	if err != nil {
		log.Fatal("expected number, got", os.Args[1])
	}

	os.Stdout.WriteString("Seed: ")
	s := bufio.NewScanner(os.Stdin)
	s.Scan()
	seed, err := modules.StringToSeed(s.Text(), mnemonics.English)
	if err != nil {
		log.Fatal(err)
	}

	_, pk := crypto.GenerateKeyPairDeterministic(crypto.HashAll(seed, uint64(n)))
	fmt.Println(types.UnlockConditions{
		PublicKeys:         []types.SiaPublicKey{types.Ed25519PublicKey(pk)},
		SignaturesRequired: 1,
	}.UnlockHash())
}