分层确定性钱包(HD)

用golang开发比特币钱包必备。先写一下使用，后面会进行充分补充

package main

import (
    "fmt"

    "github.com/bcext/cashutil/hdkeychain"
    "github.com/bcext/gcash/chaincfg"
)

func main() {
    seed, err := hdkeychain.GenerateSeed(hdkeychain.RecommendedSeedLen)
    if err != nil {
        panic(err)
    }

    key, err := hdkeychain.NewMaster(seed, &chaincfg.TestNet3Params)
    if err != nil {
        panic(err)
    }

    keyStr := key.String()
    // output: tprv8ZgxMBicQKsPdFH9KwqSxs4mhxxKQ1fhAXvTHsTrztRzn4MF42ySDtS1AkTciqWY6FRfQy8pnBrrmJ1CbcQXZ7iaiWiXiM8W24K3KabEYtY
    fmt.Println(keyStr)

    generatedKey, err := hdkeychain.NewKeyFromString(keyStr)
    if err != nil {
        panic(err)
    }

    child0, err := generatedKey.Child(hdkeychain.HardenedKeyStart + 0)
    if err != nil {
        panic(err)
    }

    child0Address, err := child0.Address(&chaincfg.TestNet3Params)
    if err != nil {
        panic(err)
    }

    fmt.Println("child0 address:", child0Address.EncodeAddress(true))

    child00Extend, err := child0.Child(0)
    if err != nil {
        panic(err)
    }
    child00ExtendAddress, err := child00Extend.Address(&chaincfg.TestNet3Params)
    if err != nil {
        panic(err)
    }
    fmt.Println("child0's extended address:", child00ExtendAddress.EncodeAddress(true))

    child01Internal, err := child0.Child(1)
    if err != nil {
        panic(err)
    }
    // 可以使用主网编码地址
    child01InternalAddress, err := child01Internal.Address(&chaincfg.MainNetParams)
    if err != nil {
        panic(err)
    }
    fmt.Println("child0's internal address:", child01InternalAddress.EncodeAddress(true))

    fmt.Println("child00Extended is privkey?", child00Extend.IsPrivate())
    fmt.Println("child01Internal is privkey?", child01Internal.IsPrivate())

    extenedKey, err := child01Internal.Neuter()
    if err != nil {
        panic(err)
    }
    fmt.Println("extendedKey string:", extenedKey.String())
}