Compile guardian and run the python script on the already migrated genesis

guardian.go

package main

import (
	"encoding/base64"
	"fmt"
	"github.com/tendermint/tendermint/crypto/ed25519"
	"os"
)

func main() {
	in := os.Args[1]
	rawKey, err := base64.StdEncoding.DecodeString(in)
	if err != nil {
		panic(err)
	}

	key := ed25519.PubKeyEd25519{}
	copy(key[:], rawKey)

	fmt.Print(base64.StdEncoding.EncodeToString(key.Bytes()))
}

main.py

import json
import subprocess
import bech32
import base64

f = open("genesis.json")
data = json.load(f)
vals = data["app_state"]["staking"]["validators"]

for val in vals:
    cons = val["consensus_pubkey"]
    valRaw = cons["value"]
    out = subprocess.check_output(['./guardian', valRaw]).decode("utf-8")
    godata = base64.b64decode(out.rstrip())
    print(out)

    bp = bech32.bech32_encode("cosmosvalconspub", bech32.convertbits(godata, 8, 5))
    val["consensus_pubkey"] = bp

data["app_state"]["staking"]["validators"] = vals

f2 = open("newgen.json", mode="w")
json.dump(data, f2)