moduls/back/node_modules/validator/es/lib/isBase58.js

import assertString from './util/assertString'; // Accepted chars - 123456789ABCDEFGH JKLMN PQRSTUVWXYZabcdefghijk mnopqrstuvwxyz

var base58Reg = /^[A-HJ-NP-Za-km-z1-9]*$/;
export default function isBase58(str) {
  assertString(str);

  if (base58Reg.test(str)) {
    return true;
  }

  return false;
}