static fromString(public_key, address_prefix = config.get('address_prefix')) {
        try {
            return PublicKey.fromStringOrThrow(public_key, address_prefix)
        } catch (e) {
            return null;
        }
    }
@arg {string} public_key - like STMXyz...
        @arg {string} address_prefix - like STM
        @return PublicKey or `null` (if the public_key string is invalid)
        @deprecated fromPublicKeyString (use fromString instead)