Module SDK
WebAuthn Validator

Webauthn Validator

The Webauthn Validator is a module that allows you to verify Webauthn signatures (or Passkeys) on an account. The Webauthn Validator module is used to validate transactions and other executions on the account.

You can find the source code for the module in the ModuleKit examples (opens in a new tab) and the deployment address in the address book.


The getWebauthnValidator function is used to create an instance of the Webauthn Validator module. The webAuthnCredential is an object consisting of the string id and a publicKey. This function returns a module object.

type WebauthnCredential = {
  id: string;
  publicKey: [Hex, Hex];

The publicKey is an array of two hex-encoded strings. The first is the x coordinate of the key and the second is the y coordinate of the key. The id is a string that represents the credential id and can be an arbitrary string that is used to identify the credential.

import { getWebauthnValidator } from "@rhinestone/module-sdk";
const webAuthnCredential = {
  id: "credential-id",
  publicKey: ["0x1234...", "0x5678..."],
const webauthnValidator = getWebauthnValidator({


The getWebauthnValidatorMockSignature function is used to get a mock signature for the validator. This is used to calculate the gas of an ERC-4337 UserOperation. This function returns a hex-encoded signature.

import { getWebauthnValidatorMockSignature } from "@rhinestone/module-sdk";
const mockSignature = getWebauthnValidatorMockSignature();


The WEBAUTHN_VALIDATOR_ADDRESS is a constant that represents the module address.