---
title: "Begin passkey assertion ceremony"
method: POST
path: "/passkeys/assertion/begin"
tags: ["WalletUnitActivation"]
---

# Begin passkey assertion ceremony

`POST /passkeys/assertion/begin`

Creates a WebAuthn assertion challenge for login, step-up, or wallet
activation. The browser or wallet application performs
`navigator.credentials.get` at the edge and submits the assertion
response to the finish endpoint.

## Request body

- BeginPasskeyAssertionRequest — unresolved $ref

## Response `201`

WebAuthn assertion options.

- PasskeyCeremonyOptions — unresolved $ref

## Other responses

- `400` — unresolved $ref
- `401` — unresolved $ref
- `403` — unresolved $ref

## Changes

- **2026-07-17** `be46f4806163` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/sphereon-opensource/apis/wallet-unit-api/changes/passkeys/assertion/begin/post.md)

---

[API](https://skmtc.dev/sphereon-opensource/apis/wallet-unit-api.md) · [All operations](https://skmtc.dev/sphereon-opensource/apis/wallet-unit-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/sphereon-opensource/wallet-unit-api/revisions/be46f4806163/schema)