---
title: "Verify a restricted passkey proof"
method: POST
path: "/identity/factor_migrations/passkey_registrations/{challenge}/confirmation"
tags: ["identity", "customer-session", "customer-session-public"]
---

# Verify a restricted passkey proof

`POST /identity/factor_migrations/passkey_registrations/{challenge}/confirmation`

## Request

- Base URL: `https://api.stablesea.com` (the document declares no server; this is the origin it was published from)
- URL: `https://api.stablesea.com/identity/factor_migrations/passkey_registrations/{challenge}/confirmation`
- Auth: none declared

Verifies the migration-bound UV browser response once. A new credential remains purpose-encrypted and inactive until atomic migration completion. No cookie, ordinary session token, retirement or method-change notice is issued by this proof step.

## Path parameters

- `challenge` string, required

## Request body

- IdentityMigrationPasskeyConfirmationInput
  - `browser_error` 'invalid_state' | 'not_allowed'
  - `credential_response` unknown
  - `migration_token` string, required

## Response `200`

OK

- IdentityMigrationProofOutput
  - `verified` boolean

## Other responses

- `400`: Bad Request
- `401`: Unauthorized
- `403`: Forbidden
- `404`: Not Found
- `409`: Conflict
- `429`: Too Many Requests
- `503`: Service Unavailable
- `default`: Error response.

## Changes

- **2026-11-04** `fb17fc318db3`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/stablesea/apis/stable-sea-backend/changes/identity/factor_migrations/passkey_registrations/:challenge/confirmation/post.md)

---

[API](https://skmtc.dev/stablesea/apis/stable-sea-backend.md) - [All operations](https://skmtc.dev/stablesea/apis/stable-sea-backend/llms.txt) - [OpenAPI document](https://skmtc.dev/stablesea/apis/stable-sea-backend/revisions/fb17fc318db3?raw)