---
title: "Begin renewal proof-of-possession — receive a single-use nonce to sign"
method: POST
path: "/v1/license/challenge"
tags: ["license"]
---

# Begin renewal proof-of-possession — receive a single-use nonce to sign

`POST /v1/license/challenge`

## Request

- Base URL: `https://api.algenta.ai`
- URL: `https://api.algenta.ai/v1/license/challenge`
- Auth: one of:
  - HTTP bearer
  - API key in header `X-API-Key`

## Request body

- ChallengeRequest
  - `device_id` string, required

## Response `200`

Successful Response

- ChallengeResponse
  - `nonce` string, required
  - `device_pubkey_thumbprint` string, required
  - `expires_in` integer

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/codna/apis/algenta-api.md) · [All operations](https://skmtc.dev/codna/apis/algenta-api/llms.txt) · [OpenAPI document](https://skmtc.dev/codna/apis/algenta-api/revisions/35d30f84a5df?raw)