---
title: "Download the OpenTimestamps proof for a sealed list"
method: GET
path: "/list/{hash}/ots"
tags: ["Verification"]
---

# Download the OpenTimestamps proof for a sealed list

`GET /list/{hash}/ots`

Verify with `ots verify` against the list file. Calendar attestations upgrade to Bitcoin block anchors within ~24 h of sealing.

## Path parameters

- `hash` string, required

## Response `200`

Binary `.ots` proof.

## Other responses

- `404` — No OTS proof for this hash.

---

[API](https://skmtc.net/proofdraw/apis/proofdraw-api.md) · [All operations](https://skmtc.net/proofdraw/apis/proofdraw-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/proofdraw/proofdraw-api/revisions/5d4ce7cb355d/schema)