---
title: "Signed proof a hash existed by a given moment ($0.02)"
method: GET
path: "/v1/attestation"
---

# Signed proof a hash existed by a given moment ($0.02)

`GET /v1/attestation`

## Request

- Base URL: `https://soren.com`
- URL: `https://soren.com/v1/attestation`
- Auth: none declared

Returns a signed, timestamped statement that a SHA-256 was presented to Soren at a specific moment. You hash your own content and send only the hash — Soren never receives it. Proves existence no later than the timestamp; not authorship, not truth, not legal notarisation.

## Query parameters

- `hash` string, required
- `note` string

## Response `200`

Signed attestation.

- object
  - `attested` boolean
  - `hash` string
  - `observed_at` string, date-time
  - `statement` string
  - `signature` object
  - `what_this_proves` string
  - `what_this_does_not_prove` string[]

## Other responses

- `400`: Missing or malformed hash. Refused before payment.
- `402`: Payment required.

---

[API](https://skmtc.dev/soren/apis/soren-free-games-api.md) · [All operations](https://skmtc.dev/soren/apis/soren-free-games-api/llms.txt) · [OpenAPI document](https://skmtc.dev/soren/apis/soren-free-games-api/revisions/00402cfcf30d?raw)