TzStamp

Stamp and Verify

To create a timestamp, choose a file to calculate its SHA-256 hash locally in your browser. Alternatively, hash the file yourself and paste the hexadecimal representation into the corresponding field. The stamp button will send the hash to the api.tzstamp.io aggregator server, which will include your file hash in its next publication. Your browser will be prompted to download a partial timestamp proof file. Once published to the blockchain, your timestamp proof will become verifiable.

To verify a timestamp, choose a file (or enter its hash) and a corresponding timestamp proof. The verify button will contact the mainnet.tezos.ecadinfra.com public Tezos node to verify the proof and display the timestamp. If the timestamp proof is partial, your browser will be prompted to download a full proof.

The aggregator root is published every five minutes.

Since 2023/01/18, we've been using the contract: KT1AtaeG5PhuFyyivbfPZRUBkVMiqyxpo2cH

Before, we used to use: KT1NU6erpSTBphHi9fJ9SxuT2a6eTouoWSLj

Aggregator API

Public aggregator base URL

https://api.tzstamp.io

You can run your own aggregator server and use our management utility to deploy your own contract to any Tezos network.

Submit a hash for timestamping

POST /stamp

Submits a hash to be aggregated.

The Content-Type header must be one of application/json or application/x-www-form-urlencoded.

The payload must have a data field containing a hexadecimal representation of a SHA-256 hash.

JSON: { "data": "01234..." }
URLEncoded: data=01234...

The server will respond with a URL at which the proof will be published and seconds until next publication, not including time to on-chain inclusion and confirmation. The response will be plain text by default, but a JSON object can be requested with an Accept header with value application/json:

{ "url": "https://api.tzstamp.io/proof/01234...", "secondsToPublication": "1000" }

Example

$ curl https://api.tzstamp.io/stamp -d data=40cb6ac0645f648a12d0aab7df480796fc4165609a65ea430018d9b3af68b76d

Download a timestamp proof

GET /proof/:id

Retrieves a proof by ID from the server.

The server will respond with the one of the following:

200 OK — The proof is included in the body, encoded in JSON.
202 Accepted — The timestamp proof is pending publication and confirmation.
404 Not Found — The proof either does not exist or has been deleted from the server cache.

Example

$ curl https://api.tzstamp.io/proof/80eb84095823ec33a1d00dadf844028082f384b760f189b7ccc442f7b5b63969 -o myfile.proof.json

Get the server status

GET /status

Fetches the current status of the server. Includes the following information:

The proof format version
The Tezos network identifier
The publication contract address
Seconds until next publication (not including time to inclusion and confirmation on-chain)

The response will be plain text by default, but a JSON object can be requested with an Accept header with value application/json:

{ "proofVersion": 1, "network": "NetXdQprcVkpaWU", "contract": "KT1AtaeG5PhuFyyivbfPZRUBkVMiqyxpo2cH", "secondsToPublication": "1000" }