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What is OpenTimestamps?

OpenTimestamps is an open, free standard for timestamping data in the Bitcoin blockchain. Many fingerprints are combined into a single Merkle root, the root is committed to a Bitcoin transaction, and each fingerprint gets a small proof file linking it to that block. Anyone can verify the proof against Bitcoin without trusting whoever made it.

How it works

  1. A fingerprint (SHA-256) of the data is submitted, never the data itself.
  2. Calendar servers aggregate fingerprints and commit the root to Bitcoin.
  3. Once the block is confirmed, the proof shows the data existed before that block's time.
  4. sebbi.pro's Forever Proof bundles the Merkle path and the OpenTimestamps proof in one file.
Forever Proof standardTimestamp a file

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