Timestamping with OpenTimestamps
summary
OpenTimestamps uses Bitcoin to create trustless timestamps by hashing many file hashes into a Merkle tree and writing only the root onchain, making proofs compact and cheap; experiments also port to Ethereum. A Guardian Project app captures image metadata (JSON with PNG signature), timestamps it with OpenTimestamps, and produces verifiable proofs that have been used as evidence; precision is coarse at ~3‑hour precision. A quick clone of a competing service is built in hours and functions.
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chapters (7)
- 0:00What is timestamping
- 2:14Why use the blockchain
- 5:11What is OpenTimestamps
- 8:30OpenTimestamps in practice
- 10:15Proof mode for media
- 12:32Legal validity and precision
- 15:33Q&A
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