Unverified50% confidenceFactExact time
OpenTimestamps is a Bitcoin timestamping protocol proposed by Peter Todd that submits the SHA-256 hash of data to calendar servers, aggregates them into a Merkle tree, and writes it to the Bitcoin blockchain, providing an extremely low-cost, no-need-to-trust-a-single-server "not later than" proof of existence at a certain point in time.
1
Sources
50%
Confidence
Long-term
Relevance
10/12/2026
First Seen
Sources
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