Extension Systems • Estimated 35m

Proof of Existence and Timestamping

extension.proof-of-existence

Proof-of-existence protocols commit evidence to Bitcoin so anyone can later verify that a document or statement existed no later than a particular time, without storing the entire document on-chain.

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Curated resources (3)

• Mastering Bitcoin (book) Background for hashes, commitments, transactions, and Bitcoin data anchoring.
• OpenTimestamps (article) Open protocol and implementation for decentralized timestamp proofs.
• Bitcoin Genesis Block (article) Historical example of a time-bound message embedded in Bitcoin's launch block.

Direct prerequisites (1)

• Commitment Schemes

Direct dependents (0)

• None

Canonical site description: Interactive Bitcoin knowledge graph with prerequisites, curated resources, and structured topic pages.