doc.id logodoc.id

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doc.id turns files into verifiable evidence: hashed, timestamped, and human-readable.

Proof of existence

We compute a SHA-256 fingerprint of your file and record it with independent anchors.

How proof works

Co-signing

Invite others to attest — “existence” or “content” — without exposing private data.

Use cases

Permanence

OpenTimestamps (Bitcoin), web archives, and IPFS give your proof longevity.

Explore public proofs