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Welcome

MilliHash creates a timestamped, publicly verifiable record of any digital asset. Submit a file or text — MilliHash records its SHA-256 hash with a precise, third-party-signed timestamp and anchors it to the Bitcoin blockchain.
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It uses a two-layer proof model: an RFC 3161 Trusted Timestamp Authority for millisecond-accurate attestation, then OpenTimestamps for permanent, decentralized immutability on Bitcoin.
 
Verification is public. Anyone with the asset or its hash can check a registration — no account required. Authenticated registration and certificate downloads are available through your subscription.
 
Try it in the app, or call the API directly.

Features

  • Asset Registration — Hash file or text, get a TSA-signed timestamp, and receive a downloadable certificate.

  • Bitcoin Anchoring — Proofs are anchored asynchronously via OpenTimestamps for lasting immutability.

  • Public Verification — Look up any registration by hash or certificate ID without signing in.

  • Version Lineage — Chain related asset versions into a project so evidence builds over time.

  • C2PA Aware — Captures embedded provenance metadata when present; works even when that metadata is stripped later.

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