Platform / Verify
LIVECheck a file against the Proof Ledger.
The file is hashed with SHA-256 in your browser and never leaves your device. Only the hash is checked against the ledger.
Drop a file to verify
Your file is hashed with SHA-256 in your browser and never leaves your device. Only the hash is checked against the Proof Ledger.
Browse filesHow to verify independently
Nothing below depends on trusting this website. You need the file, curl, jq and the OpenTimestamps client. The ML-DSA-65 co-signature is in testing and optional to check, against the key in /api/ledger/pubkeys whose key_id matches the entry's pq_key_id.
SHA-256 of the exact bytes you hold. Use sha256sum on Linux.
shasum -a 256 document.pdf