Independent verification

Verify a record.

Upload a proof bundle to confirm that a record is intact, still fits into its history, and has not been changed since signing. Runs entirely in your browser. No account required.

The proof bundle contains an Ed25519 signature and SHA-256 hash chain. Any standard cryptography library can verify these, DarkMatter does not need to exist for the math to work.

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Drop proof_bundle.json here
Or use the buttons below to browse or try an example
Runs in your browser · no upload · no account · file never leaves your machine
Load a proof bundle to continue

Verify many records at once.

Check a full set of records in one pass and quickly spot any failures. Upload multiple proof bundles to verify them together.

Drop multiple proof bundles here
Or browse files · accepts multiple .json files at once