Anchor a file. Standard or Sealed.
Two browser-form flows over the same chain. Pick the mode below, drop a file in, get a tamper-evident receipt that an outside auditor can verify without us — against any public block explorer, in any browser.
Standard Proof or Sealed Proof.
Same chain, same verifier. They differ in what someone watching the public chain can learn about your file.
One question decides it: if a stranger noticed your on-chain transaction, would it matter that anyone holding the same file could confirm a receipt exists for it?
Standard Proof
Use when the file is public now, or will be revealed later: released artifacts, public policy snapshots, signed contracts, code releases, revealed bids.
Create a Standard Proof →Sealed Proof
Use when even confirming a matching file would be sensitive: unrevealed bids, internal policy snapshots, private evidence manifests, legal exhibits, pre-release materials.
Create a Sealed Proof →Format-aware fingerprints.
Selective disclosure works for ordinary documents the same way manifest receipts do for agent batches — prove a single page, row, tile, or archive entry without revealing the rest.
| File | Content fingerprint | Section breakdown |
|---|---|---|
| extracted text, normalized | per page | |
| JSON | RFC 8785 canonical | per top-level key |
| CSV | RFC 4180 normalized | per data row |
| Source / text | NFC-normalized, line-ending stable | per line |
| ZIP / DOCX / XLSX | entry manifest | per contained file |
| Image (JPG/PNG/WebP) | raw pixel data, metadata stripped | per tile |
| Anything else | byte-exact hash only | n/a |
Why this matters. A re-saved PDF, a re-compressed JPEG with metadata stripped, or a CSV re-exported with different line endings still verify against the content hash — even though the byte-exact hash changes.
Real receipts — one per format.
Each card opens the live receipt page for a sample file we anchored. Bundles are public; the verifier has a one-click demo for both the Standard and Sealed flows. Click through to see the shape of the receipt you’ll get when you anchor your own.