Free browser tool · no upload
Check the packet, not a promise.
YY Evidence Verifier recomputes every SHA-256 digest in a supported evidence packet and shows exactly what matches, changed, vanished, or appeared. The files never leave your browser.
- Select
- Hash locally
- Compare
- Inspect
Verify a packet
Local file check
Select the complete packet
Choose manifest.sha256 and every file beside it, or drag them here together. Files stay in this browser tab.
Supported now
Two real packet contracts
The verifier checks canonical manifest.sha256 packets. It does not yet claim to reproduce yy-corpus-evidence's different manifest-identity and live-tree verification contract.
YY Workload Receipt
manifest.sha256 · summary.json · report.mdYY Dataset Preflight
manifest.sha256 · report.json · report.html
Integrity boundary
A matching hash is evidence of bytes, not authority
A verified result means the selected files match the unkeyed SHA-256 values in the selected manifest and the packet contains no missing or extra files. It does not prove who created the packet, when it was created, or whether its claims are correct.
Verification happens in memory with the browser's Web Crypto API. YY receives no file names, contents, hashes, or results. Closing or clearing the page discards the selected packet.