Receipt format and independent reader.

The frozen v1 format and additive v2 fallback-authority format can be checked without a Timevolt account. This is a static reference, not a public receipt-creation API.

• v1 schema · v1 specification · v1 format checksums
• v2 schema · v2 specification · v2 format checksums
• Download the self-contained reader
• Apache License 2.0 · Bundled library notices

Offline checking verifies the saved evidence. Current chain membership needs an optional direct check to a source you choose. Keep the complete receipt and the exact original separately.