The receipt
✓ HOLDS
A permanent, tamper-evident record of a verification. The content hash IS the proof — re-fetch it and the bytes must match, or it is not this record.
Worked trail
CONFIRMED V = 5·4·0.1 = 2 m³
construction.concrete_volume: V = 2.0000 m³ (matches claim)
gates
RED:PASS
content hash (the seal)
dc87ca239d9e5fb20586bd0dac22112630139f9f816a2c8956e5298ecefb3473
raw JSON ↗ · re-check: GET /seal?hash=dc87ca239d9e5fb2…