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 sin θ₂ = (1·sin30)/1.5 → θ₂ ≈ 19.47°
optics.snell_law: θ₂ = arcsin((1.0/1.5)·sin(30.0°)) = 19.471° (matches claim 19.471220634490688)
gates
RED:PASS
content hash (the seal)
7e0717dfc554e1bf116bdaff5cf8b954433b90828db989b14638337163818bc8
raw JSON ↗ · re-check: GET /seal?hash=7e0717dfc554e1bf…