麻帆良学園中等部2-A(相坂さよ、明石裕奈、朝倉和美、綾瀬夕映、和泉亜子、大河内アキラ)
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d0b9fd9bf81db7ec810edf373aa3bfe5d115617e8417cf44d20a802f8aa90ee. Chain 2 (Bitcoin): anchored in block 953999 (2026-06-16T20:20:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/31eab740-64fc-4e7b-aaba-263f6bb76037.json and https://artists.proofprofile.net/proofs/artist/31eab740-64fc-4e7b-aaba-263f6bb76037.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).