六科なじむ (CV: 日高里菜) & 割戸真友 (CV: 金元寿子) & 軽井沢ユキ (CV: 上坂すみれ) & 出稼ぎガルシア (CV: 金子彩花)
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 0x014f45a806ce7d666fde30535f1ede4f33810f0b164496a36b2c4c9950346900. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35832977-94c4-4b09-a16d-9cae158fa300.json and https://artists.proofprofile.net/proofs/artist/35832977-94c4-4b09-a16d-9cae158fa300.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).