神浜コウジ&速水ヒロ&仁科カヅキ(CV.柿原徹也&前野智昭&増田俊樹)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ff11ab8f571f8f9fe84215ff018cbd3d44da4109f851559053a4d5ae7f4bc0. 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/2bf292e5-6fa1-4088-a244-1e444f078471.json and https://artists.proofprofile.net/proofs/artist/2bf292e5-6fa1-4088-a244-1e444f078471.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).