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 0x3d682ef7da216091672b8bb547894741d3fb59ec0e60bd921b91a413fe0c7205. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f3431a2-4038-4938-957f-c25c6f041abd.json and https://artists.proofprofile.net/proofs/artist/0f3431a2-4038-4938-957f-c25c6f041abd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
J.S.バッハ ヴァイオリン・ソナタ 第１番ロ短調BWV.1014 / 第３番ホ長調BWV.1016 第４番ハ短調BWV.1017 / 第６番ト長調BWV.1019