{"copyright_id":"0x5996dfbc851d4bc07eb5ddd1af5cf63c481ed8f5d317bb6ecda45bef03b8dddf","name":"Norihito Sumitomo 住友紀人","registered_at":"2026-06-21T12:39:10Z","symbol":"NIM1924656","token_address":"0xb649a282b0d0e413bf561b0bba6f4880d2600d95","type":"artist","uuid":"ef9fbcaf-4e05-49a8-b9ad-1f9bc5b6ea84"}
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 0x5996dfbc851d4bc07eb5ddd1af5cf63c481ed8f5d317bb6ecda45bef03b8dddf. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef9fbcaf-4e05-49a8-b9ad-1f9bc5b6ea84.json and https://artists.proofprofile.net/proofs/artist/ef9fbcaf-4e05-49a8-b9ad-1f9bc5b6ea84.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).