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 0x118b8c1cf750bdd5c7663701b0b90de8333e2f6d12efa2673dc63bf970f5c5db. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1032b324-85b5-400b-bc0d-8a4dc7adbceb.json and https://artists.proofprofile.net/proofs/artist/1032b324-85b5-400b-bc0d-8a4dc7adbceb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sound of KYOTO～すきま～／思いでのおとしもの～シンプリー・ピアノ～
Sound of KYOTO -すきま- /あっぷる・ふらわーず-シンプリーピアノII-