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 0x4e02f40aba56766a9d57fbbefe86077ac38ea6b761569e9560bb91b1fd6902e9. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a7b2db0-258c-4843-9c55-b88e6ccb7c22.json and https://artists.proofprofile.net/proofs/artist/6a7b2db0-258c-4843-9c55-b88e6ccb7c22.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
☆SHOW TIME 4☆空閑 愁&虎石和泉/｢スタミュ｣ミュージカルソングシリーズ
☆2nd SHOW TIME 7☆ 空閑×虎石×北原&北原×南條/「スタミュ」ミュージカルソングシリーズ