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 0x9f4b28776f385cd5b89645a71f91f1d8c96a83b737cba9a947469eb2aa62cc24. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0c914cc-824e-4165-906b-38880309c45e.json and https://artists.proofprofile.net/proofs/artist/b0c914cc-824e-4165-906b-38880309c45e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
NHK special drama "Douse shinu nara, Paris de shinou." Original Soundtrack
NHK特集ドラマ 「どうせ死ぬなら、パリで死のう。」 Original Soundtrack