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 0xffc951f36fd6df1fd781b2c9baa55d1469feef4d0f7b431a01e8183fb3602883. Chain 2 (Bitcoin): anchored in block 954615 (2026-06-20T22:44:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4cf08d8-3eca-4004-a62b-c9d2655fcc84.json and https://artists.proofprofile.net/proofs/artist/c4cf08d8-3eca-4004-a62b-c9d2655fcc84.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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愛犬が冬を快適にすごせるために
Binaural Rain Magic: Baby's Peaceful Dreams Ballad
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Gentle Paws: Chill Music for Pet Relaxation
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