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 0x7210dd78163a76a7d6876be1a41ecb89c0eb8e35e08307701cbe5b9adf40b908. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe5da3e5-7b2d-492c-ad4b-6300e835a93b.json and https://artists.proofprofile.net/proofs/artist/fe5da3e5-7b2d-492c-ad4b-6300e835a93b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Relaxing Bossa Time with the Comfort of New Greenery
まったりとした冬のリラックスタイム
春の息吹とリラックスミュージック
Refresh & Relax in the Midst of New Greenery
春の公園で過ごすリフレッシュジャズ
BGM for Reading Without Losing Track of Time
Refreshing Chillout Melody with Spring Air
Exhilarating Bossa Playlist Invited by the Spring Weather
朝を楽しむためのジャズミュージック
雨の日の読書とリラックスジャズ
心地よい雨と温もりのカフェ音楽