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 0x9e834782021d08f43fce18ed4e91850384810b4fcd4d3c3bb62c6d219a066f72. Chain 2 (Bitcoin): anchored in block 954008 (2026-06-16T21:31:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3257d068-ad86-4ecd-94e3-4903f3371f68.json and https://artists.proofprofile.net/proofs/artist/3257d068-ad86-4ecd-94e3-4903f3371f68.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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Yellow Edition - Mozart: Piano Concerto No. 27, K. 595 & Serenade No. 4, K. 203
Orange Edition - Mozart: Piano Concerto No. 27, K. 595 & Symphony No. 18, K. 130
Red Edition - Mozart: Piano Concerto No. 27, K. 595 & Symphony No. 25, K. 183
Blue Edition - Mozart: Piano Concertos Nos. 27 & 9 "Jeunehomme"
Green Edition - Mozart: Piano Concerto No. 27, K. 595
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Yellow Edition - Mozart: "A Little Night Music", K. 525 & Piano Concerto No. 27, K. 595
Green Edition - Mozart: "Salzburg Symphony No. 1", K. 136
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Grey Edition - Mozart: Piano Concerto No. 27, K. 595 & Piano Concerto No. 23, K. 488
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Grey Edition - Mozart: Symphony No. 21, K. 134 & Piano Concerto No. 27, K. 595
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Orange Edition - Mozart: Piano Concerto No. 27, K. 595 & German Dances