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 0xe6d02f647215b04d0379fad241a66e6c4e0d810b0fd967e96f67a30c9ac677aa. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a3718b3d-2aea-4182-a794-bde059b3ed67.json and https://artists.proofprofile.net/proofs/artist/a3718b3d-2aea-4182-a794-bde059b3ed67.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Brandenburg Concerto No. 2 in F Major, BWV 1047: I. Allegro Moderato
Walter Rinaldi: Piano Concertos & String Orchestra Works - Bach: Jesu, Joy of Man's Desiring - Handel: Messiah, Hallelujah Corus - Debussy: Claire De Lune & Children’s Corner - Ravel: Pavane - Mozart: Ave Verum