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 0x3e8baafa6a40044d967eb15702ba324cf080f6b08355cf3935271009bfc21f7d. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/503c5bed-4535-4ce4-ae30-b8f0945a16c7.json and https://artists.proofprofile.net/proofs/artist/503c5bed-4535-4ce4-ae30-b8f0945a16c7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Piano Concertos Nos. 1, 2, 3 and 4
Beethoven: Chamber Music for Horns, Winds and Strings
Brahms / Duvernoy / Herzogenberg: Horn Trios
Concerto for Violin, Cello & Piano in C Major, Op. 56 "Triple Concerto": II. Largo
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xc8926b51d0cf315db3682c7de9f39465533cb41cd6f9d5d7fbcf87eaf2b1d3a2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199803305.
Heroic Horn: Best Loved Classical Horn Music
Ravel: Piano Concerto in G Major / Piano Concerto for the Left Hand / Introduction Et Allegro
Mozart: Flute Concertos Nos. 1 and 2 / Andante in C Major
Bach, J.S.: Prelude and Fugue in G Major / Toccata and Fugue in D Minor / Handel: Organ Concerto