thumb|Zoltán Kocsis in 1972 200px Zoltán Kocsis (; 30 May 1952 – 6 November 2016) was a Hungarian pianist, conductor and composer. Biography Studies Born in Budapest, he began his musical studies a
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 0x5c365480589364e75960df4e898578919d690e0565e726b18563f4ea3125c1d2. 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/2faa1ae8-dab4-4793-8845-355ceb97273d.json and https://artists.proofprofile.net/proofs/artist/2faa1ae8-dab4-4793-8845-355ceb97273d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Debussy: Images Books 1 & 2/Arabesques/Rêverie etc.
Deux Arabesques L. 66: No. 1 Andante con moto
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 0xcffb71ca2b7d3d0ef95eae3e7064f9c9c140c00da9260a5b17a57633e0de0f32. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA508804509 — a six-check JSON result.
Beethoven: Clarinet Trio / Brahms: Clarinet Trio
Bach: Keyboard Concertos, Bwv 1052, Bwv 1053, Bwv 1060 and Bwv 1061
Piano Concerto No. 1 in D Minor, BWV 1052: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdced1a0853fc3ea0fb291018b50a4907ac068adf8b2f13636cb43f832831c148. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA251292601 — a six-check JSON result.
Classical Music for Learning: Great Masterpieces to Improve Studying and Mental Focus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ab0cc178b0d1ab2c4b34538df1c811cbc3041e09038e9ddebb1bf62a98ce67. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US5541301591 — a six-check JSON result.