thumb|alt=black and white photograph of middle-aged man, balding|Leibowitz, c. mid-1960s René Leibowitz (; ; 17 February 1913 – 29 August 1972) was a Polish and French composer, conductor, music theo
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 0x6897c1aaa161a8fa408f8c23bc014e03a765a039f237d77729ab3dfc87aae9ee. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/07ef7467-9715-4b4e-a8a3-9954e58f56f5.json and https://artists.proofprofile.net/proofs/artist/07ef7467-9715-4b4e-a8a3-9954e58f56f5.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Offenbach: La Grande-Duchesse de Gerolstein
Film & Stage Greats 2 - Orchestral Favourites
Offenbach: La Belle Hélène - Chabrier: L'Étoile
Darmstadt Aural Documents, Box 1 - Composers-Conductors
Symphony No. 6 in F Major, Op. 68 "Pastoral": I. Awakening of Cheerful Feelings Upon Arrival in the Country. Allegro ma non troppo
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 0xa05b408b90dc19a0f5e089d90e9f9f8868823bbb7a530b0307f342de363dc04d. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/ITCC51102149 — a six-check JSON result.
Symphony No. 6 in F Major, Op. 68 "Pastoral", II. Scene by the Brook: Andante molto mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078b8f5653a9fb3055ce295c52c79c8694e4b77939585530203e2727c859b2e1. 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/ITCC51102150 — a six-check JSON result.
Symphony No. 6 in F Major, Op. 68 "Pastoral": III. Merry Gathering of Country Folk. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd6c34fab909d9ec46e248ce05fa0f997602c9e99ec49d4af03873beb033cb61. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ITCC51102151 — a six-check JSON result.
Symphony No. 6 in F Major, Op. 68 "Pastoral": IV. Thunderstorm. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae70811cc40a4926c1203aa93fbeb6350e7c852ce7cdbe729f19f169e3a161a. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ITCC51102152 — a six-check JSON result.
Symphony No. 6 in F Major, Op. 68 "Pastoral": V. Shepherd's Song. Happy and Thankful Feelings After the Storm. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8be9caf05bb8b4465d78c17b715beea57f58916013461c855881e0415fc5907. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ITCC51102153 — a six-check JSON result.
Symphony No. 8 in F Major, Op. 93: I. Allegro vivace e con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8642f92af596730e30cdac9d549463e6c44ef3dc62da3ed8f2ae63fd2d7ba24e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ITCC51102154 — a six-check JSON result.
Schubert: Symphony No. 9 in C Major, D. 944 "The Great"
Liszt: Piano Concertos Nos. 1 & 2 (Remastered)
Violin Concerto in D Minor, Op. 47: I. Allegro moderato (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cee24ad1e8d00536ef14a5cc2a4f2cfff061645df1cbf2cf69792e735066069. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CAAGN1698102 — a six-check JSON result.
Symphony No. 7 in A Major, Op. 92: II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517b019c5187d64d573992dde42b9da58fcbb3bcbed688c2d17290ca0affebdb. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ITCC51102136 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e6ddf7c5e410b9f05d0bdca04258c662f9e9cab49284624ba3124c4b800f94a. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/HKI191102694 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92526dd4e2e213f792cb6f294b60c6a73bda9d07bc00d2a4c81365046bdafaf8. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USXTN1071163 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84ffa962a3f8c22efde3b79ffaa17618bccdea55ebc03dff0131e9bc1f9e6443. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/USXTN1071170 — a six-check JSON result.
Violin Recital: Kolisch, Rudolf - Schubert, F. / Bartok, B. / Schoenberg, A. / Berg, A. / Webern, A. (In Honor of Rudolf Kolisch) (1936-1967)
Grieg: Piano Concerto in A Minor - Chopin: Piano Concerto No. 1 - Grande Polonaise Brillante
Je crois encore entendre (Les Pècheurs de Perles)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18af4f7d45bc40b0daa8d3fb378a89a314713613cebd115c4df1757e223c9bc4. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/ATP130201011 — a six-check JSON result.
Famous conductors of the Past - René Leibowitz
Viens, viens (Orpheus in the Underworld)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8be59c232eff38ffcfe20ea3c6d20be36e7e20f647092e2ab2191fcc22d4f36. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ATP130202111 — a six-check JSON result.
Altesse? (La grande Duchesse de Gerolstein)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8322ec7b3c61fb3ee1a1ae488e97c9283894bf86a92fb6e9af6e7d53fcd0411b. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ATP130459115 — a six-check JSON result.
Offenbach: Orphée aux Enfers and 12 Arias
Berlioz: Roméo & Juliette; Symphonie fantastique
Offenbach: Orpheus in the Underground - La Belle Helene
Leibowitz: Suite / Serenade / Flute Sonata / 3 Pieces for Piano / Motifs
Eleven Viennese Dances, Wellingon's Victory, King Stephan Overture
The German Rococo Flute: Concerto For Flute And Orchestra In G Major / Suite In A Minor For Flute And Strings
Bizet Symphony No. 1. / Schubert Symphony No. 1.
Light Classical (Smooth Classical Music)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7c8218eb3f16dd630627da820b7af19a7e243d1f28357e3bbd9c48f13dcd18. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/USRDG0114548 — a six-check JSON result.
Total Inner Peace: Classical Music for Hard Times
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49cb2b441444818d4c417f1509e689c700e0cffbe5e18d0e4d42b8cf3b030feb. 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/USRDG0226301 — a six-check JSON result.