1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c9ed28de59f90ac6bc27b050c07c31266b580dcbc4dc4ae9c0a4a04fcb98dc. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4cb372fe-2a01-4c76-bf6f-7509e753c5ef.json and https://artists.proofprofile.net/proofs/artist/4cb372fe-2a01-4c76-bf6f-7509e753c5ef.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1846, dernière année à Nohant - Chopin: Cello Sonata; Piano Works
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1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. GET OTSBitcoinBlockVerifyURL → block OTSBitcoinBlock must exist at that height 3. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 4. GET OTSVerificationAPI → pre-computed 6-check result from server 5. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e77aeadf0bfd9511680b84ae38e4d62f048b9e5f0eeaf0066de6f92971cc8c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/6PVJh5bEjXBcDK0fnXKfjQ.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/6PVJh5bEjXBcDK0fnXKfjQ.
{"copyright_id":"0x64371ecb051cfb46d1cf76f1ebd0802cfdbb84e9d927d9f1f0afe893dabed203","isrc":"FRZ141414020","name":"3 Mazurkas, Op. 63: I. Vivace","registered_at":"2026-06-20T08:23:27Z","spotify_id":"5rEdIkhuB1BzziHbM2XxEB","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64371ecb051cfb46d1cf76f1ebd0802cfdbb84e9d927d9f1f0afe893dabed203. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/5rEdIkhuB1BzziHbM2XxEB.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/5rEdIkhuB1BzziHbM2XxEB.
Cello Sonata in G Minor, Op. 65: I. Allegro moderato
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d680882a6ab57a4926aa2668db77544d0dde755385195fb53ce11d10d1c32f2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/57ViOPIAGDo8mvVGoeq63b.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/57ViOPIAGDo8mvVGoeq63b.
Cello Sonata in G Minor, Op. 65: II. Scherzo - Allegro con brio
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14fb3284c172de8787df2bfdb25342a15797d40e1b11c7e646a7bb5b74611481. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/2sH03BP0p51jg7FweZbux7.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/2sH03BP0p51jg7FweZbux7.
Cello Sonata in G Minor, Op. 65: III. Largo
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc028481b407ad450f87bcc135047edf75904cb03bb9ec6a322147ac35d5f95. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/3zrcDZ9hPNkZuq20pxPb9o.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/3zrcDZ9hPNkZuq20pxPb9o.
Cello Sonata in G Minor, Op. 65: IV. Finale (Allegro)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4acf465a4446b3c70b82a459f86eb3ed7c22b06609e6b1777f2c666684111b0. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/3vbB8cZABSQEKKLoyW9wbL.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/3vbB8cZABSQEKKLoyW9wbL.
{"copyright_id":"0x2085f3780b05d37bbd95a0e5118533746f3cfc5ae5e31cd6ee9ef70e5c1ab54d","isrc":"FRZ141414100","name":"Waltzes, Op. 64: II. Tempo giusto","registered_at":"2026-06-10T05:03:37Z","spotify_id":"1aBIzn1Rs0kaMg9MFvZRYO","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2085f3780b05d37bbd95a0e5118533746f3cfc5ae5e31cd6ee9ef70e5c1ab54d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/1aBIzn1Rs0kaMg9MFvZRYO.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/1aBIzn1Rs0kaMg9MFvZRYO.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e2b790bc66a6092deb308455d188b471e6ebee5f0549187eea8093e5bab68d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/7pPsO4ELcYKjpR6NIEA449.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/7pPsO4ELcYKjpR6NIEA449.
Four Mazurkas, Op. 67: IV. Moderato animato
Cello Sonata No. 2 in F Major, Op. 123: I. Maestoso (Largamente)
Saint-Saëns: Cello Concerto No.1: Sonatas Nos. 2 & 3
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab10513b447ebfcec48c523eee213f128e74156a01eacf67286b7b660bd7b970. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/71SJ5tsriPKcGCd9DXZzFS.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/71SJ5tsriPKcGCd9DXZzFS.
Cello Sonata No. 2 in F Major, Op. 123: II. Scherzo con Variazioni (Allegro animato)
Cello Sonata No. 2 in F Major, Op. 123: III. Romanza (Poco adagio - Agitato)
Cello Sonata No. 2 in F Major, Op. 123: IV. Allegro non troppo, grazioso
Cello Sonata No. 3 in D Major, Op. Posth (Unfinished): I. Allegro animato
Cello Sonata No. 3 in D Major, Op. Posth (Unfinished): II. Andante sostenuto
Cello Sonata in D Minor, L. 135: I. Prologue (Lent, sostenuto et molto risoluto)
Dutilleux: Tout un monde lointain; 3 Strophes sur le nom de Sacher / Debussy: Cello Sonata
Cello Sonata in D Minor, L. 135: II. Sérénade (Modérément animé)
Cello Sonata in D Minor, L. 135: III. Finale (Animé, léger et nerveux)
Sonata for cello and piano, Op. 65: III. Largo
harmonia mundi - Spring Summer 2013, hmnews
Les plus belles musiques classiques pour les enfants
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786b3ccf42b67d5824969ba774db1e4e3ec59842697d1c39b4e4c320839ea0bf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/7tgn2uJC8YaBRCryKBQRin.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/7tgn2uJC8YaBRCryKBQRin.
{"copyright_id":"0xea1c1b32bc9acbbea9c23c411572db356145ee16dc5f7d754c45705004067d27","isrc":"FR60Z1100840","name":"Marche royale du lion","registered_at":"2026-06-25T17:27:29Z","spotify_id":"2LtAGYOhmdNljYHWGxCDU4","type":"track"}
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1c1b32bc9acbbea9c23c411572db356145ee16dc5f7d754c45705004067d27. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), registered by our registry partner. Bridge: the canonical record at https://artists.proofprofile.net/proofs/track/2LtAGYOhmdNljYHWGxCDU4.json contains the same CopyrightID — hash it and compare to OTSHash, then confirm the Bitcoin block independently via OTSBitcoinBlockVerifyURL or https://artists.proofprofile.net/api/v1/bot/ots/verify/track/2LtAGYOhmdNljYHWGxCDU4.
Fernand de La Tombelle: Musique de chambre, chorale et symphonique (Portraits, Vol. 5)
Itinérance: Lento. (Prégnant, du fond des âges)
Emmanuelle Bertrand: Le violoncelle au XXe siècle