thumb|Fritz Kreisler, Harold Bauer, Walter Damrosch and Casals, at Carnegie Hall on 13 March 1917 Pablo Casals (29 December 187622 October 1973), also known by his birth name, Pau Casals i Defilló (Ca
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 0x684fcb7fb15b7f4412b80fb154cc1fa59794dc058eb99d0c343978f1e5cbdbe5. 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/f0137b66-20c0-40ad-b280-253897025fca.json and https://artists.proofprofile.net/proofs/artist/f0137b66-20c0-40ad-b280-253897025fca.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schumann: Waldszenen, Op. 82: No. 7, Vogel als Prophet
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 0x1f88f76ffc285530400eff26c88c8f38cf7b5f049e107ea5349f93657f9505a0. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FRZ208400907.
Mussorgsky / Orch. Ravel: Pictures at an Exhibition, M. A 24: V. Ballet of the Unhatched Chicks
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8351b345593f212f054aed7f9d19b785872fdb56975404b54443443ee6ad27e2. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBAYC8800867.
Respighi: Gli uccelli, P. 154: II. La colomba
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Daquin: Livre de pièces de clavecin, Suite No. 3: Le coucou
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Vivaldi: Flute Concerto in D Major, Op. 10 No. 3, RV 428 "Il gardellino": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6a8a99054e25f29e40cffb2a838ba88a6df4c7091a17cdd203f20bf7495ca3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0501764.
Vivaldi: Flute Concerto in D Major, Op. 10 No. 3, RV 428 "Il gardellino": II. Cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa66f9dd7bd396085bb11bd29a422cb61d4a38384e26a227969e63d3a988b24e0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC0501765.
Vivaldi: Flute Concerto in D Major, Op. 10 No. 3, RV 428 "Il gardellino": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe3440afe64275e712f002a374cc97478959271c76e3ac99232c745a73b096a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBAYC0501766.
Saint-Saëns: Le carnaval des animaux: XIII. Le cygne
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Schubert: Die Nachtigall, Op. 11 No. 2, D. 724
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f0cac45c9e551e89518b3c96d1a7386bc563156dade9f5402002e9ca59a686a. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GBAYC9704254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac0362025fce133d477ed47f12f24d38a43ca95276338a5a9a46a176d663060a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9603232.
Ravel: 3 Chansons, M. 69: No. 2, Trois beaux oiseaux du paradis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfe30b8efbcd67128fa617241d2e1297d2898a64f9e32a44215bc0b74b9d90e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FRZ119205560.
Rameau: Second livre de pièces de clavecin, Suite en mi: V. Le rappel des oiseaux
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce778e050d40533cded1ecfaeee64629761ee0b62cd56a5124565db1a6a1050c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1900673.
Messager: The Two Pigeons, Act 1: Dance of the Two Pigeons
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Sibelius: Lemminkäinen Suite, Op. 22 "Legends of the Kalevala": No. 2, The Swan of Tuonela
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Stravinsky: Le Chant du rossignol: III. Chant du rossignol
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Sauguet: Tableaux de Paris: III. Quai aux fleurs, marché aux oiseaux
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Mozart: Oiseaux, si tous les ans, K. 307
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2264948ba965e59c64718b05c0d460111e363bd4367159b27897fbce784b05f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA341100704.
Tansman: Pour les enfants, Deuxième recueil: No. 2, Le petit oiseau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf61475d901007c31f7b1ce3829739d1be3102ba91c38c89589fe0b602b05cbc. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ206205504.
Tchaikovsky: Swan Lake, Op. 20, Act II: No. 13d, Dance of the Swans. Dance of the Little Swans
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Delius: 2 Pieces for Small Orchestra: No. 1, On Hearing the First Cuckoo in Spring
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060662c8c339870219509c91099b7f3469e4c47147ae385fa84f2ae91e9fb353. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBAYD8500156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87eb52db27b31b281f9efbd28fdcc174c30858dba76105eccdcd15e2bfe605bb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC8704396.
Mendelssohn / Schumann: Trios (Thibaud / Casals / Cortot) (1927-1928)
Brahms, Bloch & Tchaikovsky: Violin & Cello Works (Live)
Cello Concerto No. 2 in D Major, Op. 101, Hob. VIIb:2: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe384b30b2b8dcd4f88d75a975337b363a1b5519ae9d5a2e15934b3fd8904ceea. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD61809120.
Cello Concerto in B-Flat Major, G. 482: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121c4b0e7e97cbdda43b2607949aa020f383907dd66b59f536a10885e4727ff9. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEAD61809123.
Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: I. Prelude
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa284a9a3418947e0fa30c306c80aa55b6b120d221be91e6cf4ca671e4c0358d5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ132010050.
Choral Music - Bainton, E. / Thompson, R. / Mozart, W.A. / Casals, P. / Mendelssohn, Felix / Parry, H. / Durufle, M.
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Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: II. Allemande
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Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: IV. Sarabande
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75cde6134306123c548508e408a8b7e300638ac684ce0d6add10377e0004b299. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USASX0830004.
Cello Suite No. 1 in G Major, BWV. 1007: I. Prélude
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Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: III. Courante
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Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: V. Menuets I & II
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Bach, JS: Cello Suite No. 1 in G Major, BWV 1007: VI. Gigue
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Bach, JS: Cello Suite No. 2 in D Minor, BWV 1008: I. Prelude
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Bach, JS: Cello Suite No. 2 in D Minor, BWV 1008: II. Allemande
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Orchestral Suite No. 3 in D Major, BWV 1068: III. Gavotte I & II
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Bach, JS: Cello Suite No. 2 in D Minor, BWV 1008: III. Courante
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Bach, JS: Cello Suite No. 2 in D Minor, BWV 1008: VI. Gigue
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Bach, JS: Cello Suite No. 3 in C Major, BWV 1009: I. Prelude
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