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 0xf9386d1aaaa1ad90db787f57d9b0b16722c375e2438bc11d83e884a9cde1c456. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8682c90a-b544-42ec-b3c2-432e6bd85f40.json and https://artists.proofprofile.net/proofs/artist/8682c90a-b544-42ec-b3c2-432e6bd85f40.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
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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
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Vivaldi: Flute Concerto in D Major, Op. 10 No. 3, RV 428 "Il gardellino": II. Cantabile
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Vivaldi: Flute Concerto in D Major, Op. 10 No. 3, RV 428 "Il gardellino": III. Allegro
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Saint-Saëns: Le carnaval des animaux: XIII. Le cygne
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Schubert: Die Nachtigall, Op. 11 No. 2, D. 724
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Ravel: 3 Chansons, M. 69: No. 2, Trois beaux oiseaux du paradis
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Rameau: Second livre de pièces de clavecin, Suite en mi: V. Le rappel des oiseaux
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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
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Tansman: Pour les enfants, Deuxième recueil: No. 2, Le petit oiseau
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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
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Bartók: Concerto for Two Pianos and Percussions & Sonata for Two Pianos and Percussions
Bartók: Concerto for Two Pianos and Percussion, Sz. 115: I. Assai lento - Allegro molto
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Bartók: Concerto for Two Pianos and Percussion, Sz. 115: III. Allegro ma non troppo
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Bartók: Sonata for Two Pianos and Percussion & Pieces from Mikrokosmos
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Ohana : Collected Works [The Erato Recordings]
Presque Rien No. 1 (Lever du Jour au Bord de la Mer)
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Ensemble Instrumental de Musique Contemporaine de Paris
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Constant: Psyché, pour deux pianos et percussions
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Bartók: The Miraculous Mandarin, Concerto for Orchestra, Piano Concertos, Violin Concerto No. 2, Concerto for two Pianos, Percussion and Orchestra
Bartók: The Miraculous Mandarin, Op. 19, Sz. 73: I. Beginning - Curtain Rises
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Bartók: The Miraculous Mandarin, Op. 19, Sz. 73: III. Second Seduction Game
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Bartók: Rhapsody for Violin and Orchestra No. 1, Sz. 87: I. Lassú. Moderato
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Bartók: Rhapsody for Violin and Orchestra No. 1, Sz. 87: II. Friss. Allegretto moderato
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Bartók: The Miraculous Mandarin, Op. 19, Sz. 73: VI. The Chase - The Tramps Leap Out
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Bartók: Rhapsody for Violin and Orchestra No. 2, Sz. 90: I. Lassú. Moderato
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Bartók: Piano Concerto No. 3 in E Major, Sz. 119: I. Allegretto
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Bartók: Rhapsody for Violin and Orchestra No. 2, Sz. 90: II. Friss. Allegro moderato
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Bartók: Concerto for Orchestra, Sz. 116: I. Introduzione. Andante non troppo - Allegro vivace
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Bartók: Concerto for Orchestra, Sz. 116: II. Giuoco delle coppie. Allegretto scherzando
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Bartók: Concerto for Orchestra, Sz. 116: III. Elegia. Andante non troppo
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Bartók: Concerto for Orchestra, Sz. 116: IV. Intermezzo interrotto. Allegretto
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Bartók: Concerto for Orchestra, Sz. 116: V. Finale. Pesante - Presto
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Bartók: Concerto for Orchestra, Viola Concerto, Concertos for two Pianos and Percussion, Sonata for two Pianos and Percussion & Music for Strings, Percussion and Celesta
Bartók / Compl. Serly: Viola Concerto, Sz. 120: I. Moderato
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Bartók / Compl. Serly: Viola Concerto, Sz. 120: III. Allegro Vivace
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