Marc Coppey (born 1969 in Strasbourg) is a French contemporary classical cellist. Biography In 1988 at the age of 18, Marc Coppey won the two highest prizes of the International Johann Sebastian Ba
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 0x8b63a28f27b3774ac29ea165c88ad31fbbbc124caff3c830a17299faafb88943. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8ae708b5-701e-4a35-8b3f-39fb8286b86c.json and https://artists.proofprofile.net/proofs/artist/8ae708b5-701e-4a35-8b3f-39fb8286b86c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Debussy, Chausson & Emmanuel: Chamber Works
Après un rêve, Op. 7 No. 1 (Arr. For Cello and Piano by Pablo Casals)
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 0x980107d74e4c19cd6f1e72450567773f6b25d0ede329c92841fe1a5551dca475. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE219782513.
The Carnival of the Animals, R. 125: XIII. The Swan (Le Cygne)
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Sonata for Solo Cello, Op. 8: I. Allegro maestoso ma Appassionato
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Dmitri Shostakovich: Cello Concertos Nos. 1 & 2
Cello Concerto No. 1 in E-Flat Major, Op. 107: I. Allegretto
Polish National Radio Symphony Orchestra (NOSPR)
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Cello Concerto No. 1 in E-Flat Major, Op. 107: II. Moderato
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Cello Concerto No. 1 in E-Flat Major, Op. 107: III. Cadenza
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Cello Concerto No. 1 in E-Flat Major, Op. 107: IV. Allegro con moto
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Cello Concerto No. 2 in G Minor, Op. 126: II. Allegretto
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Beethoven: Complete Works for Cello and Piano (Live)
Dvořák: Cello Concerto & Klid - Bloch: Schelomo
Cello Concerto in B Minor, Op. 104 / B. 191: I. Allegro
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Schubert: Arpeggione, Sonatina & Trio Op. 99
Arpeggione Sonata in A Minor, D. 821: Adagio
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Dutilleux: Tout Un Monde Lointain, Trois Strophes - Caplet: Epiphanie
Matalon: El Torito Catalan ; Trames III & V
Franz Schubert: String Quintet, D. 956 & String Quartet No. 7
Suite No. 1 in G Major, BWV 1007: I. Prélude
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Suite No. 1 in G Major, BWV 1007: II. Allemande
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Suite No. 1 in G Major, BWV 1007: III. Courante
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Suite No. 1 in G Major, BWV 1007: IV. Sarabande
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Suite No. 1 in G Major, BWV 1007: V. Menuet l & ll
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Suite No. 4 in E-Flat Major, BWV 1010: V. Bourrée l & ll
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Suite No. 1 in G Major, BWV 1007: VI. Gigue
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Suite No. 5 in C Minor, BWV 1011: I. Prélude
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Suite No. 2 in D Minor, BWV 1008: II. Allemande
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Suite No. 2 in D Minor, BWV 1008: III. Courante
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Suite No. 2 in D Minor, BWV 1008: IV. Sarabande
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Suite No. 2 in D Minor, BWV 1008: V. Menuet l & ll
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Suite No. 2 in D Minor, BWV 1008: VI. Gigue
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Suite No. 3 in C Major, BWV 1009: I. Prélude
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Suite No. 3 in C Major, BWV 1009: II. Allemande
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Suite No. 3 in C Major, BWV 1009: III. Courante
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Suite No. 3 in C Major, BWV 1009: IV. Sarabande
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Suite No. 3 in C Major, BWV 1009: V. Bourrée l & ll
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Suite No. 3 in C Major, BWV 1009: VI. Gigue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40720396112d771aafe670f9ef8ba862f4eebb9772f89937d59fc989a2ee5879. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR46Y0331618.