thumb|215px|Guy Ropartz (date unknown) Joseph Guy Marie Ropartz (; 15 June 1864 – 22 November 1955) was a French composer and conductor. His compositions included five symphonies, three violin sonatas
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 0x2ee0f339b4eeb8a790364c8b217119f7b7412ea6c9cb15879f44115948e40dc3. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea202e65-5948-41a4-a7e1-00208eb66640.json and https://artists.proofprofile.net/proofs/artist/ea202e65-5948-41a4-a7e1-00208eb66640.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Ropartz: Psaume 136 / Le Miracle De Saint Nicholas
Ropartz: Violin Sonata No. 2 - Sonatine for Flute and Piano - Cello Sonata No. 2
Ravel: Introduction & Allegro; Debussy: Sonata For Flute, Viola & Harp
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 0x496d5414a59757e8819143d9ed419c990a8173913eb21f37b5c4630dfb09234e. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBF076110180.
Sonata For Flute, Viola And Harp, L. 137: 1. Pastorale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d164cf4671258affda32315a0d18efd08529ff2e91906703c376a3c4612b15d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF076110191.
Sonata For Flute, Viola And Harp, L. 137: 2. Interlude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f4be808aa43e1d918d06356b0d91cb1d100a7833748c86d47351519a736cc9. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBF076110192.
Sonata For Flute, Viola And Harp, L. 137: 3. Finale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7a253b0e3e348e10e0fef36223dfa315ce509d66dc6ab3c535400294f623f39. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/GBF076110193.
Prelude, Marine & Chansons for flute, violin, viola, cello & harp: 2. Marine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64319b8d71248cbdbb49018f2743f62672d662b78e47829db827b7512fd6fb4a. 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/GBF076111652.
Ropartz, J.-G.: Quartets, Vol. 3 - String Quartet No. 1 / Fantaisie Breve
Ropartz, J.-G.: Petite Symphonie / Pastorales / Sons De Cloches / Serenade Champetre / Divertimento
Ropartz, J.-G.: String Quartets Nos. 4-6
Ropartz, J.-G.: String Quartets Nos. 2 and 3
Ropartz, J.-G.: Piano Trio in A Minor / String Trio in A Major / Prelude, Marine and Chansons
Ropartz: The Three Sonatas for Violin & Piano
Ropartz, J.-G.: Pecheur D'Islande / Rhapsodie / Oedipe A Colonne
Ropartz: Musiques au jardin / Jeunes filles / Nocturnes / Scherzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33c3843d430f121ec3aaadda7fd2c7176dc2838ca239c7ef859998db71342482. 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/CAJ720225509.
Ropartz: Miracle De Saint Nicolas (Le) / Psaume 136
Ropartz : Ouverture, Variations et final, Musiques au jardin, Nocturne
Ropartz: Prélude, Marine et Chansons & Sonate pour violon et piano No. 1 (Mono Version)
Ropartz: Jeunes filles: No. 5, La capricieuse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x006d1da1424b0590347af4f3b950550044744a0d442b64ab640a66d6ac8f74ab. 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/FRZ206701105.
Piece for Trombone and Piano in E-Flat Minor. Lento - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc196f4aacd85ca170381521ae660d76a877779e479f11c9b59999fded47c38. 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/NLA460910607.