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 0xeb08ef62df117ea85a9712f11ab042f8d3ba2a3f6e8511afeb544a5bba149e52. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/27ef1a1f-b4ac-48dc-8579-39682ac2d691.json and https://artists.proofprofile.net/proofs/artist/27ef1a1f-b4ac-48dc-8579-39682ac2d691.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0xa60f807ca7cd1ff79802c1fe586a4a6adee18845c85d4a30a6de287eca29a383. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300101 — a six-check JSON result.
Il pianto d'Arianna in E-Flat Major, Op. 7 No.6: VII. Largo Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415f49f970884d933985f3d975503a070f58af90c559cdec0f8f2ee7e6b3e512. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300108 — a six-check JSON result.
Il pianto d'Arianna in E-Flat Major, Op. 7 No.6: X. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x836b4f797a59e7676019e043fa5e707b357e5fc6dc391abf0cab4a3c7d2e5484. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300111 — a six-check JSON result.
12 Concerti da Chiesa, Op. 2 No.4: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543b59225cdbc21751a31716178f9a9d3d8ee61aee2f422225d65b5eb3043bc1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300112 — a six-check JSON result.
12 Concerti da Chiesa, Op. 2 No.4: III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08d52941f38dc51f00d6874cfbdec3e1f1082f9a70f91fefd089a13c9c824de9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300114 — a six-check JSON result.
Concerto Alla Rustica for Strings in G Major, RV 151: I. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545a1ca566478d48d4c8b2e824f99ab802e81f76528eb7979d25b0b15b7263a5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300120 — a six-check JSON result.
Concerto Alla Rustica for Strings in G Major, RV 151: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa4ec717889feddc956d40894f1fffac39e15f5bc33e807de285e1e8a63ad21. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300121 — a six-check JSON result.
Concerto Alla Rustica for Strings in G Major, RV 151: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ed3c5cbade5e4e01ef9eed4bab4a01941a6a6590161f587f880624dc6c8c43. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300122 — a six-check JSON result.
Concerto grosso in B-Flat Major, Op. 1 No.3: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3da073c634ee824b5b0394369744b46bb2a5f760eed0cfa061176cd0db78e52. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300126 — a six-check JSON result.
Concerto grosso in B-Flat Major, Op. 1 No.3: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4956b9382bd30b4514e2235cf72014b22caa27ebd87901c84032b5bea1827e5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300127 — a six-check JSON result.
Concerto grosso in B-Flat Major, Op. 1 No.3: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c71a5839f23d1a6ccb81f1873d12748d57d0bff0c52fd3ad3c3aec44f0c95c. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300128 — a six-check JSON result.
Concerto grosso in B-Flat Major, 1 No.3: IV.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b627dcdf260cc2dc9302a01856a1fb186a577744fdcd1f124a4914916800257. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300129 — a six-check JSON result.
Concerto grosso in B-Flat Major, Op. 1 No.3: V. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f48e55da5766ffc8bc6558b9a22b44ba845b37c8eff50c38d20190092f283ba. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD2300130 — a six-check JSON result.
Haydn: Les sept dernières paroles du Christ en Croix
Rivier: Concerto Brève - Casadesus: Capriccio, Op. 49 - Wiener: Concerto No. 1 'Franco Americain' - Castérède: Concerto for piano and string orchestra
Kunc: Sonate pour violon et piano, Pièce pour alto et piano, Simples chansons pour piano et orchestre de chambre
Felice Dall'Abaco: Concerto d'église No. 4, Op. 2: II. Largo
Concerto d'église No. 4, Op. 2: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5daaa8f90060293eaef82e882f68e9256210a884f7469668b0404ac378f8443d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DGA092381193 — a six-check JSON result.
6 Flute Concertos, Op. 10, No. 1 in F Major, RV 433: I. Allegro
J.S. Bach: Violin Sonatas & Partitas, BWV 1001-1006 (Remastered 2024)
Mayseder, Praeger & Others: Violin & Guitar Virtuoso Pieces (Remastered 2024)
Call: Complete Guitar Quartets (Remastered 2024)
Vivaldi: The Four Seasons (Remastered 2024)
Louis-Gabriel Guillemain, Vol. 2: Amusement, Op. 18 – La Furstemberg & Variations (Remastered 2024)
Louis-Gabriel Guillemain, Vol. 1: Amusement, Op. 18 - Capriccios Nos. 1-12 (Remastered 2023)
Vivaldi: The Four Seasons (Arr. for Chamber Ensemble)
Guillemain: Douze Caprices pour le violon seul, Op. 18
Bach: 3 Sonatas and Partitas for Solo Violin, BWV 1001-1006
Huber: Phantasie Op. 17, Sonata No. 5 & 6
Alard : Trois duos pour 2 violons, Op. 27
Graun: Konzertante musik mit viola da gamba
Concerto a violono e viola da gamba in C Minor, GraunWV A:XIII:3: I. Allegro con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb915b7f38eedbeaded1c240c708fed4fb2fadc5b97b3bc6251084a558ffd2137. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1722908 — a six-check JSON result.
Concerto a violono e viola da gamba in C Minor, GraunWV A:XIII:3: II. Adagio con sordini
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4696a9a29f8b06d5ee93b10d7733a596d9a3ba16e529ea6c5c89dafe62b24b2d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1722909 — a six-check JSON result.
Concerto a violono e viola da gamba in C Minor, GraunWV A:XIII:3: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x627dd180fc73417ee707d79fd232a089bc06e54b0ff3d2244dcdf93fe98f6b22. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1722910 — a six-check JSON result.
Trio a due viola da gamba e basso in G Major: I. Adagio (andante)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6117ab04e3a6a706638ecebfe45e00401e65407db70ea79d7975a94d2beb9dc2. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1722911 — a six-check JSON result.
Trio a due viola da gamba e basso in G Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2be39331d40e31be21d8451957d502abf833f01db32409615e870fcc41b7afa. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1722912 — a six-check JSON result.
Trio a due viola da gamba e basso in G Major: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66831cf7fa6d89e649a02b3781e0396836a3b1fb2cb076e366acb864e0461912. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1722913 — a six-check JSON result.
Concerto per la viola da gamba in A Minor, GraunWV A:XIII:14: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da667a63884f90231c3663bd64271ac253f4b73ebf1da4e4f4772b82c25e764. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1722914 — a six-check JSON result.
Concerto per la viola da gamba in A Minor, GraunWV A:XIII:14: II. Arioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed74f1674afe0e7b547ffabc8689008e53ffe4ab46f1cbff7a56c341bf4c531. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1722915 — a six-check JSON result.
Concerto per la viola da gamba in A Minor, GraunWV A:XIII:14: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac21595eb6576efedb96b2ec908f72ee5482e044161c1beb945415c4b7360b7c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1722916 — a six-check JSON result.
Sonate a tre, violono ovvero viola da gamba, violono quinto accordio e basso cembalo in A Major: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34a81711df218ab11e746a322c18cbc78e4e417db8142e93180b0269be5d7e1. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1722917 — a six-check JSON result.
Sonate a tre, violono ovvero viola da gamba, violono quinto accordio e basso cembalo in A Major: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75ffd662252f2e9c9d88800da98c335b5a9cc28075978809acf39fd099138b8. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR10S1722919 — a six-check JSON result.
Gilles Colliard: J. S. Bach, Violins Concertos
Chaconnes for Unaccompanied Violin (L'arte del violino, Vol. 3)
Gilles Colliard: Joseph Haydn, 3 Violin Concertos
Tartini: The Art of Bowing for Unaccompanied Violin (L'arte del violino, Vol. 1)