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 0xa8cb43643399334c32f515ba9a72b4d7d19071f7190b01678aa43c71ae2f3bfb. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd79a018-46bd-4fa9-bb5c-f65bfa4781dd.json and https://artists.proofprofile.net/proofs/artist/fd79a018-46bd-4fa9-bb5c-f65bfa4781dd.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Sardelli: Baroque Concertos, Psalm, Chamber Music
Psalm 69, Domine ad adjuvandum me: I. Domine ad adjuvandum me. Allegro molto
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 0xa10038af5c2b5a4d7320f8f844393020d76345c816a7bdfa34befc6990a99e11. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331307883 — a six-check JSON result.
Psalm 69, Domine ad adjuvandum me: II. Sicut erat in principio. Andante molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d01ede26e8b283011f1ededb9154f588798701322c476e50fc8ea5b85c0440. 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/NLY331307884 — a six-check JSON result.
Psalm 69, Domine ad adjuvandum me: IV. Amen. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedeb46cb9b2399b63bef6f7c81345b8d1855354a72f801ee0ce1dc45754d4146. 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/NLY331307886 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x682bbeb4bbd9a5f5ad5611bb5876f8b39c78cc6fc0b2283797e7014a44025f94. 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/NLY331307887 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70097105e4d13e2f8ddfb75c36e7fa7bd05d6fd598875c5225649f882bba3417. 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/NLY331307890 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dafe247400c9aa18944b897e1a262b0eeba1bc8011d8e76f91c42dc826e7488. 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/NLY331307892 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x376b2ea8209376c2eecc0d646c28e854c8e52684d48642f0f50e538bc0cac910. 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/NLY331307893 — a six-check JSON result.
Concerto in G Minor: III. Allegro ma poco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd42c381bcd92654ac53d0bc90940c3518a29f4512cf955c890107c51e325114f. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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/NLY331307895 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85077a86be3980ff94fd58e25a5cc7a627c1bef33351067f4db2844b4c5169f4. 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/NLY331307898 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f88d52816d224cb02128d8b0860c717837d7354bbf2b7830d29cf2924aacc9. 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/NLY331307899 — a six-check JSON result.
Suite de pièces pour le clavecin: II. Le plaintif
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3754db8484e5e1f3571014b542e495979cc3dd70893100c9ab4597b7ba583f0. 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/NLY331307902 — a six-check JSON result.
Violin Concerto in D Major, Op. 4 No. 11, RV 204: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa32eb44fbc1c234b0c1d6fedbf71f59a5598b2c379239617af8d2d624508236. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ITN321917799 — a six-check JSON result.
Music for Two, Vol. 2 (Jean-Marie Leclair Sonate for Two Violins Op. 3 Anton Martynov Baroque Suite Nr.2)
Martha Argerich and Friends Live from the Lugano Festival 2016
Ravel: Gaspard de la nuit, M. 55: I. Ondine (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e4ce117573bc034cb06ad75f53b58e2fda0a7a3364383cc0810f706323304c5. 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/CH8291700718 — a six-check JSON result.
Mozart: Sonata for 2 Pianos in D Major, K. 448: I. Allegro con spirito (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0dfd977cf516270c6fdb30ac6f0d5a922fb18122b6f7ec87ec45c33b58adf64. 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/CH8291700724 — a six-check JSON result.
Mozart: Sonata for 2 Pianos in D Major, K. 448: II. Andante (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9574732b3eae3a2d4ccb5c45dbd9a476ffaa44f6b73457b2e558362d46d31e5a. 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/CH8291700725 — a six-check JSON result.
Mozart: Sonata for 2 Pianos in D Major, K. 448: III. Molto allegro (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60328f4279e65d7c54fe70a3a0cb1e98e10302b99d7d9bddb6470530acd7421e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/CH8291700726 — a six-check JSON result.
Falla / Arr. Lafitte: La vida breve: Danza española No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d2895d0dd55ca47c71ae4fdda42f7df94152afad5fbf9daa4cc73b6f2eca5a8. 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/CH8291700727 — a six-check JSON result.
Ravel: Piano Concerto in G Major, M. 83: II. Adagio assai (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7157873fce8614f60b22f2a690af3881ba0a6ae51903eeda07ec1ad032bbdd. 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/CH8291700730 — a six-check JSON result.
Ravel: Piano Concerto in G Major, M. 83: III. Presto (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe70a9a197088461812027854b55466a10002069ea396cbceba3fd3b2923dfc4f. 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/CH8291700731 — a six-check JSON result.
Beethoven: Fantasia in C Minor, Op. 80, "Choral Fantasy": I. Adagio (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cc76e90df28b5ffd9dc85bbf569969a823940b134c3a57e38c78adfd7e2c57b. 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/CH8291700732 — a six-check JSON result.
Beethoven: Choral Fantasy, Op. 80: II. Finale (Allegro - Meno allegro - Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a487ad3793908a5b81047e342061c0bb2e96eb8dbbd322c61e03cbc785e1d41. 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/CH8291700733 — a six-check JSON result.
Brahms: Trio in E-Flat Major, Op. 40: IV. Finale (Allegro con brio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd85bbd60f639997214973602dbf705d48d852ceed74fdcc7c3d5ef10400a84a0. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/CH8291700737 — a six-check JSON result.
Bach, JS: Violin Sonata No. 4 in C Minor, BWV 1017: I. Largo (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb067cff4dd7edc8b8e36d0cfc50c18b0256b9e9575628dab1dc6d6a26e98f3b3. 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/CH8291700741 — a six-check JSON result.
Violino d'amore (Concerti di Antonio Vivaldi, Federico Maria Sardelli, Anton Martynov, Gianluca Bersanetti)
Baroque Violin Concerto in G Minor, I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f9d0fa6ad7392bef835af8884c44f8fa4460cdcd9741ff399663fe4d7b5de1e. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DEAR41895663 — a six-check JSON result.