thumb|Antonio Vandini Antonio Vandini (1691 – 1778), a close friend of Giuseppe Tartini, was a cellist and composer. He was an eighteenth-century cellist and composer known for his performances in no
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 0xfca406a1bf801d705d47882e25fd0197bf0d38cb774738e4a9452a2edfd7c75e. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a25a9139-cd31-4f7a-a56b-9309b411a859.json and https://artists.proofprofile.net/proofs/artist/a25a9139-cd31-4f7a-a56b-9309b411a859.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Giuseppe Tartini: Concerti e Sonate per violoncello piccolo
Concerto for Cello, Strings and Basso Continuo in D Major: I. Allegro
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 0xdd645ae9c2900db031acf62bbd8ecc655850a51dd480bdfbb0545d609f596f76. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/FR46Y1947801 — a six-check JSON result.
Concerto for Cello, Strings and Basso Continuo in D Major: II. Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ab81b6ed610504dccbe855ec9549bcb7dc1432f94fa93a36f18bd30411a334e. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR46Y1947802 — a six-check JSON result.
Concerto for Cello, Strings and Basso Continuo in D Major: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2885c32b76f1637822606867991a24d820b9c7345ecfa8cb91c21fe82441551. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/FR46Y1947803 — a six-check JSON result.
Concerto for Cello, Orchestea and Basso Continuo in D Major, GT 1.D34: III. Grave ed espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0f7bfb5f9536028faf5a026aaf250c4c6ad70abecefe5b3d212120b59094e0. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR46Y1947818 — a six-check JSON result.
Sonata for Cello & Continuo in A Minor: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc778f14fd5d3053744957155658c7cf77fab7948691f3ee72b464434668f8535. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBLLH2166310 — a six-check JSON result.
Sonata for Recorder, 2 Violins & Continuo in C Minor: II. Fuga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bbcd7ef9d0fc92bd61bc47e2b42631115c2e0865ff67c3699af2a23930970f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBLLH2166302 — a six-check JSON result.
Sonata for Recorder, 2 Violins & Continuo in C Minor: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45702698f7be9e0659ede28e60ad0a9e0480f0afdc4499fd05285359c44d3f43. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBLLH2166303 — a six-check JSON result.
Sonata for Recorder, 2 Violins & Continuo in G Minor: II. Fuga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f4298b7412203410f5bd5fb2664e1e08da93c1d47b5ea631af22ac71620a11. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLLH2166314 — a six-check JSON result.
Sonata for 2 Violins & Continuo in B Minor: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1f14f8d0b680b36711a3dc01479065f8e4c9d94f670952d88d955c1e3d01903. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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/GBLLH2166317 — a six-check JSON result.
Venetian Cello Sonatas. Under the Shade of Vivaldi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f32bcaa78eeed76ca3bcbc366d0ec5ae7782323415a7d862ee97da5628e0ee7. 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/FR46Y1846501 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe207128313f8cb4ef01b74c1db2cd2d1d63a606e7fa199bd6ad5577e7fba226c. 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/FR46Y1846502 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x015fca90b078990e939e85ba33cb4d9334cf26f90ea3b60be929b0d47427bc21. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR46Y1846503 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45840e6a1b80fec7f1eb746918860f87699075abe3d1a6d2192208908a17b909. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR46Y1846504 — a six-check JSON result.
Sonata VI in G Major, Op. 1 No. 6: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a5555530cabf57cc96330e19a28c9e8d64b101b331aea9c6213802c86c5aa22. 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/FR46Y1846505 — a six-check JSON result.
Sonata VI in G Major, Op. 1 No. 6: III. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1fce31bf6652c0a32b99b6eb2dabae21dbccb4f48a45309a1958fa353ecfbc. 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/FR46Y1846507 — a six-check JSON result.
Sonata VI in G Major, Op. 1 No. 6: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2aa5d0912e199de1d9ac033fc91c4c206a5834b8098b2a018480dd337d2540b. 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/FR46Y1846508 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287af5969e4d1227f90ed20ee61bf7857fb7897c9a906d54998f07d13ccc3582. 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/FR46Y1846509 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e737bc59c397b9636787a9af261fa2525c86b1c112642ae94719dea88ea6769. 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/FR46Y1846512 — a six-check JSON result.
Sonata à violoncello solo in B-Flat Major, RV 46: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc497dce58c426db7135cf8438f6584ad6adf7154752f389a4f72b78cdc36df. 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/FR46Y1846513 — a six-check JSON result.
Sonata à violoncello solo in B-Flat Major, RV 46: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ff576e3906d6dd0612e7ff7815c85fba3df5cc3dbc70ab7f13cc9b4736f896. 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/FR46Y1846515 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff4392d83a4fc9947d7d22a2fd2a524d85da681eb7e720799535b10bc2a6d3be. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR46Y1846519 — a six-check JSON result.
Giuseppe Tartini & amici, maestri, rivali