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 0x2d0af2bcf1f35dfc0b909abf4a348c621e963962b69976bb583dbdd84a6fd0b6. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/053c868c-d201-45bd-b49f-3033151258bf.json and https://artists.proofprofile.net/proofs/artist/053c868c-d201-45bd-b49f-3033151258bf.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.
Violin Concerto in A Major, RV 343: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa5366f36ea2e3865e0ef0d4dbde6a697619c5f1da1792f3bc8b5aa65948d2e. 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/FR46Y2355001 — a six-check JSON result.
Violin Concerto in A Major, RV 343: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60864fa4d130f1b181867d121bb72f10dc6a49a82669191fe2336a9addb0f739. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR46Y2355002 — a six-check JSON result.
Violin Concerto in A Major, RV 343: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29eb458034bf4f7ac59842159492c1bcb2df0233ef9deb5e898c6272689797b8. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/FR46Y2355003 — a six-check JSON result.
Violin Concerto in D Minor, RV 240: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfcd1a71689660a4bbdd97a25a5f9d35f7f72fa90e45bd17510fc98bc8d4da8. 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/FR46Y2355004 — a six-check JSON result.
Violin Concerto in D Minor, RV 240: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2348d7cae0b5c4d0244cf425088ed58d190fe5df491f0c1e651b32c782ba9d08. 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/FR46Y2355005 — a six-check JSON result.
Violin Concerto in D Minor, RV 240: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28ad73550952c6316a5f52ffbba340b00f5f8cb8526e9cd1e3bcdc7d514b565b. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/FR46Y2355006 — a six-check JSON result.
Violin Concerto in D Major, RV 230: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e42908c3a6fe72e6bd48ae10490266c5bc0e8418c07c1fb657401fec192f983. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FR46Y2355008 — a six-check JSON result.
Violin Concerto in D Major, RV 230: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3736f06cfbd08b7012078214077b34ca7a871ceb654cc70010a56f35d2dfbaa0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR46Y2355009 — a six-check JSON result.
Violin Concerto in G Minor, RV 332: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407dd7a78e930f13aa1f3da418ccbadad68603ba09a3a385d33d6e09e96bd68f. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/FR46Y2355010 — a six-check JSON result.
Violin Concerto in G Minor, RV 332: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968ab52fa0e381ad85b81158f83ecfad350a27c03450f7e73fcf72eaa98ef22c. 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/FR46Y2355011 — a six-check JSON result.
Violin Concerto in C Minor, RV 197: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5cae5e1fb82941f178bb108bad4ff4e21ada94d87924f0b6896c0e7a7db2843. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/FR46Y2355030 — a six-check JSON result.
Violin Concerto in D Major, RV 210: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be8e9a09917fe35a1c73658423e89b98c2216298b8b73c43fc5adcc1fdf85e6. 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/FR46Y2355017 — a six-check JSON result.
Affetti Napoletani: 18th Century Neapolitan Music
Sinfonia da camera III in G Minor, Op. 2: I. Adagio Sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0107483da62662f2e90ecfc9d2bde35edfbc5082280886780a77c7a2830916e7. 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/ITLF52415407 — a six-check JSON result.
Riccio: Vocem iucunditatis, Sacred & Instrumental Music