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 0x48a76e7e0f891198e0bfad0758b557f90c2033ed6b43024b967ce6cd700c63bb. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c4607740-6e9b-443e-aae1-ea3e4adae2f9.json and https://artists.proofprofile.net/proofs/artist/c4607740-6e9b-443e-aae1-ea3e4adae2f9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
12 Sonate a tre - Sonata VII in D Major, Op. 3: I. Preludio, Largo
Tomaso Albinoni: 12 Sonate a tre Op. 3 (Balletti, Venezia, 1701 - World Premiere Recording On Period Instruments)
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 0x2474083b512c44dc1b0da74e53d349a1f1fa1babca873f1ffdf9262c61435466. 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/ITLF52208808 — a six-check JSON result.
12 Sonate a tre - Sonata VII in D Major, Op. 3: II. Allemanda, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd194aae506781706ed4d8c67c8ed2f024cec5e992750cc690fe1caa0f637c87b. 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/ITLF52208809 — a six-check JSON result.
12 Sonate a tre - Sonata VII in D Major, Op. 3: IV. Sarabanda, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20aadc78bd46cfdd5e1f8f94a1ce02517bfe35a4b6910ddbb96cff303da06255. 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/ITLF52208811 — a six-check JSON result.
12 Sonate a tre - Sonata V in D Minor, Op. 3: I. Allemanda, Largo Appoggiato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97648dc4c5acb82a09707355d7b0ce32e459436e0693ee2817fa0fdbb72b053. 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/ITLF52208812 — a six-check JSON result.
12 Sonate a tre - Sonata V in D Minor, Op. 3: II. Corrente, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd8b59c7e60558e11116f141bd583c5a28d19fb94abe559ea07f8ccdb87e4afa. 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/ITLF52208813 — a six-check JSON result.
12 Sonate a tre - Sonata V in D Minor, Op. 3: III. Giga, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077285601a82c62a5ddf30ce8a6b656b47b0cdaa6959d3618625360ad92391fb. 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/ITLF52208814 — a six-check JSON result.
12 Sonate a tre - Sonata IV in A Major, Op. 3: I. Preludio, Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a902a5a30190e679adddf7b3245cfda89c210597c3ac989ba61fcc72c4509f5. 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/ITLF52208815 — a six-check JSON result.
12 Sonate a tre - Sonata IV in A Major, Op. 3: II. Allemanda, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5315b0539a1fd87900b5992df7f262b31f1ce852e7eff8f892ce3db7bf1dd306. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/ITLF52208816 — a six-check JSON result.
12 Sonate a tre - Sonata IV in A Major, Op. 3: III. Sarabanda, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559ed33e7a6b1da5aebc8d3ede648cee53bdbb3befffa2ea1511618b3cc839d5. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ITLF52208817 — a six-check JSON result.
12 Sonate a tre - Sonata IV in A Major, Op. 3: IV. Giga, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18579d381d4e9bab537e6aeb5991516d2cbe6756e9221a9db886234c36d0b08d. 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/ITLF52208818 — a six-check JSON result.
12 Sonate a tre - Sonata XI in A Minor, Op. 3: I. Allemanda, Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x329be8b6bef1f969a0d03cffe9a08f8616b43af403d634d433aa6be4af747582. 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/ITLF52208819 — a six-check JSON result.
12 Sonate a tre - Sonata XI in A Minor, Op. 3: III. Gavotta, Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd168ab796a0db09205aa5e7265eb2abac91fc2223110b71488a62bc4eac49690. 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/ITLF52208821 — a six-check JSON result.
12 Sonate a tre - Sonata X in E Major, Op. 3: I. Preludio, Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d9529a656308dfea93c26fef195466280eda41b6432b2450a8ae73ebed49ad. 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/ITLF52208822 — a six-check JSON result.
12 Sonate a tre - Sonata X in E Major, Op. 3: II. Allemanda, Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80fc2ca55ec168551c6f5c8b7b6b55b686d215f8418d1cf23a590173b0da7b7. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/ITLF52208823 — a six-check JSON result.
12 Sonate a tre - Sonata X in E Major, Op. 3: III. Corrente, Allegro Assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5099d3e862c40c2708f4535d95aa8bb6c33aa840a0ee1e1737a74f87174a146d. 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/ITLF52208824 — a six-check JSON result.
12 Sonate a tre - Sonata X in E Major, Op. 3: IV. Giga, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578b8db201430df84fdd7a146570e4b27e83be62e08382fe9ea8686467bcdde9. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/ITLF52208825 — a six-check JSON result.