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 0xbce864ff2b4d84632c926ab137a66e9c78a9eaefac2b3251543458c220808672. 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/b582fe27-f1bc-4a79-b9e7-5e0fa4ff2fd9.json and https://artists.proofprofile.net/proofs/artist/b582fe27-f1bc-4a79-b9e7-5e0fa4ff2fd9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Oboe Concerto in C Major, Op. 9 No. 5: 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 0xf68bdd837a7b2515edcd5358c904d9ee2fa5059bb5f03f3bfce833c14fc4320e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CZH401121543 — a six-check JSON result.
Oboe Concerto in C Major, Op. 9 No. 5: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee9b4e907858d5e72126f4ddde59968965718241a6c848343b06905a5b460a15. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/CZH401121544 — a six-check JSON result.
Oboe Concerto in D Minor, Op. 9 No. 2: I. Allegro e non presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48a76170a9367ffa04cc68e99dd9c9bf333aa2eb6b93cac49bcf95436a4bdb2. 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/CZH401121546 — a six-check JSON result.
Oboe Concerto in D Minor, Op. 9 No. 2: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39949a876ef50553eb41b431bea6c63e73d7fd64cfb436d4353bf0ee3c946f8a. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/CZH401121547 — a six-check JSON result.
Oboe Concerto in D Minor, Op. 9 No. 2: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88fbfc9a2e88ba3b436510591339ee62f2849b29c97a7ee50f9435b198ce5640. 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/CZH401121548 — a six-check JSON result.
Oboe Concerto in C Major, Op. 7 No. 12: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc07dfbfa0b398e4b30d1c8b2a42aae72c93cf8233474c28e47499e57110b4686. 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/CZH401121549 — a six-check JSON result.
Oboe Concerto in C Major, Op. 7 No. 12: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44f6e15333feb7f74805b27bb69eac0d8057be505331760828308560789e050. 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/CZH401121550 — a six-check JSON result.
Oboe Concerto in C Major, Op. 7 No. 12: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49033e3e09253b70b7a1c3d89698eabd15a98059b9610845ae1323b4ea181de1. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/CZH401121551 — a six-check JSON result.
Oboe Concerto in B-Flat Major, Op. 7 No. 3: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a1b7409789a05f6cdd76bdeaf79e5c9c063fd6b5334f99b783e3e32b80736f4. 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/CZH401121552 — a six-check JSON result.
Oboe Concerto in B-Flat Major, Op. 7 No. 3: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2055df0acfa818284e20a850e4dd8b2f01fac5120f6d14b639c659594b8c4b3e. 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/CZH401121553 — a six-check JSON result.
Oboe Concerto in B-Flat Major, Op. 7 No. 3: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308c62a3046e8c22c3e08b2bd206c5d89157748a3aa79950634f4d6d3b32f1c2. 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/CZH401121554 — a six-check JSON result.
Oboe Concerto in G Minor, Op. 9 No. 8: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa51564ddfe54b4cde5cb1de89cd8e3839e8fe32bcdc462d7cff6448e840cea9. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CZH401121555 — a six-check JSON result.
Oboe Concerto in G Minor, Op. 9 No. 8: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73cf9885eec957c090ce5e76e122eece348e8db80371ab8121a48be6c30bf47c. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CZH401121556 — a six-check JSON result.
Oboe Concerto in G Minor, Op. 9 No. 8: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23eedd9b19e214f6a4743931081eea45d88989625a9a6ae12135dbcb0787c05b. 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/CZH401121557 — a six-check JSON result.
Oboe Concerto in B-Flat Major, Op. 9 No. 11: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcefb5b8ebbbc192cbaf64e5fea8efdd2a8c73dcc18e5710c0acf302038769a7d. 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/CZH401121558 — a six-check JSON result.
Oboe Concerto in B-Flat Major, Op. 9 No. 11: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b364f123118c1a8bd7e7ed8b432057642aa883bbfef430f8a126ba90657dc93. 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/CZH401121559 — a six-check JSON result.
Oboe Concerto in B-Flat Major, Op. 9 No. 11: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a6d201ddf1b6fc9abdcf4d1905a038fbdec6c7a2b40b4427ac6b7decca09859. 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/CZH401121560 — a six-check JSON result.
Oboe Concerto in D Major, Op. 7 No. 6: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fcbfcbe89c02bb501da6fee795ea71b2b2562380cad7d7f4294a29a52454ea2. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/CZH401121561 — a six-check JSON result.
Oboe Concerto in D Major, Op. 7 No. 6: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b71dd56d7ec64e81715192f9fdf087ee1b0977d9dc01de931043e887c51739. 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/CZH401121562 — a six-check JSON result.