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 0xabde3a6ce0411e01c8a469b2481bc5c02ddb58a875324f3d48e3f234bc04ba80. Chain 2 (Bitcoin): anchored in block 953888 (2026-06-16T04:55:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d047d54-880e-4dab-9141-ceacbe92012b.json and https://artists.proofprofile.net/proofs/artist/0d047d54-880e-4dab-9141-ceacbe92012b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Music For The Millions Vol. 19 - Antonio Vivaldi
Concerto For 2 Violins And Strings, " Per Eco " , A-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 0x3c57a6059da3fd0d1208ca824250766489ae8fff444c319555f59d0f51042c82. 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/DEA580601030 — a six-check JSON result.
Concerto For 2 Violins And Strings, " Per Eco " , A-Major: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd864cc1e4ce55e5bdea7d6c9d4d640c6a007977ef062c67a3117a65d4b9c016f. 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/DEA580601031 — a six-check JSON result.
Concerto For 2 Violins And Strings, " Per Eco " , A-Major: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f75150ddc0c34c4c386d328499b41d7af466b34a0536d4a20f38f99315a1201. 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/DEA580601032 — a six-check JSON result.
Concerto For 2 Flutes, C-Major, RV 533: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ded3cd01a063360ddf51874b06ed439e37511a255ead920e3e31aa11a419676. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEA580600651 — a six-check JSON result.
Concerto For 2 Flutes, C-Major, RV 533: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa604784592d77a12e2fe0d75ba5f788a2bc5f6a889f41569d15c1b1c03a2ba2. 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/DEA580600652 — a six-check JSON result.
Concerto For 2 Flutes, C-Major, RV 533: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe08151fbd98fb51cf04476e6ce2994a5032a80fa3f12b5b3a4755d9744eae9d7. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEA580600653 — a six-check JSON result.
Concerto For 2 Celli And Strings, G-Minor, RV 531g: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9c885c307915d6e9de2cadabf176284947edcacffe91d55181cee1828cf9cd. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/DEA580601813 — a six-check JSON result.
Concerto For 2 Celli And Strings, G-Minor, RV 531g: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7f0fdc27afd62910bd7ef5b88c42b0f94cedeb72e53b6c0ae93f06192f1e65. 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/DEA580601814 — a six-check JSON result.
Concerto For 2 Celli And Strings, G-Minor, RV 531g: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb7279db176b8eec45e8a46f8ca56ee41902293a42dfe67abd20deb1b821b9a. 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/DEA580601815 — a six-check JSON result.
Concerto, D-Major, For Strings And Organ, RV 124: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e9ff9bdf25df8d771ad2e826ea94d733165493f9d6870fa4a9d90115f4a09c6. 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/DEA580900357 — a six-check JSON result.
Concerto, D-Major, For Strings And Organ, RV 124: II. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d19d5ddf59ff0a8ead314d4efb33f877b93ee6f660893de93e1ae2dfb93e651. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DEA580900358 — a six-check JSON result.
Concerto, D-Major, For Strings And Organ, RV 124: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43369528d9ba9faf45151442590e276e5fa82cce22b7e3d6b2e7671a0c46bfdf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEA580900359 — a six-check JSON result.
Concerto, F-Major, For 2 Oboes, Bassoon, 2 Horns, Violin & Strings RV571: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bda313f6d6a2fd9c8c6a0265ab1ce8d7b764c094f5f4242c01ca35289f090bc. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/DEA580601102 — a six-check JSON result.
Concerto, F-Major, For 2 Oboes, Bassoon, 2 Horns, Violin & Strings RV571: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd85e45ea8fc04a9f86797ca0c456ae8bb26d1587ce09f9c89a542169ac3a44. 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/DEA580601103 — a six-check JSON result.
Concerto, F-Major, For 2 Oboes, Bassoon, 2 Horns, Violin & Strings RV571: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53f0bf78f182ca220660cd94e129266108bb0caf2adee32b3eb459b6e0b3dba5. 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/DEA580601104 — a six-check JSON result.
Concerto For Strings & Harpsichord, C-Major, RV 116: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c0166b89b4506b7562ead5d516a581ad8f27651585668c1b95460c21e22e8c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEA580800482 — a six-check JSON result.
Concerto For Strings & Harpsichord, C-Major, RV 116: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80594ab864240c14dcf9bc7e0cf39f90b53e297e7b7094230c8bf160c3c17227. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEA580800483 — a six-check JSON result.
Concerto For Strings & Harpsichord, C-Major, RV 116: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ca3b46350b4847caf24347f488f9cbcc1be3ae5bc04d6d92636298ac465e4c3. 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/DEA580800484 — a six-check JSON result.
L'estro armonico No. 8, A-Minor, RV 522, op. 3: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a9eefc775a2227f8200d6a2b4e29cb0c9a442df8b2efd85331c19c2eef44ebf. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEA580600890 — a six-check JSON result.
L'estro armonico No. 8, A-Minor, RV 522, op. 3: II. Larghetto e spiritoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592cf2e72db42dbea70d8da753346c2e53069a15f09c3f289fb0353dccd8c110. 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/DEA580600891 — a six-check JSON result.
L'estro armonico No. 8, A-Minor, RV 522, op. 3: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa38ec04a67636c6a36aa8913867e68270835c54b3700814dde147d2be84339db. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEA580600892 — a six-check JSON result.
Music For The Millions Vol. 20 - Piotr I. Tchaikovsky
Concerto for 2 Violins and Strings in A Major "Per Eco": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f75150ddc0c34c4c386d328499b41d7af466b34a0536d4a20f38f99315a1201. 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/DEA580601032 — a six-check JSON result.
Concerto for 2 Cellos in G Minor, RV 531
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7f0fdc27afd62910bd7ef5b88c42b0f94cedeb72e53b6c0ae93f06192f1e65. 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/DEA580601814 — a six-check JSON result.