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 0x4ab52b88d35faa8c8d36686898f38a0b3005efd9b29b86859a17df9c6700b4fe. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d648155f-9424-475b-abd3-c46a9420de47.json and https://artists.proofprofile.net/proofs/artist/d648155f-9424-475b-abd3-c46a9420de47.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
"Quel fior che all'alba ride" (Duetto XV), HWV 192
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 0x6a6aa1b62f88b99cefa999c94ff6383112cb6edd7c5d8ce471554a8269644389. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBF078011080 — a six-check JSON result.
"No, di voi non vuo' fidarmi" (Duetto XVI), HWV 189
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d91a69f2192c5e78569c8a8c36593ce86e4a6c6c213dc0665bdc836df466ac1. 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/GBF078011000 — a six-check JSON result.
The Alchymist, HWV 43: Minuet - Aire - Jigg
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacb87871c4bda114cfe5d86a9ef4e22bf6e91108c325f6e19b090d847e5fd454. 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/GBF078111574 — a six-check JSON result.
St. John Passion, BWV 245, Part I: Herr, under Herrscher (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc664493432829c1612a1c06ae6cc370ba23b898ce59a2ac30cf2d0ba1aec1274. 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/GBLWD9002101 — a six-check JSON result.
St. John Passion, BWV 245, Part I: Recitative. Jesus ging mit seinen Jungern (Evangelist, Jesus) - Jesum von Nazareth (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f45fc7ef711640eb26a583a258b31a783ac22d6b353c79f5b5e2ae5d4b7dd14. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBLWD9002102 — a six-check JSON result.
St. John Passion, BWV 245, Part I: Recitative. Die Schar aber und der Oberhauptmann (Evangelist)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x159c18593db22532d9fa44eb0c0aaac232cc127a4aaa1f70ffdfd14550b55166. 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/GBLWD9002106 — a six-check JSON result.
St. John Passion, BWV 245, Part I: Aria. Von den Stricken meiner Sunden (Alto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74b735897c9adeed7d9800fb5c350d115380fb48e6aa4d888d3588e97a7711f7. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/GBLWD9002107 — a six-check JSON result.
St. John Passion, BWV 245, Part I: Aria. Ich folge dir gleichfalls (Soprano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfec8d14d38642e534edc3eba604cd6ce52bbb9f79c93d36d4dd05f965480769. 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/GBLWD9002109 — a six-check JSON result.
Mozart: Mass No. 15 in C Major, K. 317 "Coronation Mass": II. Gloria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0694bf19b87c330e9c177ec902ca92d656bc8002773c4c599c03f7d2378766e5. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/DEC628800459 — a six-check JSON result.