The Bachchor Mainz is a mixed choir in Mainz, Germany, founded in 1955 by Diethard Hellmann who directed it for 30 years, focused on works by Johann Sebastian Bach and other Baroque composers. His suc
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 0x8607bc1b8b8abbba853d5c211c4ca39b125dc10d1b4afd208191be867a8b6429. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d05d8096-a7b2-4857-b8f4-0ad69ea4c7f1.json and https://artists.proofprofile.net/proofs/artist/d05d8096-a7b2-4857-b8f4-0ad69ea4c7f1.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x0c3aec78f387673b919c9f70252c0d512721c8e1da4ab058b6042df20807eba0. 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/DEE470800329 — a six-check JSON result.
Oratoirio de Noël, Op. 12: Récit et choeur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c9a43ed307343a9426ffeaf7e72c0b6fd2f3baecf9b5926f58b08d17a42d815. 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/DEE470800330 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9aa5f46d2b25f0b4b3ed8149905606f5195aa3d075735f7f007e04e8d74d797. 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/DEE470800331 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55dcb89116168b59e671bcd2ab0703b238bfefffd62c5979e0c9bb17f1d4644a. 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/DEE470800333 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9204016c336c034117d1d4353176f6fa7e6d9e2e6038ee4c9d9ee4fe641d6e2. 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/DEE470800334 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a996b793adb08d57c67a88baebde69cc60a5d73ffbb8479219fe4076a8e2f8. 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/DEE470800335 — a six-check JSON result.
Oratoirio de Noël, Op. 12: Quintette et choeur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316b64271c2302c4eeef2d6cce9ed6000be80841d72755456397f256c4fb5585. 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/DEE470800337 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6620d1f10a4f0daaa08dc3bef20b2e832007f80aca39a00141351830b74ca01. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/DEE470800338 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ee3babb7c439350c657453ee52e83acb2da5873d6470390e653c07b6ffabc9. 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/DEE470800341 — a six-check JSON result.
Bach, JS: Mass in B Minor, BWV 232: Kyrie eleison I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f31b4192d6efb126681bdcd248af900d29de9cf9192851d2b0f945a095361ad. 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/GBAYC0401685 — a six-check JSON result.
Bach, JS: Mass in B Minor, BWV 232: Kyrie eleison II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7315c953b04a4522d3d3a75180e9ff265bb69c58b1b94dfa98ea837b25b8a8d4. 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/GBAYC0401687 — a six-check JSON result.
Bach, JS: Mass in B Minor, BWV 232: Gloria in excelsis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba5bb741a68895cacd881c42d27a8dc39ad8518d36e6bd421f7dbd933034dcb1. 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/GBAYC0401689 — a six-check JSON result.
Bach, JS: Mass in B Minor, BWV 232: Et in terra pax
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955ce2bbe3431432ee8a214a5654dbafef9bf2cfdce160d2f708237b33fd223f. 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/GBAYC0401690 — a six-check JSON result.
Bach, JS: Mass in B Minor, BWV 232: Gratias agimus tibi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3390d205d32ada8f947444babebda6d0dcb67630916ddb39c326af14b8deb16. 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/GBAYC0401692 — a six-check JSON result.
Bach, JS: Mass in B Minor, BWV 232: Et incarnatus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e29366f4216d78e79e8df0ff40bbd81b62e9ec386ba730b10119f09ad0ab66. 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/GBAYC0401702 — a six-check JSON result.
Bach, JS: Mass in B Minor, BWV 232: Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0415010ab1809c6da800dc7d7b31bf5ca8bf2b18a50fe65d964167a52d429c. 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/GBAYC0401709 — a six-check JSON result.