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 0x1b99dfee79f6f332f786aae7b036680e90e4504c1226036b3e50c1c11607c1a5. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8302324c-c1ba-427f-9795-d4cc0b25c4bc.json and https://artists.proofprofile.net/proofs/artist/8302324c-c1ba-427f-9795-d4cc0b25c4bc.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
St. Matthew Passion, BWV 244: Pt. I: No. 1, Chorus. Kommt, ihr Tochter, helft mir klagen (Chorus, Soprano in ripieno)
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 0xd1f74062cf37ed5415f86ee2223a906e3983f5c1a5d0f352b595b178df1b491e. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKI190584401 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 2, Recitative. Da Jesus diese Rede vollendet hatte (Evangelist, Jesus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e88680a51c839fcb0a623ca7a53ad47f8b148ebb3fb693364a2c92379e077ce. 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/HKI190584402 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 3, Chorale. Herzliebster Jesu, was hast du verbrochen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd027caa47479dee8c78d074996d521b6accd5d94121381caf35f714508a3f11f. 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/HKI190584403 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 4, Recitative and Chorus. Da versammleten sich die Hohenpriester (Evangelist, Chorus, Jesus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x897b6960e766f37be375054771fe6bad240df92b5a650be6871f05d1a10bcae5. 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/HKI190584404 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 5, Recitative. Du lieber Heiland du (Alto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7559eea8af6facea71ac072129ddcd2cfd86c9bf063fc5493c4821de82cca636. 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/HKI190584405 — a six-check JSON result.
Matthäuspassion, BWV 244: Aria. Buß und Reu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39b6e1baa00bed7438b47b0a1d2a4c309b9e21d8df28e088255aba7681f8bec8. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/HKI190584406 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 7, Recitative. Da ging hin der Zwolfen einer (Evangelist, Judas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a54dbf4f5a014e1c3008ea109096bac6dcaa82073e63cc149bd2b1dfca6e886. 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/HKI190584407 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 8, Aria : Blute nur, du liebes Herz (Soprano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5c8499710064671eb878e85c48a7d096b38f194aae99a0fe5bb19d462d96f96. 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/HKI190584408 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 9, Recitative and Chorus. Aber am ersten Tage der sussen Brot (Evangelist, Chorus, Jesus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42237b1e875d181bce6d581d5ae09f18b37481550549e28f764c0a0a6de1e385. 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/HKI190584409 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 11, Recitative. Er antwortete und sprach (Evangelist, Jesus, Judas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30690ebd85694c4a57d6f56c76c163a7e37700e96a08d156fc90e0ca292d34d9. 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/HKI190584411 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 12, Recitative. Wiewohl mein Herz in Tranen schwimmt (Soprano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac3a3a31ce8c7c5d1ed7231c966693f78f7777b03156b36473c1acfd04788617. 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/HKI190584412 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 13, Aria. Ich will dir mein Herze schenken (Soprano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa230162e926c0c84f195eb27a1d5a4d3325fb6b3bb35aff973162a54169d4b32. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/HKI190584413 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 14, Recitative. Und da sie den Lobgesang gesprochen hatten (Evangelist, Jesus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5246088030d97e6f15189c007717fdcfd035a89c0f63902c360f0b0b3f3130ce. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKI190584414 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 15, Chorale. Erkenne mich, mein Huter
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351bda4cfb6afbb968e7e547f12eda319349b442adfef86ed7aff8dd72944be5. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKI190584415 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 18, Recitative. Da kam Jesus mit ihnen zu einem Hofe (Evangelist, Jesus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4582d24a59715ee138c54d5dca6f777d0a097ef1add10647caa35b0c25558c3. 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/HKI190584418 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 19, Recitative and Chorale. O Schmerz, hier zittert das gequalte Herz (Tenor)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45aed8333ded0cd82995c40779abc7f7cb870496511d98e39544396c5ad81b6d. 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/HKI190584419 — a six-check JSON result.