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 0xe6a3a810108198832f6279681e5ca96cf2a1180684c020e77126389e1b37215b. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/55d2b4db-1c91-4ae2-aecc-16d2dfe5e480.json and https://artists.proofprofile.net/proofs/artist/55d2b4db-1c91-4ae2-aecc-16d2dfe5e480.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Trumpet Sonata in D Major, Z. 850: 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 0x0ee6f0df9e3c9e7cd4e781c5a5a038acd3d3ac1d0a96ef630d8d6c96277e0897. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/DEB261801021 — a six-check JSON result.
Trumpet Sonata in D Major, Z. 850: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e3512faed4d43e4b358a3c63e10d23c065b68fac148e19d1b0f0d2b2b14a8ef. 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/DEB261801022 — a six-check JSON result.
Baroque Trumpet Gala - Biber, H.I.F. Von / Telemann, G.P. / Handel, G.F. / Vivaldi, A. / Endler, J.S. / Stolzel, G.H.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8203dee6581731099e565d1327a3b82819f64a5fb1fe5b4fd07edadd465a719. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEC290245407 — a six-check JSON result.
Concerto for 2 Trumpets in C Major, RV 537: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x210a467c86eec88be51a6f53a636a8644990ea7158b953d4bc9cc3d2bda6aa0d. 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/DES380610007 — a six-check JSON result.
Concerto for 2 Trumpets in C Major, RV 537: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9994eb49ba6406eda6a80ade462ccb903463668c88fae21daa52a76d6244ac90. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DES380006859 — a six-check JSON result.
Concerto grosso a 4 chori in D Major: III. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8646a9f6c47bf7be39edd2b49e318cace07bd6334891118d7f2a94d7810212. 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/US37B0601698 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 1, Chorus. Kommt, ihr Tochter, helft mir klagen (Chorus, Soprano in ripieno)
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.
Matthäuspassion, BWV 244: Aria. Erbarme dich
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643f41f68ab9666cc4438352a9cca71e07fec49573af24376c024bf60481895a. 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/HKI190584510 — 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. II: No. 40, Chorale. Bin ich gleich von dir gewichen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafbeb3b98cd3dbfbfab138c621214be9870aef9c6aed708f47478300f60782a0. 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/HKI190584511 — 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. II: No. 44, Chorale. Befiehl du deine Wege
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c0230e14bc89d6b5cb59cc3081c0d3fefafb347c3d612a4b61ceb0bbdb1727. 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/HKI190584515 — 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.
St. Matthew Passion, BWV 244: Pt. I: No. 20, Aria and Chorus. Ich will bei meinem Jesu wachen (Tenor, Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e8eadcd3f72b2e480aa6cc66a2fba3b26afa3dce398e967d585a38683cd5625. 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/HKI190584420 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 22, Recitative. Der Heiland fallt vor seinem Vater nieder (Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4ef9106fa47ac9ec9c39c926f2f622573f41da07b91ef424757506baf921f8. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/HKI190584422 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 23, Aria. Gerne will ich mich bequemen (Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1e6b454d26eb869c1959389aaa71d1a9695423d28a7984d6586865401597f9. 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/HKI190584423 — a six-check JSON result.
Matthäuspassion, BWV 244: Chorale. Was mein Gott will, das g'scheh allzeit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6774342f58ebf076f4154e6b90b66ec3d5ba0f2f1396a8ac2c3630956b653bf. 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/HKI190584425 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 26, Recitative. Und er kam und fand sie aber schlafend (Evangelist, Jesus, Judas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec1fccab334cad2e4013f8fb9d332e4bfa5c4878ab241f06207c01fcefa36b76. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/HKI190584426 — a six-check JSON result.
Matthäuspassion, BWV 244: Duet. So ist mein Jesus nun gefangen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5356fc8617c914b18a711299331c770bf89f96d2de16e10c143c7cf526c43c77. 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/HKI190584427 — a six-check JSON result.
St. Matthew Passion, BWV 244: Pt. I: No. 29, Chorale. O Mensch, bewein dein Sunde gross
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23e3509e7dd437eda54ba41d201015463b4c49cc4561588efa5cdb70c34ebcc1. 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/HKI190584429 — a six-check JSON result.
Biber, Telemann, Handel, Vivaldi, Endler, & Stolzel: Baroque Trumpet Gala