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 0xca28554e450d677e427b9a84fbaeed9dc37a1481e1b25e2d424efd7ea53d79df. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/59407a32-99b8-4f16-9e11-f01232507555.json and https://artists.proofprofile.net/proofs/artist/59407a32-99b8-4f16-9e11-f01232507555.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Matthäus-Passion, BWV 244: No. 33 Evangelista/Testis I & II/Pontifex "Und wiewohl viel falsche Zeugen herzutraten"
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 0xe59cce5199b9abdfbf470f2ffa490be812d803164a0bf5bf6212440f5a773cbe. 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/CH1262001242 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Nun komm der Heiden Heiland, BWV 599
Johann Sebastian Bach: The Complete Works for Keyboard, Vol. 7: Orgelbüchlein, BWV 599-644 (with choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab9e542fb45423f6d8f980be6d721c021e74ef900113ff41d03a6a4f4534d8f. 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/FR7JM1934020 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Gott, durch deine Güte / Gottes Sohn ist kommen, BWV 600
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d94313491051d86da56835bfb4c1e087ac3965ea11f3c9bb1df508c65cfc6df. 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/FR7JM1934030 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Herr Christ, der einge Gottessohn / Herr Gott, nun sei gepreiset, BWV 601
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb48c4b5d9995b2c7da16834ddf7910be263434467316eb6a95407f5a151235db. 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/FR7JM1934040 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Lob sei dem allmächtigen Gott, BWV 602
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1902b2c800fbf4ab8c4be6847bb79cab77f421c6afa2536e78b451aeafa8e1d8. 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/FR7JM1934050 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Puer natus in Bethlehem, BWV 603
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79fb73f578987f2ff0d6a93dc09bbf476a7f1deaeae63494ad3a524358d7dd23. 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/FR7JM1934060 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Gelobet seist du, Jesu Christ, BWV 604
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd117c54226a4386cc6fb65fa4c0f836da5941b384fdf93c7a07153871056fdeb. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FR7JM1934070 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Der Tag, der ist so freudenreich, BWV 605
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adbc177e476be2989e26124c8880aca15a8591628b6b2ac0c8c46ea30243156. 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/FR7JM1934080 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Vom Himmel hoch, da komm' ich her, BWV 606
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb14117c538447d58cabf8340becfe5742a4fc0320026853aff7153b50aee696d. 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/FR7JM1934090 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Vom Himmel kam der Engel Schar, BWV 607
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2042154fcf5eab3c22e304ef7b991973c3bf66000050b65902aa60da60a9a68e. 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/FR7JM1934100 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: In dulci jubilo, BWV 608
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdf12f6e8246e0e30fc9ac705d380339fb895356a47547cc3eda843624e8156. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/FR7JM1934110 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Lobt Gott, ihr Christen, allzugleich, BWV 609
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e8f06ad5f8853ce53732db1ca86b3280c68dd2e9a17f3e27147e6c644006fc6. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FR7JM1934120 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Jesu, meine Freude, BWV 610
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b4a99e2c9ed729ed44b2aa29e03b600e4f115aa5d9376d3c595a5c4e867138. 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/FR7JM1934130 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Wir Christenleut' haben jetzund Freud, BWV 612
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab34daa9a37fb847613903201c15c7222d1f345292ff4d916c307b6f035610b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FR7JM1934150 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Das alte Jahr vergangen ist, BWV 614
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5372eea3203e709e6c835da16634488c87fd8e49a46b33b8ec692197b75ed937. 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/FR7JM1934170 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: In dir ist Freude, BWV 615
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd745f91226d82a548483efd255f6a35e6ef1539b8077e047e2d2c0c43a66ce3d. 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/FR7JM1934180 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Mit Fried' und Freud' ich fahr dahin, BWV 616
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1348761e2f6f67609eea193435198b4f515abf5c50d5532c8cc57e732e976b8e. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/FR7JM1934190 — a six-check JSON result.
Orgelbüchlein, BWV 599-644: Christe, du Lamm Gottes, BWV 619
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf7fb5d62d66a9e9667bb2b923e8c4fe25ce48314cb2bd447498d6a511980706. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/FR7JM1935020 — a six-check JSON result.