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 0x5834b11b5e4648490e918e6d3279eaf718c30decc33defb6d8d4b292ad5b5c63. 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/91822af4-19b0-4661-9cb5-3b0da94194fd.json and https://artists.proofprofile.net/proofs/artist/91822af4-19b0-4661-9cb5-3b0da94194fd.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Süddeutsche Orgelmeister, Vol. 5: Hans Leo Hassler
H. & J. Praetorius: Organ Music (Norddeutsche Orgelmeister, Vol. 6)
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 0xdec3e9d41696992db59c1a4a3e02742b4edd4931cccb3ac39ec95254066c7baf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEU921368001 — a six-check JSON result.
Fantasia Ut re mi fa sol la a 4, SwWV 263
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c2705b48dc0567cb65e4b6626ffc089725a1a21124baab1a867e4cf270d852. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEU921368002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x688c51e2d8ab4a61489bfe0224f724a2404b4041544fbd8a09175858def88b22. 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/DEU921368003 — a six-check JSON result.
Wir glauben all an einem Gott: Variation 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x755f113b310745832c9d8c9be470758ccae2e1cb811d0aedaa3d16776461f2bf. 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/DEU921368004 — a six-check JSON result.
Wir glauben all an einem Gott: Variation 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8fd24916cbdf01846cece75fa58ca134de5d514072e04b649263514c6838b2a. 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/DEU921368005 — a six-check JSON result.
Wir glauben all an einem Gott: Variation 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa06685584e537038daf13b87fd73ddfec37882c0362b1c0d4e0b9500300c0ca8. 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/DEU921368006 — a six-check JSON result.
Fantasia chromatica in Dorian mode, SwWV 258
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc740de1b0b9f6789009d4d2386ff41c180c1027121a3d3289938c2f9b6ef3d50. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DEU921368007 — a six-check JSON result.
Psalm 23, SwWV 310, "Mein Huter und mein Hirt": Variation 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc9008d7955c13a32d325c3a334e81141c261217015a178b29a410e975b4938c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEU921368008 — a six-check JSON result.
Psalm 23, SwWV 310, "Mein Huter und mein Hirt": Variation 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6937ebb9d7bd225379abd5f59608c019cc42fc040413e77d85bbc3d6bb5c9ff. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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/DEU921368009 — a six-check JSON result.
Psalm 23, SwWV 310, "Mein Huter und mein Hirt": Variation 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd996779dbd016aa0d5ae0fd9aed586c603e34dda1501c743533236631b687a9. 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/DEU921368010 — a six-check JSON result.
Allein Gott in der Hoh sei Ehr, SwWV 299: Varitation 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae827302429e04caa5f2f6b28fa687314b22c0aac53201bc68688900b209221. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/DEU921368011 — a six-check JSON result.
Allein Gott in der Hoh sei Ehr, SwWV 299: Varitation 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7916694bb5b323cdba5f935eaacefa8d5127f1cb4cf02894b01f06d25eeae04. 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/DEU921368012 — a six-check JSON result.
Allein Gott in der Hoh sei Ehr, SwWV 299: Varitation 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ef83c0f9b091a081a13559b06747e7643ac2e2b398a2d5fbf1c73ab49d0b13. 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/DEU921368013 — a six-check JSON result.
Allein Gott in der Hoh sei Ehr, SwWV 299: Varitation 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f886df861b87739d3647b0ca9888b3f7949751fbd68ad24913954ea44185ce. 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/DEU921368014 — a six-check JSON result.
Erbarm dich mein, o Herre Gott, SwWV 303: Variation 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308fe72f98883814c8471a5dc22a7960044009e2958fb7a98e2aa957ecad9eab. 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/DEU921368015 — a six-check JSON result.
Erbarm dich mein, o Herre Gott, SwWV 303: Variation 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5003f095bdbd52db278f7c3d3fb9246e1f35b1d9337492a2d26e0625b5e3486. 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/DEU921368016 — a six-check JSON result.
Erbarm dich mein, o Herre Gott, SwWV 303: Variation 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6c83ff21163f73bf1bbeec933b8e607014c0669eeaef0ccf69360f6779d45a. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEU921368017 — a six-check JSON result.
Erbarm dich mein, o Herre Gott, SwWV 303: Variation 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee6e90a0d78fd4370f528a326f06cd4731c9c1ffe4fdc30bcb5c8a96d9ebee16. 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/DEU921368018 — a six-check JSON result.
Erbarm dich mein, o Herre Gott, SwWV 303: Variation 5
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2121a4bdb4d618a56d2a183c592dbbb27a625a004ddeef8316270bc6a61a9f1. 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/DEU921368019 — a six-check JSON result.
Erbarm dich mein, o Herre Gott, SwWV 303: Variation 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9414ad535dd4f6d983c7c6ccc5984bdc180627c1be899ddb38be67ae9819ad. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/DEU921368020 — a six-check JSON result.
Puer nobis nascitur, SwWV 315, "Ons is geboren een kindekijn": Variation 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32f45aa9f0467e6576c5643ee5e7ce255f0efdb4aabd895501e5a1d7539f8ae2. 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/DEU921368022 — a six-check JSON result.
Puer nobis nascitur, SwWV 315, "Ons is geboren een kindekijn": Variation 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2d0576b27106efbba2efc9a5f196c94cb7946a4a42e138252eb2c0ea1b8c57. 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/DEU921368024 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf39348ca95fb473e58e55ab5a7d15c995bb218f8da751c72c585ec4b6f51a733. 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/DEU921368025 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341d5fb86213d6b05dfb4f36661ba48550345d1bbe5ecfa132822ed1e437be61. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/DEU921368026 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d39db1f1bb5bd5d01dec16d254b952f3c9ed85495026a7dfe2bcd8869044fe. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DEU921368027 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6820bf7ed112f94033d1c18d9af6d7c9ace4e45a1e4a251004bc5ded4f5e1f82. 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/DEU921368028 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697b5f408bf4967432f53e97a3960da6722515b3e00a307e58cdb76592b977a2. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/DEU921368029 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28361522d989034aae28d8afec34221ed51c7e97463cfc3254ba422bdc9e14d9. 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/DEU921368030 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d5748ec11d33288dac73d34dcbb13fe7d153b4317351177dac98c256760cda. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/DEU921368031 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x178cc9a8940c82053e658a5e961e956ea033d7b620214772c51904ce80f0ceb7. 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/DEU921368032 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd956fec7d1450d4452970b87510751ed01e2bd1302781f32b067005f6375e78. 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/DEU921368033 — a six-check JSON result.
Bruhns, N.: Complete Organ Works / Schildt, M.: Organ Works
Pachelbel, J.: Organ Music (Suddeutsche Orgelmeister, Vol. 3)
Muffat, G.: Apparatus Musico-Organisticus (Suddeutsche Orgelmeister, Vol. 2)
Lubeck, V.: Organ Music (Norddeutsche Orgelmeister, Vol. 1)
Kerll, J.C.: Organ Music (Suddeutsche Orgelmeister, Vol. 1)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ff408f734a7d205756dbf60f5e3b90de15560894743f0c6ea124d3d3fcebb4f. 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/DEP620100170 — a six-check JSON result.