thumb|269x269px|The KOMED building at MediaPark 7 in Cologne, where Ensemble Musikfabrik is based. The Ensemble Musikfabrik (music factory ensemble) is an ensemble for contemporary classical music loc
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 0xdcb91c366340007808aa4af9807be3eee3a0c8c4a6a3d30802e0cded22c2a061. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c1e8413f-26f7-4a23-ab2b-47f21ffe7001.json and https://artists.proofprofile.net/proofs/artist/c1e8413f-26f7-4a23-ab2b-47f21ffe7001.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Outlines of the Night (2023) for Ensemble
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 0xb7b4afbc1021702b586dbf4a9188bd8f00646a85130910904c174dff830ecb9a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ATK942201902 — a six-check JSON result.
Simone Santi Gubini: The Black Exposition
Fleisch für Tenorsaxofon, E-Gitarre, Keyboard und Drumset: I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebfa4c42284eccc6bbbdb91fddad914e102a82e47c59b701caeb4620684e1020. 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/DEC442211142 — a six-check JSON result.
Prozession für großes Ensemble: I. Takt 1 ff
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xceefb45a464ed5e5657ef08e0542176503c4873421af5d2bc9c63c3be4a3569b. 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/DEC442211145 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2bc0d33fa57236bb4c33dfa2ffdddb0106580b7ff096e02d389863ae06ffd9e. 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/NLNF32300006 — a six-check JSON result.
Harry Partch: Delusion of the Fury. A Ritual of Dream and Delusion
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a69c6cecc1f138bcd3b4b78a045b79cd734ab1fad1f1f9ff257ebbb5b75c505. 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/DEC442211066 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fb0f79195bd71e3c1fb64e6fd833ec318f2bf28e337076aa92fa72c174b4096. 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/DEC442211067 — a six-check JSON result.
Kurtág: Rückblick (Altes und Neues für 4 Spieler - Hommage à Stockhausen)
FinisTerrae: Sounds from the End of the World (Contemporary Music from Chile)
Edition Musikfabrik, Vol. 13 – Kreuzungen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aad91d0fdc13c08ced99e63ec5a6e6f993d774248495daa83ad0af89079e880. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/DEC441709633 — a six-check JSON result.
Toshio Hosokawa: Voyage VIII / Voyage X Nozarashi / Stunden-Blumen / Arc Song / Lied
Birtwistle: Secret Theater - Ritual Fragment - Nenia: The Death of Orpheus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab2a170171fb2854955c43b36c8a44ff34c2f3a2e047f236d40de6e04541e25c. 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/DEB200416909 — a six-check JSON result.
Edition Musikfabrik, Vol. 07 - Unerwartet
Edition Musikfabrik, Vol. 06 - Nach Innen
Edition Musikfabrik, Vol. 04 - Schattenspiele
Edition Musikfabrik, Vol. 03 - Vom Himmel zur Hölle
Edition Musikfabrik, Vol. 02 - Sichtbare Spuren
Edition Musikfabrik, Vol. 01 - Sprechgesänge
Ligeti: Lux aeterna / Heppener: Im Gestein
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36a8f95c40366af6913aaed265f06cbd1108013cc535addb335c1ea46c12eb4. 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/FRZ140715010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93451fb90a8ecb865b9546835519a2dded325e7a87fc0b514062195efb31048a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRZ140715020 — a six-check JSON result.
Drei Phantasien nach Friedrich Hölderlin: I. Hälfte des Lebens
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612f4138300760414e5a0cbceb5ef653ad76937ad3f4d2975062e1ad9d6b687e. 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/FRZ140715040 — a six-check JSON result.
Drei Phantasien nach Friedrich Hölderlin: II. Wenn aus der Ferne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e01b5934b8a1e393d4c1871597fcdf26c509e3798c8f5a1abe227662805bab. 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/FRZ140715050 — a six-check JSON result.
Drei Phantasien nach Friedrich Hölderlin: III. Abendfantasie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46610676ab7eeffe4db2ae0916d976c582eccb0adab2da48f03664c21a5d4dda. 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/FRZ140715060 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x399b959ad1f873fd0eed128aafeb57f8ff231cc77614e0456ff8808d2a74942a. 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/FRZ140715080 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12594393f4604dc0377ea3901937af6a7eb484c2e4209453900ded82fddffa10. 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/FRZ140715090 — a six-check JSON result.