Ensemble Recherche is a German contemporary classical music ensemble with nine fixed members. Founded in Freiburg im Breisgau in 1985, the ensemble has premiered more than 1,000 works, dozens of which
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3761659d1b1c1954fd7b6c70f236c5e39776d326c132adfb3c83e55bcd3ae30. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/47c44259-8f80-4f46-86de-fe8d1f332abe.json and https://artists.proofprofile.net/proofs/artist/47c44259-8f80-4f46-86de-fe8d1f332abe.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hugues Dufourt: L'Afrique d'après Tiepolo - L'Asie d'après Tiepolo
Neue Musik kommentiert: Einführung in die Neue Musik
Widmann, Smolka, Czernowin, Andre, Zender & Riehm: Liebeslieder
IN NOMINE: The Witten In Nomine Broken Consort Book
In Nomine (2001) for bass flute, english horn, clarinet, piano, vibraphone, violin, viola and Violoncello
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f1222d76761a296702bd99434e2371d1db5d19c216c69701079b3fc19212dd6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940524435.
In Nomine-Instrumentation colorée I (2001) for flute, oboe, bass clarinet, percussion, piano, violin, viola and Violoncello
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17c46e95aebe1d1dd0e5a0c0d03c29338b4efa1a7e51d52f10ca749525f32969. Chain 2 (Bitcoin): anchored in block 960223 (2026-07-30T07:51:46Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940524401.
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
Salvatore Sciarrino: Sui poemi Concentrici
Márton Illés: Watercolors and Psychograms
Three Watercolors for Clarinet (2014): I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4677dc331cab2e07907631b2f346c075a51fc15d2feec16b1b093aa0c015b74e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK941506601.
Canon 2a, Lustig spielend, aber nicht zu lustig, immer ein bißchen melancholisch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa24f122cc67bff08ce1c2e424d4d5a7e87eb3d47f9ad92fd6d08b0b2a35e23ae. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA290900070.
Morton Feldman: Something Wild - Music for Film
Something Wild in the City: Mary Ann's Theme (1960) for horn, celesta, and string Quartet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d58b9e5a7541b66b1ebe30098f5c4db476f38c194b4afb155aedc6dee014e5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222901.
Jackson Pollock (1950-51) for two Cellos: V Painting on Glass
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c7986029d196a3cc2c55ad2bdca5485e5d288405146d145b56efe2bc3e8a4a1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222907.
Jackson Pollock (1950-51) for two Cellos: VI Painting on glass (2nd Sequence)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb333ac301c870e1f3ffbe438c209e9edbc8f1e838f5f3b227f6bf6c6777591af. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222908.
Samoa (1968) for flute, horn, trumpet, harp, vibraphone, piano, and Cello: I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c00888637369795c5711e8e58c0f0e458f3355043f2f6b111023a81f1008c7a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222909.
Samoa (1968) for flute, horn, trumpet, harp, vibraphone, piano, and Cello: II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55183e5f1f4c8c8ca7e81834efa2d610e88219b21ee712b98ffe6babdf722c9. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222910.
Samoa (1968) for flute, horn, trumpet, harp, vibraphone, piano, and Cello: III
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282d6e4a074b5fd04fffa00621ff23f5a0a861a4729939f66aa798d613205e94. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222911.
Samoa (1968) for flute, horn, trumpet, harp, vibraphone, piano, and Cello: IV
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0427140118fe96d4f3adbd6ba73a71e365cae815f1cbfa043396afead66d11. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222912.
Samoa (1968) for flute, horn, trumpet, harp, vibraphone, piano, and Cello: V
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4535fbd3808291c2ada52fdf30d3910e97eb5d7b4498a8b17c4f0b6294a142bf. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b684b27fcda9df5be9b3b668e3978967026e78627130fe20e62378a78bde66. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222914.
The Sin of Jesus (1960-61) [Score for untitled film] for flute, horn, trumpet, and Cello: A
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72f7356494b2ba692fb63ad8774edb60e549646e93bbe0e708f401bcb48c57f. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222916.
The Sin of Jesus (1960-61) [Score for untitled film] for flute, horn, trumpet, and Cello: Cue II, very Soft
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcced7f80bc0163105380e543d87bd4e26079db69d2366528835322b73c5147cd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222917.
The Sin of Jesus (1960-61) [Score for untitled film] for flute, horn, trumpet, and Cello: Cue IV - IV A, very Soft
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a9cb71783f3ce3b482047fb29d839dde7309132097bd959f7961e4d0261e78. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222919.
The Sin of Jesus (1960-61) [Score for untitled film] for flute, horn, trumpet, and Cello: Cue V Solo Cello
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x631003d7f2a3977c265d01a7b809fcdcbdc56e104ab30722edd0ca2cabdc85b0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222920.
[Untitled film music] (1960) for flute, horn, trumpet, trombone, tuba, percussion, and double Bass: Intro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x372e4f4e05deaf0ebe51792aeb5b6474c16c8c5f0345dd9dd6256e8958dcdefe. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222923.
[Untitled film music] (1960) for flute, horn, trumpet, trombone, tuba, percussion, and double Bass: City
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3290f9bf9834018e0f3918fffe3107357b03812779486de89760084b4665a73. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222924.
[Untitled film music] (1960) for flute, horn, trumpet, trombone, tuba, percussion, and double Bass: The Beach
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a7f35e81c0784b53d62ff4d91d2cb502a3409ed6cf78eecea91e522e57b59b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222930.
The Sin of Jesus (1960-61) [Score for untitled film] for flute, horn, trumpet, and Cello: Cue I - Cue III Ending at A
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa0b7a86136d3d07b97e6f1f960219e0ef5dcd30cc3f2f80c1dfe73340318627. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222915.
The Sin of Jesus (1960-61) [Score for untitled film] for flute, horn, trumpet, and Cello: Cue V A
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb5ac1e16fa0d1c78e4bbdc2bba435510a9cb1478673cd1460f6a046b9e77838. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222921.
The Sin of Jesus (1960-61) [Score for untitled film] for flute, horn, trumpet, and Cello: Cue VI
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e505f937b7d0de0b0e09b785cc4a759d99fdc6ea5622b35531d40fd3bfe6b1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222922.
[Untitled film music] (1960) for flute, horn, trumpet, trombone, tuba, percussion, and double Bass: Theme
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33fd899602ccd3dc00a24610121e7c0c87a7ea1d5eb18c3098d0f1402f535494. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222927.
[Untitled film music] (1960) for flute, horn, trumpet, trombone, tuba, percussion, and double Bass: The Park
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2333a76f3757c63f839a7b648512ca917ed756f5870eb7da92e0ae068071bfe9. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222929.
[Untitled film music] (1960) for flute, horn, trumpet, trombone, tuba, percussion, and double Bass: Desert
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c44515cccc86671471f2601880f7727beed107f7b2bffdc49b62a1ccb649c37. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222932.
De Koonig (1963) for horn, percussion, piano/Celesta, violin and Cello
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbb2ac61ee2a7c880d0b89cb66d39dc6e4d7cddf9257cd1ea87e430dae30628. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222933.
Lo spazio inverso (1985) for flute, clarinet, celesta, violin and Violoncello
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1cafbf0e178fc081dc0b729904ee21b05ae16ae611ce19b1ad441c97b176ab. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940021301.
Wolfgang Rihm: Musik für drei Streicher (trio recherche)
Bernd Alois Zimmermann: Présence / Intercommunicazione
Fabien Lévy: De l'art d'induire en erreur
Danse polyptote (2013) for accordion and Cello - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e855f0767e592e76cfe0581b4b9e630da73a9128dd03bc41afa02f2b450762c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK942203706.
Durch, in memoriam G. Grisey (1998) for saxophone Quartet - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0788a464f3b0a5e513144451ab20338bd36a79b2b5b3459f34268a55daf011a1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK942203701.
À propos (2008) for flute, clarinet, violin, cello and Piano: I. Les automates intimes de Tim Hawkinson - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x606404caec1ea47ceebaf6169ff01256d6acca032345b82cb48566c2feed1487. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK942203702.
Feldman: Routine Investigations, The Viola in My Life, For Franck O'Hara, I Met Heine on the Rue Fürstenberg