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 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 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-Instrumentation colorée I (2001) for flute, oboe, bass clarinet, percussion, piano, 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 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 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.
In Nomine (2001) for bass flute, english horn, clarinet, piano, vibraphone, violin, viola and Violoncello
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.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc47359e764ed6369ce38692a6cd9d3cf9996f98f7484927ca42232d24ce3dfd. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR46Y0106101.
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 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/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 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/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: II Pollock Paints
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660defbaa89b7ea4f59efcb6e2eac34824f59d9a891f03fba90410c81469c906. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/ATK940222903.
Jackson Pollock (1950-51) for two Cellos: IV Detail of Paintings
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x013800a6808a40521fb1364a4bfd45ec7cb15a83ddbe27eb60739fc95119436a. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ATK940222905.
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 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/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 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/ATK940222913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b684b27fcda9df5be9b3b668e3978967026e78627130fe20e62378a78bde66. 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/ATK940222914.
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: A
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72f7356494b2ba692fb63ad8774edb60e549646e93bbe0e708f401bcb48c57f. 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/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 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/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 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/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.
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: 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: 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: The Beach
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a7f35e81c0784b53d62ff4d91d2cb502a3409ed6cf78eecea91e522e57b59b. 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/ATK940222930.
[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 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/ATK940021301.
Wolfgang Rihm: Musik für drei Streicher (trio recherche)
Bernd Alois Zimmermann: Présence / Intercommunicazione
Fabien Lévy: De l'art d'induire en erreur
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.
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.
Feldman: Routine Investigations, The Viola in My Life, For Franck O'Hara, I Met Heine on the Rue Fürstenberg