thumb|Hardenberger in 2021, News Øresund, Malmö, Sweden Ulf Håkan Hardenberger (born 27 October 1961) is a Swedish trumpeter, conductor, and professor at the Malmö Academy of Music. Early life Hard
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 0x8798b6f9001a78753c3317106599d275205cb10ec4c563aa7a9ab21e81f25a6f. 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/150c9c66-4ffc-49eb-9c1d-c35db59a2ec6.json and https://artists.proofprofile.net/proofs/artist/150c9c66-4ffc-49eb-9c1d-c35db59a2ec6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Dean: Dramatis personæ - Francesconi: Hard Pace
Zimmermann: Cello, Oboe and Trumpet Concertos; Canto di speranza
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 0x92aa00f6d845ed70847dc760b3d8199e130c53c36b4380221bf925866b5c4de8. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLA508643006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a14be3567614b8b97f54c2b727abbe52fcef3954c6e80616731efbd3b21ea0. 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/NLA508643007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x000c9ee8d3283c123414aeb5fa1f4485734ba98486122b68eecbfbdeaebc4d9d. 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/NLA508643008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5517cf8a5ec804c62e79aff8c0a28cbe4a0df68e881776dfd30940cf6a53e1d2. 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/NLA508643009.
Concerto for 2 Trumpets, Strings and Continuo in E flat: 1. Maestoso
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Concerto for 2 Trumpets, Strings and Continuo in E flat: 2. Allegro
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Concerto for 2 Trumpets, Strings and Continuo in E flat: 3. Grave
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Concerto for 2 Trumpets, Strings and Continuo in E flat: 4. Vivace
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Concerto No. 2 for Trumpet, 2 Oboes, Strings and Continuo in D: 1. Largo
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Concerto No. 2 for Trumpet, 2 Oboes, Strings and Continuo in D: 3. Siciliano
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Concerto No. 1 for Trumpet, 2 Oboes, Strings and Continuo in D: 2. Grave
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Trumpet & Organ Spectacular at Sorø Church
Holloway: Solo Trumpet Sonata / Gruber, H.K.: Exposed Throat / Ruders: Reveille - Retraite
20th Century Recordings: Orchestral Music
Academy of St Martin in the Fields: Baroque Landscapes
Ligeti: Volumina; Organ Study No.1; Three Pieces for Two Pianos; Aventures; Nouvelles Aventures; Mysteries
Birtwistle, Maxwell Davies & Watkins: Trumpet Concertos
Trumpet Concerto in E-Flat Major, Hob. VIIe:1: III. Rondo. Allegro
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b5f343a412e672c3bdb27f4a8bc425c681317f530748dbfbefc008570169082. 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/GBF079042701.
Tomasi, Jolivet & Others: French Trumpet Concertos
Gruber: 3 MOB Pieces - Busking - Schwertsik: Divertimento Macchiato
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aacd990420cfdfcf77f255ff29ccfc785b21198d8968b3ef17798fba90afdf9. 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/SEAES1214020.
Babes in Arms: My Funny Valentine (Arr. T. Stevens)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02a0e334a7e207dedef2d9dab585fc2aaaa8f97140168063b21fed354bfa26e. 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/SEAES1214040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8091df9b6c66db65f98ae0a7c86b99a59b833294c8a3b71e094f6e252859dec7. 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/SEAES1214070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9204b94d0cb7089dff7f9a704c7ab736b473c216ceac5f3034e347bfd74492. 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/SEAES1214080.
The Mission: Gabriel's Oboe (Arr. T. Brostrom)
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The Godfather: Waltz - Love Theme (Arr. T. Brostrom)
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Mozart & Wagner, with Hardenberger’s Gruber
Gruber / Eötvös / Turnage: Trumpet Concertos
Martinsson / Part / Tamberg: Trumpet Concertos
Hakim: Trumpet Sonata / Jansen: Processional / Constant: Alleliuias...
Bortz / Sandstrom / Rabe: Swedish Trumpet Concertos
Concerto in D minor, S. Z799: 1. Andante e spiccato
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf3d88695688e6cb5a9d71387309d3f245e8ed9f96afa2b11f798892b99edb85. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/NLA508723002.
Haydn, Hummel, Hertel & Stamitz Trumpet Concertos
Trumpet Concerto in E flat major: 3. Rondo
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Trumpet Concerto in D: 1. Allegro ma non troppo
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a4dfd3d5f2ebc6d30d5baac2022413cf2021812b8c1bdce6cfd30cf0426f23d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLA508640912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa19b264ded5772b5090d71a4fbbbd43c6e0f00cbe22801f3474841c341d3fc. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:48:47Z), 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/SEAEC8587100.
Haydn/Hummel/Richter: Virtuoso Trumpet Concertos
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Serenade for Strings, Op. 48: II. Waltz. Moderato
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Water Music Suite No. 1 in F, HWV 348: 3a. Allegro
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Má Vlast (My Country): 2. Vltava (The Moldau)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563c4e3dc8ed69711cea2537844d716c117b1aca9cc2ffa1fa0f4ac0fbd94f0b. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NLA507510008.
Humoresque in G Flat Major, Op.101, No.7, B. 187
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Serenade in G Major, K. 525 "Eine kleine Nachtmusik": 1. Allegro
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"Madrigalesco" and other works - Vivaldi