1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 artist was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f224be9a9e51ef07a32b6eab77b1d47f2ce08e88985c8dddf6c09100f737ce. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0fa45d4-6780-4984-962a-4ae91eb541e7.json and https://artists.proofprofile.net/proofs/artist/b0fa45d4-6780-4984-962a-4ae91eb541e7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Clemens Hagen + 1b1: Haydn Cello Concerto in C, Mozart Sinfonia Concertante
Concerto for cello and orchestra in C major, Hob VIIb: I. Moderato
Concerto for cello and orchestra in C major, Hob VIIb: II. Adagio
Concerto for cello and orchestra in C major, Hob VIIb: III. Allegro molto
Sinfonia Concertante in E-flat major, K 364: I. Andante maestoso
Sinfonia Concertante in E-flat major, K 364: II Andante
Sinfonia Concertante in E-flat major, K 364: III Presto
Bach & Telemann Concertos for Viola & Bassoon
Concerto in E-flat Major for Viola, Strings and Basso Continuo, reconstruction based on BWV 169, 49, 1053; I Allegro
Concerto in E-flat Major for Viola, Strings and Basso Continuo, reconstruction based on BWV 169, 49, 1053; II Siciliano
Concerto in E-flat Major for Viola, Strings and Basso Continuo, reconstruction based on BWV 169, 49, 1053; III Allegro
Concerto in D Minor for Bassoon, Strings and Basso Continuo, reconstruction based on the fragment BWV 1059; I Allegro
Concerto in D Minor for Bassoon, Strings and Basso Continuo, reconstruction based on the fragment BWV 1059; II Adagio
Concerto in D Minor for Bassoon, Strings and Basso Continuo, reconstruction based on the fragment BWV 1059; III Allegro
Concerto in C Minor for Bassoon, Viola, Strings and Basso Continuo, Reconstruction based on the version for Violin, Oboe, Strings and Basso Continuo, BWV 1060; I Allegro
Concerto in C Minor for Bassoon, Viola, Strings and Basso Continuo, Reconstruction based on the version for Violin, Oboe, Strings and Basso Continuo, BWV 1060; II Adagio
Concerto in C Minor for Bassoon, Viola, Strings and Basso Continuo, Reconstruction based on the version for Violin, Oboe, Strings and Basso Continuo, BWV 1060; III Allegro
Concerto in G Major for Viola, Strings and Basso Continuo; I Largo
Concerto in G Major for Viola, Strings and Basso Continuo; II Allegro
Concerto in G Major for Viola, Strings and Basso Continuo; III Andante
Concerto in G Major for Viola, Strings and Basso Continuo; IV Presto
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; I Avec douceur
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; II Gay
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; III Largo
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; IV Vivement
Recorder Concerto in C Major, RV 443: I. Allegro
Recorder Concerto in C Major, RV 443: II. Largo
Recorder Concerto in C Major, RV 443: III. Allegro molto
Chamber Concerto in A Minor, RV 108: I. Allegro
Chamber Concerto in A Minor, RV 108: II. Adagio
Chamber Concerto in A Minor, RV 108: III. Allegro
Recorder Concerto in F Major, RV 442: I. Allegro ma non molto
Recorder Concerto in F Major, RV 442: II. Largo cantabile
Recorder Concerto in F Major, RV 442: III. Allegro
Recorder Concerto in C Major, RV 444: I. Allegro non molto
Recorder Concerto in C Major, RV 444: II. Largo
Recorder Concerto in C Major, RV 444: III. Allegro molto
Recorder Concerto in A Minor, RV 445: I. Allegro
Recorder Concerto in A Minor, RV 445: II. Larghetto
Recorder Concerto in A Minor, RV 445: III. Allegro
Chamber Concerto in D Major, RV 92: I. Allegro
Chamber Concerto in D Major, RV 92: II. Adagio
Chamber Concerto in D Major, RV 92: III. Allegro
Recorder Concerto in C Minor, RV 441 (Rev. ed. D. Laurin): I. Allegro non molto
Recorder Concerto in C Minor, RV 441 (Rev. ed. D. Laurin): II. Largo
Recorder Concerto in C Minor, RV 441 (Rev. ed. D. Laurin): III. Allegro
Holberg Suite (for string orchestra), Op. 40; I Prelude
Holberg Suite (for string orchestra), Op. 40; II Sarabande
Holberg Suite (for string orchestra), Op. 40; III Gavotte. Musette
Holberg Suite (for string orchestra), Op. 40; IV Air
Holberg Suite (for string orchestra), Op. 40; V Rigaudon
Holberg Suite (for piano solo), Op. 40; I Prelude
Holberg Suite (for piano solo), Op. 40; II Sarabande
Holberg Suite (for piano solo), Op. 40; III Gavotte. Musette
Holberg Suite (for piano solo), Op. 40; IV Air
Holberg Suite (for piano solo), Op. 40; V Rigaudon
Skomsvoll's Holberg Variations (recompimprovariations); I Praeluderies
Skomsvoll's Holberg Variations (recompimprovariations); II Sarabond
Skomsvoll's Holberg Variations (recompimprovariations); III Gavotterized
Skomsvoll's Holberg Variations (recompimprovariations); IV Airsm
Skomsvoll's Holberg Variations (recompimprovariations); V Rigandarchy