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 entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8f8b3bb12cf85e4b2633090cc9f340a7ae4b29128a0158ec92280fa2f3d7fa0. Chain 2 (Bitcoin): anchored in block 954019 (2026-06-16T23:44:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35d3ed59-283b-4f08-9754-481d81ebdd74.json and https://artists.proofprofile.net/proofs/artist/35d3ed59-283b-4f08-9754-481d81ebdd74.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sommerfeldt: Orchestral and Chamber Music
From William Blake's Poetry, Op. 53: No. 1, The Fly
From William Blake's Poetry, Op. 53: No. 2, The Garden Of Love
From William Blake's Poetry, Op. 53: No. 3, The Little Vagabond
Two Stein Mehren Songs, Op. 34: No. 1, Star Rain
Two Stein Mehren Songs, Op. 34: No. 2, Metamorphosis
Sinfonia La Betulla, Op. 12: I. Allegro Risoluto
Sinfonia La Betulla, Op. 12: II. Adagio Elegico
Sinfonia La Betulla, Op. 12: III. Largo - Allegro Elegico
Sonata For Violoncello And Piano, Op. 76: I.
Sonata For Violoncello And Piano, Op. 76: II.
Sonata For Violoncello And Piano, Op. 76: III.
Sonata For Violoncello And Piano, Op. 76: IV.
Sonata Saxifraga For Solo Violin, Op. 69a: I.
Sonata Saxifraga For Solo Violin, Op. 69a: II.
Sonata Saxifraga For Solo Violin, Op. 69a: III.
Sonata Saxifraga For Solo Violin, Op. 69a: IV.
Spring Tunes, Op. 44: No. 1, Tune For The Flute
Spring Tunes, Op. 44: No. 3, Spring Morn
Spring Tunes, Op. 44: No. 4, Mountain Yearning
Spring Tunes, Op. 44: No. 5, Spring Play In The Hills
Three Dialogues For Clarinet And Bassoon, Op. 54: I.
Three Dialogues For Clarinet And Bassoon, Op. 54: II.
Three Dialogues For Clarinet And Bassoon, Op. 54: III.
Divertimento For Bassoon Solo, Op. 25: I.
Divertimento For Bassoon Solo, Op. 25: II.
Divertimento For Bassoon Solo, Op. 25: III.
Norwegian Landscape, Op. 5: I. Bridal March From Gudbrandsdalen
Norwegian Landscape, Op. 5: II. Goat Call
Norwegian Landscape, Op. 5: III. Bridal Song: Dressing The Bride
Norwegian Landscape, Op. 5: IV. Springar, A Dance From Bergen
Tre Muntre Viser, Op. 3, 1960, Vent Ikkje På Brev
Tre Muntre Viser, Op. 3, 1960, Even Kjerringdalt
Fra Tre Lyriske Sanger, Op. 6, 1967, Bånsull - So Ro Godt Barn
Fra Tre Lyriske Sanger, Op. 6, 1967, Kvitsymre
Fra Sanger, Op. 8, 1950, Bånsull, Op. 8, 1950
Fra Sanger, Op. 8, 1950, Fattig Er Mitt Liv, Op. 8, 1950
Fra To Hamsun-Sanger, Op. 26, 1972, Fløytestubb
Tre Naturstemninger, Op. 16, 1986, Til Deg
Tre Naturstemninger, Op. 16, 1986, Nattstemning
Tre Naturstemninger, Op. 16, 1986, Min Bregne
Fra Tre Lyriske Bilder, Op. 33a, 1946, Rev. 1972, Skjærgårdsø
Fra Tre Lyriske Bilder, Op. 33a, 1946, Rev. 1972, Sudlandsbrur
Hildring I Speil, Op. 48, 1976, Rev. 1982, Landskap Med Sne
Hildring I Speil, Op. 48, 1976, Rev. 1982, Ord Mellom Trærne
Hildring I Speil, Op. 48, 1976, Rev. 1982, Lyst Klirrende Vår
Hildring I Speil, Op. 48, 1976, Rev. 1982, Om Kjærlighet - Versjon For Sang Og Klaver
Mot En Verden Av Lys, Op. 34a, 1972, Stjerneregn
Mot En Verden Av Lys, Op. 34a, 1972, Metamorfose
Arnebergsanger, Op. 36, 1950, Rev. 1973, Portrett
Arnebergsanger, Op. 36, 1950, Rev. 1973, Koral
Arnebergsanger, Op. 36, 1950, Rev. 1973, Skog
From William Blake's Poetry, Op. 53, 1978, The Fly
From William Blake's Poetry, Op. 53, 1978, The Garden Of Love
From William Blake's Poetry, Op. 53, 1978, The Little Vagabond
From Kathleen Raine's Poetry, Op. 55, 1978, Rock
From Kathleen Raine's Poetry, Op. 55, 1978, Love Poem
Miniature suite Op. 7A: I. Allegro vivace (Miniature March)
Miniature Suite Op. 7a: I. Allegro vivace (Miniature March)
Miniature Suite Op. 7a : II. Adagio sostenuto (Lullaby)
Miniature Suite Op. 7a: III. Grazioso (Waltz)
Miniature Suite Op. 7a: IV. Semplice (Lassie)
Miniature Suite Op. 7a: V. Presto (Hard-head)
Three Waltzes in A Minor Op. 32 : No. 1, (for Hege)
Three Waltzes in A Minor Op. 32: No. 2, (for Katrine)
Three Waltzes in A Minor Op. 32: No. 3, (for Pernille)
Sonatina No. 1 Op. 4: II. Adagio sostenuto, ma semplice
Sonatina No. 1 Op. 4: III. Allegro scherzando
Three Small Waltzes Op. 17: No. 1, Grazioso (for Torstein)
Three Small Waltzes Op. 17 : No. 2, Semplice, ma espressivo poco rubato (for Hanne)
Three Small Waltzes Op. 17: No. 3, Grazioso (for Eli)
Two Cheerful Pieces, Op. 42 : No. 1, Happy Wandering
Two Cheerful Pieces. Op. 42: No. 2, Little Fox
Mountain Tune and March, Op. 56: I. Mountain tune
Mountain Tune and March, Op. 56:: II. March
Sonatina No. 2 Op. 5: I. Allegro grazioso
Sonatina No. 2 Op. 5: II. Andante semplice
Sonatina No. 2 Op. 5: III. Allegro deciso
Fables Suite No. 1 Op. 10: I. Allegro con brio
Fables Suite No. 1 Op. 10: II. Andante espressivo, ma semplice
Fables Suite No. 1 Op. 10 : IV. Andante espressive e un poco rubato
Fables Suite No. 1 Op. 10: V. Allegro risoluto
Sonatina No. 3 Op. 14: I. Allegro grazioso
Sonatina No. 3 Op. 14: III. Allegro vivace
Sonatina for treble recorder, Op. 47: I. Allegro
Sonatina for treble recorder, Op. 47: II. Largo
Sonatina for treble recorder, Op. 47: III. Adagio - Allegretto
Slatter (Norwegian Dances), Op. 72 (arr. O. Sommerfeldt): No. 8. Bruremarsch (etter Myllarguten) (Wedding March after Myllarguten)
Slatter (Norwegian Dances), Op. 72 (arr. O. Sommerfeldt): No. 4. Haugelat: Halling (Halling from The Fairy Hill)
Slatter (Norwegian Dances), Op. 72 (arr. O. Sommerfeldt): No. 2. John Vestafes springdans (Jon Vestafe's Springar)
Grieg: Orchestral Music, Vol. 2 - Orchestrated Piano Pieces
The Chicago Brass Quintet: Music for Brass and Organ
Spring Tunes, Op. 44B: No. 2, Veslebekken
Spring Tunes Op. 44B: No. 3, Lys vårmorgen
Spring Tunes Op. 44B: No. 4, Fjell Lengt
Spring Tunes, Op. 44B: No. 5, Leik i vårbakken