Franz Vorraber (born 24 August 1962) is an Austrian and German pianist and composer. Studies Born in Graz the son of an organist, Vorraber started practicing the piano at the age of five, followed
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 0xf22750b89c462ca8dbb7b9369b5ade3efdde7654e87232d6d591f71e67c78181. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a555098a-21c3-4703-9a23-01c8dbe71360.json and https://artists.proofprofile.net/proofs/artist/a555098a-21c3-4703-9a23-01c8dbe71360.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Fuchs: Piano Concerto, Op. 27 & Serenade No. 5, Op. 53
Vorraber: Gedanken über R. S. für Oboe, Fagott und Klavier, Op. 7
Schumann: Sonate Op. 14, Humoreske Op. 20
Castle Concerts: Centuries of Romance (Live)
Grand Piano Masters: Variations by Mendelssohn, Mozart & Vorraber
Chopin: Piano Concerto No. 1 in E Minor, Op. 11 (Arr. for Piano & String Orchestra)
Franz Vorraber & Peter Härtling: Sätze von Liebe (Sentences of Love)
Schubert: Four Impromptus, Op. 90, D. 899
Charles-Camille Saint-Saëns, Antonín Dvorák
Robert Schumann: Complete Piano Works 13
Robert Schumann: Complete Piano Works 12
Robert Schumann: Complete Piano Works 11
Robert Schumann: Complete Piano Works 10