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 0xf58ee6bcfb7a5361d3ec72df16de227839076ffde614bed668fa6eb75071ec62. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f94fee89-d7ab-4a1e-b348-c22a10477737.json and https://artists.proofprofile.net/proofs/artist/f94fee89-d7ab-4a1e-b348-c22a10477737.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Great Violin Concertos Recorded in Berlin
Strauss: Der Rosenkavalier Op. 59, TrV 227
Humperdinck: Hänsel und Gretel (Hansel & Gretel) [Recorded 1944]
Milestones of a Legend: Georg Kulenkampff, Vol. 6
Milestones of a Legend: Georg Kulenkampff, Vol. 3 (1939, 1941)
Milestones of a Legend: Georg Kuhlenkampff, Vol. 1
Grosse Sänger unseres Jahrhunderts: Inge Borkh
Mozart: Idomeneo re di Creta, K. 366 (Sung in German) [Recorded 1954]
Portrait Pilar Lorengar (Live and Studio Recordings from 1959-1962)
Karl Schmitt-Walter, Vol. 1: Opera, Operetta and Song
Portrait Bronislaw Gimpel (Violin Concertos & Violin Sonatas in recordings for RIAS Berlin, 1954-1957)
Margareta Hallin: The Early Recordings (1955-1960)
Gerhard Taschner: Samtliche Schellack-Aufnahmen (1941-1944, 1948)
Beethoven, L. Van: Piano Concerto No. 1 (Gieseking, Philharmonia, Kubelik) (1948) / Piano Concerto No. 5 (Gieseking, Berlin Radio, Rother) (1945)
Mozart, Wagner, Verdi & Others: Opera Excerpts
Legenden Des Gesanges, Vol. 5: Peter Anders (1933-1953)
Puccini: La bohème, SC 67 (Excerpts Sung in German)
Mozart: La flûte enchantée, extraits choisis (Mono Version)
Wagner: Tristan et Isolde, Extraits (Mono Version)
R. Strauss: Concerto pour hautbois & Concerto pour violon (Mono Version)
Heroes and Heroines of Bayreuth: Wolfgang Windgassen (1952, 1954)
Mozart: Les ouvertures célèbres (Mono Version)
Wagner: Extracts of Crépuscule des dieux & Tristan et Isolde (Mono Version)