Carl Frühling (28 November 186825 November 1937) was an Austrian composer and pianist. Born in Lemberg (now Lviv, Ukraine), he attended from 1887 until 1889 the Gesellschaft der Musikfreunde where he
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 0x7b5ca2d7a17316f77bdd42436f6ae4a2dab7d451a6023b07ec8edb6829f606f0. Chain 2 (Bitcoin): anchored in block 953889 (2026-06-16T04:57:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0e5bff71-0325-41e3-8096-1ea6e37746fc.json and https://artists.proofprofile.net/proofs/artist/0e5bff71-0325-41e3-8096-1ea6e37746fc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Frühling: Piano Quintet in F-Sharp Minor, Op. 30 & Piano Quartet in D Major, Op. 35
Steven Isserlis: The Complete RCA Recordings
Cello Concerto No. 1 in C Major, Hob.VIIb:1: III. Allegro molto
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 0xe21cf94ea45dc13398b73c53fff4171ac45625ad9c25f6fc36ff0d23e4af78bd. 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/USBC19600043.
Opera & Song Transcriptions for Solo Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x423bd3c77b249adef79fd6b411b886ce7d00fbbf4191fa645a0e91c028910589. 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/KRB461800300.
Brahms-Schumann-Fruhling: Clarinet Trios
Spohr: 6 German Songs, Op. 103 / Fruhling: Trio, Op. 40
Second World War Masterpieces for Flute & Piano
Kronke, Reger & Others: Works for Flute & Piano
Les exquises Allégories (The Exquisite Allegories)
Chamber Music Conference: Faculty Concert Recordings, 1956-2019, Vol. 6