thumb|Ernst Toch in 1919 Ernst Toch (; 7 December 1887 – 1 October 1964) was an Austrian composer of European classical music and film scores, who from 1933 worked as an émigré in Paris, London and N
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 0x757a088e78296404b802686425d59c47c68c22b472286f7d1d4a9097ac8e2b48. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/31249f1e-e6a5-4299-a8b5-c1d58b0766b1.json and https://artists.proofprofile.net/proofs/artist/31249f1e-e6a5-4299-a8b5-c1d58b0766b1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Toch: String Quartets Nos. 7 and 10 & Dedication
Toch: Symphony for Piano and Orchestra, Quintet for Piano and Strings
Toch: Cantata of the Bitter Herbs / Jephta
Toch: Piano Quintet / Violin Sonata No. 2 / Burlesken / 3 Impromptus
Ernst Toch: Werke Aus Der Mannheimer Zeit
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0495caa848126e848799893c494ada3e16e5b67af1a711bf9b8191dd8f784c90. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DED811065203.
Toch: Die chinesische Flote - Egon und Emilie
Toch: Bunte Suite, Mozart Transcriptions & Cello Concerto
Milken Archive Digital Volume 17, Album 5: Ode and Epics - Dramatic Music of Jewish Experience
Rihm: Konzert in einem Satz - Toch: Cello Concerto
Toch: Violin Sonata No. 1 - Cello Sonata - String Trio
Ernst Toch: Die chinesische Flöte, Op. 29 & Tanz Suite, Op. 30
Ernst Toch: Zweites Klavierkonzert, Op. 61 & Musik für Orchester und eine Baritonstimme