thumb|Egon Petri Egon Petri (23 March 188127 May 1962) was a Dutch-American pianist. Life and career Petri's family was Dutch. He was born a Dutch citizen in Hanover, Germany, and grew up in Dresd
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 0x130cdda479fd74e461aadd0dd143d52bdea53bba784a9128aedbc954234fc052. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d9b8ad5-55bc-44de-89ec-9f08fa7f841d.json and https://artists.proofprofile.net/proofs/artist/7d9b8ad5-55bc-44de-89ec-9f08fa7f841d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Sonata No. 14 in C sharp minor, Op. 27 No. 2 -"Moonlight": 1. Adagio sostenuto
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 0xc1a06f8abf502d4e1a40dd4e4165c40fa1abe202035b7bd766e722c15cae7760. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEF055409561.
The Complete Columbia & Electrola Solo & Concerto Recordings (Recorded 1929-1951)
Brahms: Variations on a Theme by Paganini, Op. 35
Brahms: Variations on a Theme by Handel, Op. 24
Brahms: Paganini and Handel Variations (Petri) (1937-1940)
Beethoven: Sonates pour piano "Pathétique", "Clair de lune" & "Appassionata" (Mono Version)
Beethoven: Sonates pour piano Nos. 30 & 31 (Mono Version)
Brahms: Rhapsodies, Op. 79, Intermezzi, Op. 117 & Ballades, Op. 10 (Mono Version)
London Philharmonic Orchestra / Egon Petri spielen: Peter Tschaikowsky: Klavierkonzert Nr. 1, Op. 23