Ernst Gröschel (9 December 1918 in Nuremberg – 5 May 2000 in Zams, Tirol) was a German pianist. Gröschel studied with Emil von Sauer and others in Vienna. He is regarded as the first pianist who playe
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 0x0f7dae174a96287002a51906a1e533ad403110310494651c78e0964cfcc0f33a. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a46ba75-cd34-46ed-97a4-fa8239037113.json and https://artists.proofprofile.net/proofs/artist/4a46ba75-cd34-46ed-97a4-fa8239037113.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Haydn: Andante With Variations In F Minor, Hob. Xvii:6
Schumann: Kinderszenen "Scenes from Childhood" Op.15
Mozart: Flute Concerto No.1 in D Major K. 285
Bartók: Hungarian Peasant Tunes No. 1 - 15, Sz. 71 (Digitally Remastered)
Beethoven: Concerto for Piano & Orchestra No. 4 in G Major, Op. 56 (Digitally Remastered)
Bartók: Piano Pieces (Digitally Remastered)
Beethoven: Sonata for Piano No. 24 in F-Sharp Major, Op. 78 (Digitally Remastered)
Brahms: Variations and Fugue for Piano on a Theme by Händel in B Major, Op. 24 (Digitally Remastered)
Debussy: Images I for Piano, L.110 (Digitally Remastered)
Debussy: Arabesque No. 1 in E Major, L. 66 (Digitally Remastered)
Debussy: Estampes, L. 100 (Digitally Remastered)
Kodály: Seven Pieces for Piano, Op. 11 (Digitally Remastered)
Haydn: Piano Sonata in F Major, Hob. XVI:23 (Digitally Remastered)
100 Most Relaxing Classical Music In The Universe
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 0x2a3554c391c09eff198e10e4cf34116d1e4c421808fff2a867bcc86e9b26d6fb. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USSJ10813899.
Sonata No. 12 in D Minor, Op. 5, "La Follia": Variations over an old Spanish Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2612f8279865829c5ed7e381d8172b3e62a786fd110626fd6c447fb071e6fa92. 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/SEWDL9430578.