Vladimir Stoupel (born 10 May 1962) is a Russian-born French pianist and conductor. He began studying the piano at age of three with his mother, Rimma Bobritskaia. He made his debut at the age of twe
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 0x03778f8eddb0d340f192b4d9c65df110f77dcfa4164b67a991e51a446fa2d63f. 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/e9f23c8e-2027-40ab-a3db-f57aa5a579dd.json and https://artists.proofprofile.net/proofs/artist/e9f23c8e-2027-40ab-a3db-f57aa5a579dd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vierne: Violin Sonata in G Minor, Op. 23 & Piano Quintet in C Minor, Op. 42
Rarities of Piano Music 1999 - Live Recordings from the Husum Festival
Viola Sonata: I. Impetuoso. Poco agitato
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 0xd6ed3663da8a14bf156f963b75c53023185cd86f3e778f251896ae4fcfd16a4f. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEU921912501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2c1d3faa4289c639d49aa08cc171e3e3e189939994c6191a27b31d30304ff6c. 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/DEU921912503.
Violin Sonata in D Major: II. Andante quasi adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfabd0569821a6631293f746adc788969ed13f5da23b1f226933680747296a99. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEU921912505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb631df89704d78911baf5db5e004859f88a99b461eecde4cb275e9d16efbef1a. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/DEU921912502.
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
Violin Sonata in D Major: I. Allegro Comodo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea52232db2b5c5fd6043ccfe7ec83d5ce7f8a7f42c878b9a15dd5c474c48e279. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DEU921912504.
Rathaus, Tiessen & Arma: Sonatas for Violin & Piano
Weinberg: Wir gratulieren!, Op. 111 (Live)
Poulenc, Ferroud & Ravel: Violin Sonatas
Works for Violin and Piano By Igor Stravinsky and Dmitri Shostakovich (Stravinsky: Divertimento for Violin and Piano; Shostakovich: Sonata for Violin and Piano, Op. 134)
Alexander Scriabin: The Complete Piano Sonatas
Nancarrow / Antheil / Roslavets / Szpilman / Mossolov: The Life of the Machines
Henri Vieuxtemps: Complete Works for Viola & Piano