Konstantin Scherbakov (11 June 1963 in Barnaul, Siberia, Russian SFSR) is a Russian-Swiss pianist. He was the winner of the first Rachmaninoff piano competition in 1983 in Moscow. In 1990, he played f
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 0xfb5b40f12363bb5f2a88c658d14e7be5e5c9b17e73cf4c1986f7df1bd5d8489b. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d9ee45f-e3aa-4462-a925-5dbbd77fa139.json and https://artists.proofprofile.net/proofs/artist/0d9ee45f-e3aa-4462-a925-5dbbd77fa139.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0xfc1ef7143e7fbef047a095f83c634620822fa4127281106515be494308a8b030. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9501025 — a six-check JSON result.
Franck / Ravel / Respighi : Piano Concertos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f6d9c75bb6e87d8a376b4f660e3db2428fcac2004b1f6fcb2333795ead6c2c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505001 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e751381bfbe444b9c1c7156ca58e24ec709bb05dec0b1e61c58ecccfadc9817. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c306a98c06903d79a39a3f27ebebc6019159780898cc316489cd48434280235. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505003 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf2c89970b4c3cba9e032d8b1c2d469ac46a8d09effad8aa4ea8b34590c900cc. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505004 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa78a8d7f3ed96abbf560e91223b697d8e6e37999a3731509f844d1e6c8fd1310. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505005 — a six-check JSON result.
L'Arlésienne Suite No. 1, Op. 23b, WD 40: Bizet - L'Arlesienne Suite No. 1: III. Adagietto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ebd7269e5323d4d9fb08794424907993067dc7a468dc190219ab511e850ba4e. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505007 — a six-check JSON result.
Concerto romantique, Op. 35: Godard - Concerto Romantique, Op. 35: III. Canzonetta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72acc30e82e5120c6222d4b73198a632cf003bb2d20c649c9c27ca55dde0015e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505008 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51e29efceba4d5d0ec4b2284c354fa9de336d73c971cf883de6a16581f4451c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505010 — a six-check JSON result.
Le carnaval des animaux: Saint-Saens - Carnival of the Animals: XIII. Le Cygne (The Swan)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc4d277968ff69d542e6e9bffeea36e2c46885bc180b9f383ceeaabadebafa2. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505011 — a six-check JSON result.
Iberia, Book 2: Albeniz - Iberia, Book 2: III. Triana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37de4d753aa8aebe4351a6ecbd0fa55b3b81fb886910f909d116ba42b69cb1ef. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505012 — a six-check JSON result.
España, Op. 165: Albeniz - Espana, Op. 165: II. Tango
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7b4a1f89d25b1b1b805b6b23062b4c0427f011618d87830abe787117995d8bd. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505013 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd3f9fedc714e0d7a3fa38f5111d722f8c236f11632ce9eb4a42b5337285accf. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505014 — a six-check JSON result.
Straus - Der Letzte Walzer (The Last Waltz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3828ecdc5c3b0f0f001a8a7d205109f15ea88b5d66e1b4e1ef40bbab4a7a819. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505016 — a six-check JSON result.
3 Symphonische Metamorphosen Johann Strauss'scher Themen: No. 2. Die Fledermaus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90e31205f839e4821c66ee82150fafc9d57219b6b5b6122b57349765f6f2704f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505017 — a six-check JSON result.
XIII. Le cygne (Transcr. L. Godowsky for Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc4d277968ff69d542e6e9bffeea36e2c46885bc180b9f383ceeaabadebafa2. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191505011 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdb715fb73b208f2138fc6b9c3da2613354d2c051ca19210d5108cbfaffc06fa. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199638514 — a six-check JSON result.
Shostakovich Doppeltes Spiel: No. 1, Roter Oktober
Schostakowitsch: Doppeltes Spiel -playing a double game (CD 1 - 3 in German)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127f51d63275815d50bc42529a7db3a6bad9aff93bf1387b063f1e1e0fcd58aa. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELW72192901 — a six-check JSON result.
Shostakovich Doppeltes Spiel: No. 2, Die wilden Zwanziger
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x641694af5450492a0fff96f2eb5d2df9954a1075db97658e6e2f83e051959aff. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DELW72192902 — a six-check JSON result.
53 Studies on the Chopin Études: No. 2 in D-Flat Major (2nd Version after Chopin's Op. 10 No. 1, for the left hand alone)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31d19b743a2a0eee4e4fdb2e28ba6b061b4e20d69cf195e4f9c16824fcfae8d6. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192304901 — a six-check JSON result.