Denis Viktorovich Kozhukhin (; born in Gorky, 2 July 1986) is a Russian pianist who was awarded third prize in the 2006 Leeds International Piano Competition. He was also awarded first prize in the 20
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 0xdfd0e761e44234cb6aac2bbb761f9d3828a95447274e322dfe85e20eb79fc4bb. 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/d1247bf4-dd02-4564-ba35-3fd172bca23a.json and https://artists.proofprofile.net/proofs/artist/d1247bf4-dd02-4564-ba35-3fd172bca23a.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Songs Without Words, Book 2, Op. 30: No. 6 in F-Sharp Minor, MWV U 110 "Venetianisches Gondellied"
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 0xdb7b8d8cb96fb630696707a4bd7dc8d9170926c203672fcc7b7e6e9fee4efd1d. 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/NLE421901606 — a six-check JSON result.
7 Fantasien, Op. 116: No. 4 in E Major, Intermezzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce353e4cf0ac7762fd91c088ec7ad5fbaa7579feccee0e2ad5d7bf4e99630b3. 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/NLE421502709 — a six-check JSON result.
Piano Concerto in G Major, M. 83: II. Adagio assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79b5e0ed8f4e42620a078709d40a8182638787a5f869b5b9e174da5b1e569dfc. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/NLE421602502 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e27749117149db8c59497e709d4df6f6f561bfba6e031cfa9ebe7da0a547d5e. 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/NLE421901613 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13692354f695279b9b378d859ba8cb2cc0cbaf98560288a95d594036d85e3f48. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLE421901614 — a six-check JSON result.
Lyrical Pieces, Op. 12: No. 4, Elves' dance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x706450c0d0349d0b0fcc2cb0d314baf2adc6d2fd32c759f360acb39fff966f87. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/NLE421901615 — a six-check JSON result.