Nikita Arnoldovich Koshkin (; born 28 February 1956) is a classical guitarist-composer born in Moscow USSR. His early influences included Stravinsky, Shostakovich and Prokofiev, as well as rock music
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 0x3d9b0b492b7afa27ce207250366154465e1c70a53e63dcfaf7cff489d0159630. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f62153bf-0f1a-4c5d-9ebb-3e2facb19f5e.json and https://artists.proofprofile.net/proofs/artist/f62153bf-0f1a-4c5d-9ebb-3e2facb19f5e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Koshkin: Polka Papandreou / Ballads / Prelude and Waltz
Koshkin: Concerto for Guitar and Strings "Megaron" (Live)
Nikita Koshkin: 24 Preludes & Fugues, Vol. 1
24 Preludes & Fugues, Vol. 1: Fugue No. 1 in C Major
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 0xa52f3f74a7a8f944ad9f2f644024af13c8ebcc65c672ad2a71c549128ef42d06. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T23:00:40Z), 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/HKI191927602.
Vera Danilina: First Prize 2022 Michele Pittaluga Guitar Competition, Alessandria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e375822a31bb1ca991dc2bc5e41d469393c830a687f98c5181f67260af4d4a. 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/USB8U2301484.
Guitar Sonata No. 2: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a123b81ef6994f50465f7493fce08ee22ac5b75fe80574def714e189d93dea3. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/USB8U2301485.
Guitar Sonata No. 2: II. Adagio - Con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b85147320fb228bdf0183e671771e89b567f0f40d097000de3bae3a505681d5. 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/USB8U2301486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ff07502b085c0768c02389be50b87c8ecce62b4cb76bf86655c17dce4161da0. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U2301487.
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
Guitar Recital: Bianco, Gabriel - Mertz, J.K. / Bach, J.S / Koshkin, N.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51a30a830cce8983089cef0cc0a5dac1a34881ff3880f73b168f3e537ee8411a. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/HKI190914810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x293fb8ed8cde33bfe6b8c84095bcd36c75e59f22a3922b88ef175ccfd0bd739b. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/HKI190914811.
Guitar Sonata: III. Presto, risoluto energico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47305b47b57b48a1de9d3062d89b0f2c72267f6a28ae97c0dd41d8111de51bc8. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190914812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58a0bfb3a32bd67cc24ac277e8dcaa128e77ebf336f0f579cbc7cb73f8606b93. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM10011018.