Rustem Hayroudinoff () is a Russian concert pianist. Tatar by nationality, he was born in Kazan, Russian Federation (Republic of Tatarstan). His father, Afzal Hayroudinoff is a professor of Cello at t
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 0x8a635bcd33cf1edc980696d0bba7f9d706ddd8674c2f4a2d01c638484a65da79. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9f6ea65a-2627-409e-a0ca-d34a3f847727.json and https://artists.proofprofile.net/proofs/artist/9f6ea65a-2627-409e-a0ca-d34a3f847727.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Piano Sonata No. 1 in D Minor, Op. 28: II. Lento
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 0xaabe25e510732561e4bfdad4405533408de19616da447d96470686b6381ab349. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBPCP1700303 — a six-check JSON result.
Sonata No. 1 in C for violin & piano, RV3 ("Manchester Sonata"): 3. Largo
Vikram Seth: An Equal Music - Music from the Best-Selling Novel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fd1aba2f4cf29f9f4c47687b5dc194a419cfea8ff015e038ff1f909c685d900. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBF079912260 — a six-check JSON result.
The Art of Fugue, BWV 1080 - Version for Piano: Contrapunctus I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa156375fea4c9a583f32278ff1c93f6b8090f0e4e038bf6534db7fde6e41bded. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/GBF079912270 — a six-check JSON result.