Viktoria Valentinovna Postnikova (; born 12 January 1944) is a Russian pianist. Biography Postnikova was born in Moscow into a family of musicians. She entered the Central Music School of the Moscow
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 0xed80b2a78ef870e880ce58bd73b258bac741e26986c540ee86616e7cc974839b. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de587db3-703a-4e40-8ddc-a6ad677e7e82.json and https://artists.proofprofile.net/proofs/artist/de587db3-703a-4e40-8ddc-a6ad677e7e82.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Vladimir Spivakov & Viktoria Postnikova: César Franck, Béla Bartók
Viktoria Postnikova Plays Chopin and Rachmaninoff Preludes
Tchaikovsky: Children's Album, Op. 39: No. 23, The Organ-Grinder Sings
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 0x62871c1a9e07d44581f5dcc50416ebf00e3a9108a5efafec1d62f6e702b5c832. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/FRZ209100024.