Margarita Vitalievna Gritskova (; born 9 December 1987) is a Russian mezzo-soprano in opera and lied singing. A member of the Vienna State Opera since 2012, she is focused on roles by Rossini such as
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 0xe19b6af11f90724276a29a3aa0f19385140183c62d767c7e18f083a31a35586f. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/96aff89b-cf56-4722-b0c1-87581fa73d97.json and https://artists.proofprofile.net/proofs/artist/96aff89b-cf56-4722-b0c1-87581fa73d97.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).