Daria Sergeyevna Nagornaya (née Spiridonova ; born 8 July 1998) is a Russian former artistic gymnast. Primarily an uneven bars specialist, she is the 2015 World Champion, the 2015 European Champion,
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 0x9942173ff13c69197b23eed0070821e7df57a0d9d16a220ec3acd845b76e678d. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0d74dc0-ba6d-44fe-a89a-a10d3ac1b228.json and https://artists.proofprofile.net/proofs/artist/d0d74dc0-ba6d-44fe-a89a-a10d3ac1b228.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).