Mária Róka (15 September 1940 – 28 September 2021Szörnyű hír érkezett, férje után halt a magyar olimpikon sportolónő ) was a Hungarian canoe sprinter who competed in the mid-1960s. At the 1964 Summer
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 0xa621f839d4d772382c2f86a21d08dc87d1ec4b0310cc5e4d1e7d1ac1a48395a8. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b965236c-87ff-4ee2-824e-aef7affc7f7a.json and https://artists.proofprofile.net/proofs/artist/b965236c-87ff-4ee2-824e-aef7affc7f7a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).