thumb|Rita Kinka Rita Kinka (born 1962, in Subotica), is a Serbian pianist of Hungarian descent. She graduated at the University of Novi Sad's Academy of Arts (where she is currently a professor) und
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 0x9975a61fe1a052d773cb61634410e556020293dbdc9daa3294ae9868e8698a22. Chain 2 (Bitcoin): anchored in block 954035 (2026-06-17T02:39:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3c502d55-eb5d-4c0d-95ed-26fcb97684d8.json and https://artists.proofprofile.net/proofs/artist/3c502d55-eb5d-4c0d-95ed-26fcb97684d8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.