Ivanoff (feminine: Ivanoffa) is a surname. People with the surname include: Serge Ivanoff (1893–1983), Russian painter Victor Ivanoff (1909–1990), Russian-born South African painter and cartoonist Ju
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 0xd8c76fcea06f7bdbb04aa72b400cee563c5a3d64d2d8521c3d3502ad23a9c7d8. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fa8dcfab-c14f-4062-a20a-c529621ec1ff.json and https://artists.proofprofile.net/proofs/artist/fa8dcfab-c14f-4062-a20a-c529621ec1ff.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).