Kalugin is a Russian surname. Notable people with the surname include: Erik Kalugin (1937–2003), Soviet sprint canoer Igor Kalugin (1943-2005), Soviet and Russian poet, known for an attempted aircr
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 0x668263c1a2ed6e82a83091f49b674a7099f1df697ff7774c415b88f90e01038b. Chain 2 (Bitcoin): anchored in block 954046 (2026-06-17T04:53:03Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4103c0df-e6f0-4f37-be13-a3700b18ac7c.json and https://artists.proofprofile.net/proofs/artist/4103c0df-e6f0-4f37-be13-a3700b18ac7c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.