Sikk is an Estonian surname. Notable people with the surname include: Alar Sikk (born 1966), Estonian alpinist Evald Sikk (1910–1945), Estonian wrestler Kuldar Sikk (born 1979), Estonian rally co-dri
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf520e50e4d3cd073470b6e91c2f618adc1443f3b59dc4c6561d1dce0c7693074. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/66b8956c-d125-4d39-800f-51989a597827.json and https://artists.proofprofile.net/proofs/artist/66b8956c-d125-4d39-800f-51989a597827.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).