thumb|250px Jozef Kroner (20 March 1924 in Staškov – 12 March 1998 in Bratislava) was a Slovak actor. His brother Ľudovít Kroner, daughter Zuzana Kronerová, and wife Terézia Hurbanová-Kronerová were a
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 0x10a36b46a1142e5cee7b1ecdd9ff0cbdf8f876897aed8de9f0bf2532348be22a. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bc76a452-d061-4a15-a8dd-5d2a7b302357.json and https://artists.proofprofile.net/proofs/artist/bc76a452-d061-4a15-a8dd-5d2a7b302357.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).