Katarina most commonly refers to: Katarina (given name), a feminine given name Katarina may also refer to: Katarina nad Medvodami, former name of Topol pri Medvodah, a settlement in Slovenia Katar
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 0xb732d325a878a990a27e08e523351170b8592b4899264fb0dc5c6970ad0f9603. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/029120f2-27bf-4070-9161-e07da4e2a280.json and https://artists.proofprofile.net/proofs/artist/029120f2-27bf-4070-9161-e07da4e2a280.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).