Antonina may refer to: Geography Antonina, Paraná, a municipality in Brazil Antonina, Bełchatów County, in Łódź Voivodeship, central Poland Antonina, Pajęczno County, in Łódź Voivodeship, central
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 0xac22d48fa1470c56e493c90ff0db5adc222b66b42241ebaef13271606d9bcd4f. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a526d02a-c25c-4964-8b66-19cb8c1ea8f9.json and https://artists.proofprofile.net/proofs/artist/a526d02a-c25c-4964-8b66-19cb8c1ea8f9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).