Ostin or Østin is a surname. Notable people with the surname include: Arild Østin Ommundsen (born 1969), Norwegian film director and screenwriter Michael Ostin (), American music industry executive
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 0x0d569b96d6fd0bb5adbb0204f7d1ed576fd6d1e6d2b233b022dcae2949b3a355. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/93e36115-2cf1-4cdc-9b75-325212757b9f.json and https://artists.proofprofile.net/proofs/artist/93e36115-2cf1-4cdc-9b75-325212757b9f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).