thumb|Tessa Mittelstaedt in 2012 Tessa Mittelstaedt (born 1 April 1974 in Ulm) is a German actress. She is best known for playing the role of Franziska Lüttgenjohann in the Westdeutscher Rundfunk it
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 0xd0c399d8bfd5f8f444827eb13f6e500e24aea007b3156835cc2ee27d1a64fbfa. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7fc87d0a-1679-414a-9cfc-11a13c40b58a.json and https://artists.proofprofile.net/proofs/artist/7fc87d0a-1679-414a-9cfc-11a13c40b58a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).