For the piece of medieval armor, see tassets You might also mean tasse à café Tasse is a revival of Paul Renner's Steile Futura. The family consists of 4 weights and 5 widths each, but no italic font
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 0xcd0cf96d2d3af88aa19d681f78d4b6a58460dbd3e021499f835a04ac9a96bca5. 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/36ca2e0a-b6db-4491-9223-b0b62ac5975e.json and https://artists.proofprofile.net/proofs/artist/36ca2e0a-b6db-4491-9223-b0b62ac5975e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).