Sixtus is a Roman name, a corruption of the Greek name "", meaning "polished", and originally Latinized "Xystus". Its Spanish form is Sixto. Sixtus of Reims (d. c. 300), bishop of Reims Sixtus of Esz
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 0xc3644fae81a057377230672eb13d2384c9b8f061e6b03601536db09e762be790. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a89104e-1f2b-4018-8648-9e2da0b19e6a.json and https://artists.proofprofile.net/proofs/artist/9a89104e-1f2b-4018-8648-9e2da0b19e6a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).