VXL, the Vision-something-Library, is a large collection of open source C++ libraries for computer vision. The idea of the naming is to replace X with one of many letters to obtain the smaller library
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 0xdc734caf7d0ac98f3ef602a73ee21819ae6b204b31f1ee6292ff6d1a9b547608. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dd3aeb7f-78db-4d3a-b54a-23659a511b22.json and https://artists.proofprofile.net/proofs/artist/dd3aeb7f-78db-4d3a-b54a-23659a511b22.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).