The MATADOR (man-portable, anti-tank, anti-door) is a man-portable, disposable anti-armour and anti-brickwall weapon system developed by Germany, Israel and Singapore. It is an updated version of the
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 0x74c7d45b3898541b7108d1166170c6931db660e920e4ec07497250f30b901ec2. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0d33053-0e65-4fee-92ab-66ac5d3f1d84.json and https://artists.proofprofile.net/proofs/artist/d0d33053-0e65-4fee-92ab-66ac5d3f1d84.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).