thumb|The guillotine used in Luxembourg between 1798 and 1821 A guillotine ( ) is an apparatus designed for effectively carrying out executions by beheading. The device consists of a tall, upright
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 0x698d85f1088b0b3fdb77077b200bcf48310632283165f247249f31d3dc9a8d56. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5419d851-0571-4b3c-967d-f1f848676385.json and https://artists.proofprofile.net/proofs/artist/5419d851-0571-4b3c-967d-f1f848676385.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).