thumb|Zippers with common teeth variations: metal teeth (top), coil teeth and plastic teeth A zipper (N. America), zip, zip fastener (UK), formerly known as a clasp locker, is a commonly used device
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 0xc1897bc447a1ea9c9fb189fbd5be56d28d528c6ccc1d95de58ee9ab3c7522b9d. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d188d533-2f38-4a08-be8e-4adaf919c5d0.json and https://artists.proofprofile.net/proofs/artist/d188d533-2f38-4a08-be8e-4adaf919c5d0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Of Hearts & Stompboxes (Japanese Import)