thumb|From a copy of "Decorative Patterns of the Ancient world," by Sir Flinders Petrie. A stain is a discoloration that can be clearly distinguished from the surface, material, or medium it is found
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 0x5644d6689bdc2c6eee07698fe33cce8daee98f23c3a1c7cad1e169ffcee80947. 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/4b869b94-1675-40a3-8a20-02e917f63402.json and https://artists.proofprofile.net/proofs/artist/4b869b94-1675-40a3-8a20-02e917f63402.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).