thumb|Cootie Game, a board game from 1918 Cooties is a fictitious childhood disease, commonly represented as childlore. It is used in the United States, Canada, Australia, New Zealand, and the Philip
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8532dd969c56b5e1660392d30fc71869a8baed64c237969e043d09ab0424866. Chain 2 (Bitcoin): anchored in block 954134 (2026-06-17T19:41:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f1d9fef-df80-4a6f-871f-c4079d061934.json and https://artists.proofprofile.net/proofs/artist/7f1d9fef-df80-4a6f-871f-c4079d061934.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).