thumb|An original Ouija board created thumb|Norman Rockwell cover of the May 1, 1920 issue of The Saturday Evening Post, showing a Ouija board in use The Ouija ( , ), also known as a Ouija board, s
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 0x3c7d19d57329cc94901577a36c0c58f5e4b204376d4d74b0c4693a6b5ef3ed3f. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9dd21753-34f0-4769-b5ed-ad03ff6699b0.json and https://artists.proofprofile.net/proofs/artist/9dd21753-34f0-4769-b5ed-ad03ff6699b0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).