The Big Mac is a brand of hamburger sold by the international fast food restaurant chain McDonald's. It was introduced by a Greater Pittsburgh area franchisee in 1967 and expanded nationwide in 1968,
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 0x9d082b4db2c96b5b8d54304af21e9e1df0cc5a9d6550f6742878c9842b598180. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4cd0f39b-8c8c-4f9e-af65-6a6ed704742c.json and https://artists.proofprofile.net/proofs/artist/4cd0f39b-8c8c-4f9e-af65-6a6ed704742c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).