McMuffin is a family of breakfast sandwiches sold by the international fast food restaurant chain McDonald's. The Egg McMuffin is the signature sandwich, which was invented in 1972 by Herb Peterson to
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 0x62fc79145a950e2e974943f7d4abba0d60dd43e1dbd8d5c71b0401623a93d241. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3f700fb6-74fb-489c-a2bf-e26a1c19a807.json and https://artists.proofprofile.net/proofs/artist/3f700fb6-74fb-489c-a2bf-e26a1c19a807.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).