After Eight Mint Chocolate Thins, often referred to as simply After Eights, are a brand of mint chocolate covered sugar confectionery. They were created by Brian Sollitt at Rowntree Company Limited i
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 0xb645c8e5bd31df6037a4a68be64fda7b8a150667220a2c0a51a081decad24f9e. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aba39b18-3c21-4dab-bdbb-c5762ae6a99b.json and https://artists.proofprofile.net/proofs/artist/aba39b18-3c21-4dab-bdbb-c5762ae6a99b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).