thumb|The Mighty Upsetter dub show, Flog, Florence, Italy, 2009 The Upsetters were the house band for Jamaican reggae producer Lee "Scratch" Perry. The name of the band comes from Perry's nickname of
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 0x744dfecfaeffe4cb1171af494b6ce7cff54c2752b6a038e4de7fbfba5bbd27eb. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f32be519-bec7-4d90-8986-00182168abfc.json and https://artists.proofprofile.net/proofs/artist/f32be519-bec7-4d90-8986-00182168abfc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).