Karl Willetts (born 21 September 1966) is an English death metal vocalist, best known as the lead singer of Bolt Thrower and Memoriam. Biography Willetts joined the British death metal band Bolt Thr
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 0x1211bd2c1c9d9a6f2a6d8570acf28b593231a6455d720131d2c21e63013f3bcd. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/82b45bea-c2eb-4e16-b87d-39dd7ce288ac.json and https://artists.proofprofile.net/proofs/artist/82b45bea-c2eb-4e16-b87d-39dd7ce288ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).