Lack may refer to: Places Lack, County Fermanagh, a townland in Northern Ireland Lack, Poland Łąck, Poland Lack Township, Juniata County, Pennsylvania, US Other uses Lack (surname) Lack (m
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 0x3c4ccee88e17312fedbb80375e5809829e0d4e15fe8bbf228f4e822b74c877de. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a617b21e-b7ac-4679-9898-b102d5b064f2.json and https://artists.proofprofile.net/proofs/artist/a617b21e-b7ac-4679-9898-b102d5b064f2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).