LZ may refer to: Computing .lz, a filename extension for an lzip archive Abraham Lempel (born 1936) and Jacob Ziv (born 1931), Israeli computer scientists: Lempel-Ziv, prefix for family of data co
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 0xc029740f54c300016752f5b7618d1abb4b0ab84e43efc23c3af2479cf58a6b3f. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fcbbbfc8-b110-482e-9285-8cda7b78fe01.json and https://artists.proofprofile.net/proofs/artist/fcbbbfc8-b110-482e-9285-8cda7b78fe01.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).