thumb|upright=1.35|The exposed blade and tang of a Japanese sword without the hilt A blade is the sharp, cutting portion of a tool, weapon, or machine, specifically designed to puncture, chop, slice,
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 0xe3bebd5eb765f9b6e700eace6c47f8fb54e6a4830c484129c81454bd62df3577. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3e3e1918-a646-473f-8d7e-0f00a7b02375.json and https://artists.proofprofile.net/proofs/artist/3e3e1918-a646-473f-8d7e-0f00a7b02375.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).