</noinclude> The terms (AD) and before Christ (BC) are used when designating years in the Gregorian and Julian calendars. The term is Medieval Latin and means "in the year of the Lord" but is often
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d833b805d1c67cc48197c4026810e4bfeaa08f0e524b495476168d420d813a. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/79f60e59-60e0-4cea-9c36-c6dca874ee25.json and https://artists.proofprofile.net/proofs/artist/79f60e59-60e0-4cea-9c36-c6dca874ee25.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).