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 0x8e74b17d1f5f2602d160dec038668bf1b6d49332980d01a0373d988e9849c875. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/18a1ba6e-bdeb-49dc-ad87-d03d37258a80.json and https://artists.proofprofile.net/proofs/artist/18a1ba6e-bdeb-49dc-ad87-d03d37258a80.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Various Artists #03 (HCVA03): Spitfire x StayUpForever
Various Artists #04 (HCVA04) : ARMOR-PIERCER
Various Artists #05 (HCVA05): Steel Helmet