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 0x27a5dcecc8d373dddce57d10dd2b78bd445a8f1e2eacdd0afdfd22406f8f056a. Chain 2 (Bitcoin): anchored in block 953657 (2026-06-14T16:43:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4ec9cf05-8f36-4a44-b90c-f4e54cd1dac7.json and https://artists.proofprofile.net/proofs/artist/4ec9cf05-8f36-4a44-b90c-f4e54cd1dac7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Stone Free: Jojo's Bizarre Adventure / Stone Ocean (Jolyne's Theme)
Soft and Wet (Josuke Higashikata 8/Gappy)