1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 artist was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3ea9433f49ce27dfa46fc63f63af0f5cdb71d9a786c394492c4edb39ac68ec4. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a43e458-44db-43f4-9670-3698ae10263f.json and https://artists.proofprofile.net/proofs/artist/4a43e458-44db-43f4-9670-3698ae10263f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sketchbook, Page 1: Because the Summer...