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 0x534bfe82a86ab8f158f6077dac8ac4f30b91e6c2736f6c791b5b02b3e7ebacb2. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cd491798-070c-4a43-ad51-4c581d3f8b50.json and https://artists.proofprofile.net/proofs/artist/cd491798-070c-4a43-ad51-4c581d3f8b50.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
LLIBRE VERMELL / Maríusöngvar frá miðöldum