thumb|Rain gutter and downspout thumb|A downspout in Strasbourg Place du Chateau. thumb|Wooden gutter, covered with birch bark (St. Nicholas Church, Vitoslavlicy, Russia - 1650 year) A downspout, wat
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 0xe7770739b0220a1008d450754252e96d3cb07a9d9e6e883728fc6bddab87504a. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ae18bcdd-83f1-4d8b-8ce5-f3f19212fa80.json and https://artists.proofprofile.net/proofs/artist/ae18bcdd-83f1-4d8b-8ce5-f3f19212fa80.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).