Duro may refer to: Duro (monetary unit), a nickname for the five peseta coin Duro v. Reina (1990), a U.S. Supreme Court case Angelo Duro, Italian comedian Ibrahim Duro, Bosnian footballer Jaime Duro,
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e8c00d04676971b3def1cffab3866fd60a364e24acf6093b4e241829697dcd. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/644e0bad-3bf3-40c7-8d4e-523be65931d8.json and https://artists.proofprofile.net/proofs/artist/644e0bad-3bf3-40c7-8d4e-523be65931d8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).