Duvy () is a commune in the Oise department in northern France. See also Communes of the Oise department References Category:Communes of Oise
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 0x2b8f40a70c4e4be9aaaae821040aee14ae788e564a3d1fac27a92c25bd38b926. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a58c7d2-fa77-4c41-869d-826c9e17f115.json and https://artists.proofprofile.net/proofs/artist/4a58c7d2-fa77-4c41-869d-826c9e17f115.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).