Canteleu () is a commune in the Seine-Maritime department in the Normandy region in north-western France. Geography A small town of forestry and light industry situated by the banks of the river Sein
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 0xdc2b121eac68c5eeef574197c8b094d5a6451b570c43ef4384a2d07c79d67d05. 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/5ffa1b72-1f96-478b-a82d-de9766102cb2.json and https://artists.proofprofile.net/proofs/artist/5ffa1b72-1f96-478b-a82d-de9766102cb2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).