Royan (; Roeyan in the Saintongeais dialect; ) is a commune and town in the south-west of France, in the department of Charente-Maritime in the Nouvelle-Aquitaine region.Commune de Royan (17306), INS
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 0x30c3958e82d1f963a35af033086b1bab37cfcbce892a9d61b56e9470b0e6d56d. 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/6094d43b-d88c-4f30-b630-90c5a7a68d61.json and https://artists.proofprofile.net/proofs/artist/6094d43b-d88c-4f30-b630-90c5a7a68d61.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).