Mairy () is a former commune in the Ardennes department in northern France. On 15 September 2015, Mairy was annexed by the commune of Douzy. Arrêté n°2015-492 du 15 septembre 2015 portant création d'
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 0x27b2c47699128f0c9a521588eaf8bf11b275f8b0e703111a7b163071afb0f93d. 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/51179215-26ff-4337-90d4-425d7f077e8a.json and https://artists.proofprofile.net/proofs/artist/51179215-26ff-4337-90d4-425d7f077e8a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).