The Antenne () is a 49.0 km long river in the Charente-Maritime département, in southwestern France. Its source is in the commune of Fontaine-Chalendray. It flows into the Charente near Cognac. Refer
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 0xf5eb6adc8c0b56de6897b81a5120a427f87eac15af2090169c3b237bc964a1f8. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/08d7d445-774c-469c-a945-c9d944206d29.json and https://artists.proofprofile.net/proofs/artist/08d7d445-774c-469c-a945-c9d944206d29.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).