Hambol Region is one of the 31 regions of Ivory Coast. Since its establishment in 2011, it has been one of two regions in Vallée du Bandama District. The seat of the region is Katiola and the region's
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc143fc7b1c9476fc4f30694a88c35488d314b554d5a7bbeaf2e86cdac7f3b813. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/05c12951-f662-4e68-8991-e48c551875ec.json and https://artists.proofprofile.net/proofs/artist/05c12951-f662-4e68-8991-e48c551875ec.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).