Khadra is a town and commune in Mostaganem Province, Algeria. It is located in Achacha District. According to the 1998 census it has a population of 12,294. References Category:Communes of Mostagane
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 0xf8f0dab5782877ced8fd04d0ab3ada925047bf1d4a5f3cedffd91368ffb51ba3. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c711be90-a883-4e55-a668-e9b4c229b030.json and https://artists.proofprofile.net/proofs/artist/c711be90-a883-4e55-a668-e9b4c229b030.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).