Tossin is a commune in the Baskouré Department of Kouritenga Province in the Centre-Est region of Burkina Faso. It had a population of 951 in 2006. Demographics YearPopulation198567719969962006951
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 0x4a21741495cb77f84f3f91f822e52de0f3981752ef01b4ce80c67450a0178c8b. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f2b3a825-32d8-41c0-8d1e-e314be3e2ee3.json and https://artists.proofprofile.net/proofs/artist/f2b3a825-32d8-41c0-8d1e-e314be3e2ee3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).