Obo is the capital of Haut-Mbomou, one of the 20 prefectures of the Central African Republic. It is close to the African Pole of Inaccessibility, the point of the continent furthest from the sea, abou
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 0xc8e77e6087ee10e6856ede5fb9d4aa4fef651b69ee5edfd5e7689f856343672f. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e321abb0-1b7e-4332-903f-54612ce1bbdf.json and https://artists.proofprofile.net/proofs/artist/e321abb0-1b7e-4332-903f-54612ce1bbdf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).