Bilongo is a surname of Central African origin. Notable people with the surname include: Blanche Bilongo (born 1974), Cameroonian actress, screenwriter, presenter, and film editor Bryant Bilongo (born
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 0x1424d66fac91a5d13aa95994dbc2dd0cc02d096198aa128eee35c1b0a233c760. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d619650a-e0cf-4b08-9edc-09a4e6ec1f5d.json and https://artists.proofprofile.net/proofs/artist/d619650a-e0cf-4b08-9edc-09a4e6ec1f5d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).