Ambrose Campbell (19 August 1919 – 22 June 2006) was a Nigerian musician and bandleader. He is credited with forming Britain's first ever black band, the West African Rhythm Brothers, in the 1940s, an
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe04d35537d8ee6dc8a4b0ca6cb34e0a1e7fc9e4c942ff346839749a84e1cee6a. 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/d005483e-11e5-4eaf-a6ab-719be43a3c21.json and https://artists.proofprofile.net/proofs/artist/d005483e-11e5-4eaf-a6ab-719be43a3c21.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).