Black Uhuru is a Jamaican reggae group formed in 1972, initially as Uhuru (Swahili for 'freedom'). The group has undergone several line-up changes over the years, with Derrick "Duckie" Simpson as the
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 0xff7714bed5c4f92da7b8dcaa96c4405becf6c3ae9eaa88a57d0a8c3d5d79ab99. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f9308f84-5556-44f7-a280-be22d0482015.json and https://artists.proofprofile.net/proofs/artist/f9308f84-5556-44f7-a280-be22d0482015.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).