Nana Tuffour ( James Kwaku Tuffour; 14 February 1954 – 15 June 2020), also known as 9-9-2-4, was a Ghanaian Highlife singer and songwriter. He is known for popular highlife songs such as Aketekyiwa, A
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 0x7cfe2d1bc8c4ffadf89e36e6273e1b577395854aac651fa82b9391302d70ba28. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8a5ea826-46f5-4e34-936c-0b5adbd42c11.json and https://artists.proofprofile.net/proofs/artist/8a5ea826-46f5-4e34-936c-0b5adbd42c11.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).