David Alechenu Bonaventure Mark (; born 8 April 1948) is a retired Nigerian army brigadier general and politician. He served as the 12th president of the Nigerian Senate from 2007 to 2015 and was 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 0xfd582f3a8e7465c30d49838c44a1a892a9f15240a341afe6a565014479e4ff50. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/815034ff-8d40-4070-b1a0-af7a11d24b17.json and https://artists.proofprofile.net/proofs/artist/815034ff-8d40-4070-b1a0-af7a11d24b17.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).