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Bitcoin (abbreviation: BTC; sign: ₿) is the first decentralized cryptocurrency. Nodes in the peer-to-peer bitcoin network verify transactions through cryptography and record them in a public distributed ledger, called a blockchain, without central oversight.
Shuman Ghosemajumder, co-founder of TeachAids, former click fraud czar at Google; Jawed Karim, software engineer, co-founder of YouTube, early employee of PayPal; Samarendra Kumar Mitra, designed, developed, and constructed India's first indigenous computer in 1953 (an electronic analog computer)