Kahit noon pa po gusto na nila gumawa ng digital cash pero madaming nagfailed. Lahat sila ay centralized yung system, so naisip ni Satoshi Nakamoto na gumawa ng digital cash na completely decentralized. At yon, nag succeed po sya. Kahit na malaking sugal yung gumawa ng non trust based system, mukhang imposible pero ginawang posible ni (Sir) Satoshi. May nabasa din po ako noon na ang bitcoin (cryptocurrency) is not protected/secured by people or by trust, but by math. Kaya siguro madami ding tao ang tiwala sa bitcoin.