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Bitcoin Simplified

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What is Bitcoin ? How do I get Bitcoin ? What is the worth of Bitcoin ?         First of all, to know bitcoin, we should know why do we need bitcoin? or what is the need of bitcoin? we do have a currency system, right? so what is the need for bitcoin? Well lets get started! Let us consider two friends, friend X & Y. X needs pen from Y, and Y has two pens so he gives one pen to X and now X has one pen and Y has one pen! This is known as physical transaction which is build on trust. Keep this word in mind TRUST "ok", we gonna need it below. Now, let's get digital, as we live in digital age! Now consider X needs pen from Y and Y has two digital pen and he sends one digital pen to X. Now both X and Y have one digital pen. Isn't  it so simple, Right? But how do you know that the digital pen Y send you it's now yours ? Think about it for a second , I know it's complicated like your relationship ! How do you know that Y hasn't send that s