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Bitcoin (often called BTC) is the world's first and most popular cryptocurrency — digital money that exists only online. Imagine sending cash to a friend across the world instantly, without banks, credit cards, or any middleman taking a cut. T…

Built as a second layer over the bitcoin network, it enables people to transfer Bitcoin between one another instantly and without any fees. This is made possible by creating payment channels between two users, and lightning can also make payments be…