In 2008, the mysterious hacker SatoshiNakamoto, in a paper published by the encryption technology email group at the Massachusetts institute of technology, simultaneously proposed two great inventions in the future: one is Bitcoin and the other is Blockchain. The latter, as the underlying technology of the former, was codified with the former one year after the concept was proposed. Seven years on, Bitcoin has become the world's largest cryptocurrency by market capitalization and recognized as a valuable digital asset in every country, with a total market capitalization of nearly $12 billion, but its controversy has never ceased.