By proof-of-work mechanism. Here I dug up the explanation of the Satoshi himself: http://www.mail-archive.com/cryptography@metzdowd.com/msg09997.html http://w

By proof-of-work mechanism. Here I dug up the explanation of the Satoshi himself: http://www.mail-archive.com/cryptography@metzdowd.com/msg09997.html http://www.mail-archive.com/cryptography@metzdowd.com/msg099...