 The important thing to realize is that security in Bitcoin is an emergent property that exists... because of the decentralization of control and power. If I want to hack a million customers' Bitcoin and they are holding their keys, I have to hack a million customers. If they all give their keys to one person or one organization, then we have a honeypot. A honeypot that attracts the attention of every hacker on the planet. Notice what has happened over seven years, and with a market capitalization of $12 billion, Bitcoin is the largest cryptographic deployment in the world. The largest public key infrastructure in the world, the largest security honeypot in the world. It is secure because it generates immunity by being attacked all the time. Twenty-four hours a day by the most sophisticated attackers this planet has.