The string of safety must be tightened. The pledged assets are the fuse; if it burns out, the circuit will trip. Yet there are always those who want to cut the fuse, using tricks to forge proof. Lagrange said there are confiscation knives, but no matter how fast the knife, it still fears the hand in the dark. In the world of blockchain, it is hard to guard against; if this string relaxes for a moment, the platform may collapse.