Vitalik Buterin: @jasonhuan_ 根据定义，从 [0…2^256-1] 到 [0…2^256 – 2] 的函数不可能在任何地方都真正可逆；必须有一些 x 无法计算 f(x)，或者一些 f(x) = f(y) 碰撞。我希望这些不可避免的异常在计算上是不可行的。

原推：@jasonhuan_ By definition, a function from [0…2^256-1] to [0…2^256 – 2] can’t be truly invertible everywhere; there has to be some x where f(x) can’t be computed, or some f(x) = f(y) collision. I want these unavoidable exceptions to be computationally infeasible to discover.
https://twitter.com/VitalikButerin/status/1516319708303269892