As AI and blockchain reshape the world, data has become the new oil, but our privacy is slipping through our fingers like sand. Privacy computing is like a "magic show" in the digital age - it allows data to be used without being seen. Among them, the "black technology" of zero-knowledge proof is the most magical: it is like being able to prove that you know the password without actually saying it. This is not a simple technological upgrade, but it is about whether we can retain the last bit of human dignity of "not lying but being able to choose silence" in a world dominated by algorithms.