Zero Knowledge proofs take the place of a digital signature proving ownership of an address in Bitcoin.<p>Well, that&#x27;s explain like you&#x27;re a crypto undergrad. But, it&#x27;s a start.<p>There&#x27;s quite a lot of interesting cryptography and engineering involved in making this work; the last zerocash presentation I saw in 2014 mentioned they had been working on shrinking ZK proofs from 25k down to a manageable size for a blockchain.