Proof of Work Cryptocurrency - The Nonce

The nonce, as I understand it, really becomes relevant when you talk about mining. So in a proof of work blockchain, to prove that you have done work, there's some hashing algorithm. And you take one constant, which is the block, and then you have the nonce. It can be really be any arbitrary, like you have six ones at the start of your hash,. Usually it's just a number of zeros that determines your difficulty.