Get rid of user keys in MintDemo

[garious]

Instead of storing those million keys in the JSON file, add a way to deterministically generate the from the Mint's seed key.

[rlkelly]

I'm thinking something like this would make sense:

struct PrivateKeyGenerator {
    curr: Vec<i32>,
    next: Vec<i32>,
}

impl Iterator for PrivateKeyGenerator {
    type Item = Vec<i32>;

    fn next(&mut self) -> Option<Vec<u32>> {
        let seed: &[_] = &[1, 2, 3, 4]; // maybe this is input or uses a default
        let mut rng: StdRng = SeedableRng::from_seed(seed);
        // then generate wallet
    }
}

What do you think?

[garious]

It'll be something like that. Just need to print that output locally and verify the keys are the same across runs.

[garious]

I think I'd skip the iterator part though. That's a clever solution though - just the sort of hack we need. A shame the ring library doesn't support something similar.