Function ethash::quick_get_difficulty

pub fn quick_get_difficulty(
    header_hash: &[u8; 32], 
    nonce: u64, 
    mix_hash: &[u8; 32], 
    progpow: bool
) -> [u8; 32]

Difficulty quick check for POW preverification

header_hash The hash of the header nonce The block’s nonce mix_hash The mix digest hash Boundary recovered from mix hash