Constant grin_core::consensus::UNIT_DIFFICULTY

pub const UNIT_DIFFICULTY: u64 = ((2 as u64) << (SECOND_POW_EDGE_BITS - BASE_EDGE_BITS)) * (SECOND_POW_EDGE_BITS as u64); // 1_856u64

unit difficulty, equal to graph_weight(SECOND_POW_EDGE_BITS)