Constant keccak_hash::KECCAK_EMPTY_LIST_RLP

pub const KECCAK_EMPTY_LIST_RLP: H256 = H256([29, 204, 77, 232, 222, 199, 93, 122, 171, 133, 181, 103, 182, 204, 212,
      26, 211, 18, 69, 27, 148, 138, 116, 19, 240, 161, 66, 253, 64, 212, 147,
      71])

The KECCAK of the RLP encoding of empty list.