Type Definition darwinia_ecdsa_authority::pallet::PreviousMessageRoot

pub type PreviousMessageRoot<T: Config> = StorageValue<_GeneratedPrefixForStoragePreviousMessageRoot<T>, (T::BlockNumber, H256), OptionQuery>;

Record the previous message root.

Use for checking if the message root getter get the same message root as the previous one. And if this is empty, it means the message root is require to be relayed.