preimage: {
      preimageFor: AugmentedQuery<ApiType, (arg: ITuple<[H256, u32]> | [H256 | string | Uint8Array, u32 | AnyNumber | Uint8Array]) => Observable<Option<Bytes>>, [ITuple<[H256, u32]>]> & QueryableStorageEntry<ApiType, [ITuple<[H256, u32]>]>;
      /**
       * The request status of a given hash.
       **/