mmrApi: {
      /**
       * Generate MMR proof for the given block numbers.
       **/
      generateProof: AugmentedCall<ApiType, (blockNumbers: Vec<BlockNumber> | (BlockNumber | AnyNumber | Uint8Array)[], bestKnownBlockNumber: Option<BlockNumber> | null | Uint8Array | BlockNumber | AnyNumber) => Observable<Result<ITuple<[Vec<MmrEncodableOpaqueLeaf>, MmrBatchProof]>, MmrError>>>;