anchor.diff:  get_mining_workers() ->
       gen_server:call(?SERVER, get_mining_workers).
   
  --spec handoff_leader() -> 'ok'.
  -handoff_leader() ->
  -    gen_server:call(?SERVER, handoff_leader).
  +-spec is_leader() -> boolean().
  +is_leader() ->
  +    gen_server:call(?SERVER, is_leader).
   
   %%%===================================================================
   %%% Chain API
  
positive.code:     {reply, State#state.mining_state, State};
  handle_call(get_mining_workers, _From, State) ->
      {reply, worker_pids_by_tag(mining, State), State};
  handle_call(reinit_chain, _From, State1 = #state{ consensus = Cons }) ->
      %% NOTE: ONLY FOR TEST
      ok = reinit_chain_state(),
  
negative.code:         , get_mining_workers/0
          , start_mining/0
          , stop_mining/0
          , is_leader/0
          , get_beneficiary/0
          ]).
  
  