anchor.diff:  -export([start_link/3,
            stop/1,
            continue/1,
  -         get_metadata/1]).
  +         get_metadata/1,
  +         get_next_chunk/1]).
   
   %% exported to be used by
   %% spawn_link
  
positive.code:          prepare/2,
           waiting_value/2,
           waiting_metadata_request/3,
           waiting_chunk_command/2,
           waiting_chunks/2,
           handle_event/3,
           handle_sync_event/4,
           handle_info/3,
  
negative.code:                 key :: term(),
                  value_cache :: binary(), 
                  metadata_cache :: term(), 
                  chunk_queue :: term(),
                  reply_pid :: pid(),
                  manifest :: term(),
                  blocks_left :: list(),
  