The NNS canisters come with a builtin ledger for ICP transfers. However, other tokens will need to handle their own ledgers, there is no standard yet but I put some ideas in this thread.
              
              
              3 Likes
            
            
          The NNS canisters come with a builtin ledger for ICP transfers. However, other tokens will need to handle their own ledgers, there is no standard yet but I put some ideas in this thread.