ss='kw'>unless</span> <span class='id identifier rubyid_balance'>balance</span><span class='period'>.</span><span class='id identifier rubyid_is_a?'>is_a?</span><span class='lparen'>(</span><span class='const'><span class='object_link'><a href="../Coinbase.html" title="Coinbase (module)">Coinbase</a></span></span><span class='op'>::</span><span class='const'><span class='object_link'><a href="Balance.html" title="Coinbase::Balance (class)">Balance</a></span></span><span class='rparen'>)</span>

  <span clas