def p2sh_sig(options)
      string = Script.new(options).to_s
      CoinOp.syncbit(@network[:name]) do
        Bitcoin::Script.binary_from_string("#{string} #{self.to_hex}")
      end
    end
def p2sh_sig(options)
      string = Script.new(options).to_s
      CoinOp.syncbit(@network[:name]) do
        Bitcoin::Script.binary_from_string("#{string} #{self.to_hex}")
      end
    end
Generate a P2SH script_sig for the current script, using the
 supplied options, which will, in the case of a multisig input,
 be {:signatures => array_of_signatures}.