Method IsUnspendable

src/script/script.h:564–567

* Returns whether the script is guaranteed to fail at execution, * regardless of the initial stack. This allows outputs to be pruned * instantly when entering the UTXO set. */

     * instantly when entering the UTXO set.
     */
    bool IsUnspendable() const
    {
        return (size() > 0 && *begin() == OP_RETURN) || (size() > MAX_SCRIPT_SIZE);
    }

    void clear()
    {