Minn. Stat. § 513.07

Every agreement extending the time of payment for manual labor, performed or to be performed in cutting, hauling, banking, or driving logs, beyond the time of the completion of such labor, shall be void, unless such agreement, expressing the consideration, be in writing subscribed by the party to be charged therewith, and unless, at the time of making such agreement or completing such labor, the person for whom it is to be or has been performed deliver to such laborer a negotiable promissory note for payment of the agreed compensation, with interest. Every lien allowed by law on account of such labor shall pass by the transfer of such note, and be enforceable by the holder thereof.