Wis. Stat. § 24.19: Certificate of sale.

All original and duplicate certificates of sale issued under s. 24.17 shall be properly numbered, and the original shall be filed in the office of the board. As many distinct lots or tracts of land purchased by one person in one section at the same time as that person requests shall be included in one certificate or one patent, as the case may be. Certificates of sale may be acknowledged and recorded in the same manner as deeds. Certificates of sale may be assigned in writing. The assignment may be acknowledged and recorded in the same manner as deeds, and the assignee shall have the same rights and remedies under the certificate as the original purchaser would have had.