Iowa Code § 584.2: Requirements of bond.

Said bond shall be in an amount equal to twice the amount of the lien claimed, shall have one or more sureties, shall be approved by and filed with the clerk of the district court of the county where the property is being held under the claimed lien, and shall be conditioned to pay claimant any sum found to be due and also found to have been a lien on said property at the time the bond is filed.