Fla. Stat. § 76.10

When the debt is not actually due, the motion shall state the amount of the debt or demand; that it is actually an existing debt; and the existence of one or more of the special grounds in s. 76.05, stating specifically the grounds and plaintiff shall produce before the officer granting the attachment satisfactory proof, by affidavit (other than his or her own) or otherwise, of the existence of the special ground.