'Sealed' in the Bible

I subscribed the deed, and sealed it, and called witnesses, and weighed him the money in the balances.

So I took the deed of the purchase, both that which was sealed, containing the terms and conditions, and that which was open;

Thus says Yahweh of Armies, the God of Israel: Take these deeds, this deed of the purchase which is sealed, and this deed which is open, and put them in an earthen vessel; that they may continue many days.