A deposit is a special deposit if it is:
1. A deposit of funds in a bank under an account agreement.
2. For the benefit of at least two beneficiaries, one or more of which may be a depositor.
3. Denominated in a medium of exchange that is currently authorized or adopted by a domestic or foreign government.
4. For a permissible purpose as stated in the account agreement; and
5. Subject to a contingency.