A deposit is a special deposit if it is:
1. A deposit of funds in a bank or credit union 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 stated in the account agreement; and 5. Subject to a contingency.