Okla. Stat. tit. 19 § 622
The county treasurers shall be covered by the county blanket bond and it shall run to the state, and action may be brought thereon in the name of the state, for the use and benefit of the person or persons injured by a violation thereof. In the event of defalcation by the county treasurer no surety shall be required to pay a greater portion of such loss than the ratio which its bond bears to the total bond required for the treasurer. Such bond for the county treasurer in each county as set by each board of county commissioners shall be in the aggregate sum of not less than Fifty Thousand Dollars ($50,000.00).
Any surety or sureties on the bond of such county treasurer may at any time examine into, investigate and audit the books and records of such county treasurer for the purpose of determining whether said treasurer has performed the duties of his office faithfully and according to law and may, when such surety or sureties deem themselves insecure, upon thirty (30) days' written notice given to the board of county commissioners, withdraw and cancel their obligations as surety or sureties on such bond.
Okla. Stat. tit. 19, § 622