The securities so deposited with the state treasurer shall be an exclusive trust for the benefit of the employees of the employers whose compensation liability is so secured, to remain with the treasurer in trust to answer any default of any employer, self-insured employer or surety upon any such obligation established by final judgment upon which execution may lawfully be issued against the employer or surety; the surety, however, at all times shall have the right to collect the interest, dividends and profits upon the securities, and from time to time to withdraw the securities or a portion thereof, substituting therefor others of equally good character and value, to the satisfaction of the commission, and the securities shall not be sold under any process against the surety until after thirty (30) days’ notice to the surety, supplying the date, place and manner of sale, and the process under which and the purpose for which the sale is to be made, accompanied by a copy of the process. The surety shall not be permitted to withdraw from the state treasurer the deposits of money or bonds or permit the surety bonds to lapse for a period of one (1) year after discontinuing business within this state, or while any suit is pending or while any judgment against the surety in this state, or award against an employer whose compensation liability is secured by the surety, shall remain unpaid. Securities which are used to satisfy the requirements of this chapter may be held in the federal reserve book-entry system, as defined in section 41-2870(4), Idaho Code, and interests in such securities may be transferred by bookkeeping entry in the federal reserve book-entry system without physical delivery of certificates representing such securities.