The official registrar shall (a) act as transfer agent or registrar for the exchange or transfer of registered public obligations or maintain the records so that public obligations in book-entry form may be effected, or (b) contract with or otherwise designate a bank, trust company or other person to act as transfer agent or registrar for the registered public obligations or maintain the records so that public obligations in book-entry form may be effected. The bank, trust company or other person may include the federal government or any of its agencies or instrumentalities and may be located or have its principal office within or without the state. Public obligations in book-entry form shall be effected by means of entries on the record of the official registrar or his designee which shall reflect the description of the issue, the principal amount, the interest rate, the maturity date and the owner of the public obligation and other information as is considered by the official registrar or his designee to be appropriate. The official registrar or his designee may effect conversion between book-entry public obligations and registered public obligations for owners of public obligations who request a change. The official registrar or his designee shall issue a confirmation of the transaction in the form of a written advice. The official registrar or his designee shall have such additional powers as are necessary to effectuate the purposes of this article.