39 C.F.R. § 761.2
Each Reserve Bank is hereby authorized, in accordance with the provisions of this part, to (a) issue book-entry Postal Service securities by means of entries on its records which shall include the name of the depositor, the amount, the loan title (or series) and maturity date; (b) effect conversions between book-entry Postal Service securities and definitive Postal Service securities; (c) otherwise service and maintain book-entry Postal Service securities; and (d) issue a confirmation of transaction in the form of a written advice (serially numbered or otherwise) which specifies the amount and description of any securities; that is, loan title (or series) and maturity date, sold or transferred, and the date of the transaction.
39 C.F.R. § 761.2