RSA 383-B:4-403 Assignments.

(a) No assignment of a deposit which is evidenced by a passbook or certificate of deposit shall be a valid transfer of the deposit unless the passbook or certificate of deposit is delivered to the assignee accompanied by a written assignment or order for transfer.
(b) No assignment of a deposit, however evidenced, shall be effective to charge the depository bank in which the deposit is maintained with a duty of payment to the assignee prior to service by the assignee on the depository bank of written notice of the assignment. No depository bank shall be liable to an assignee of a deposit maintained in that bank for any payment of the deposit or portion thereof or dividend or interest thereon made to the depositor prior to service on the depository bank by the assignee of the w