Every instrument of transfer presented for registration shall be left at the office of the Bank accompanied by a certificate of the shares to be transferred, and such other evidence as the Bank may require to prove the title of the transferor or his or her right to transfer the shares. Every power of attorney given by a shareholder authorising the transfer of shares, shall, when lodged, produced or exhibited to the Bank, be deemed as between the Bank and the donor of the power to continue and remain in full force and effect, and the Bank may allow the same to be acted upon until an express notice in writing of the revocation of the same has been given to the Bank.