GBBK Global Blockchain Acquisition Corporation

Greater Bay Bancorp (Nasdaq: GBBK), a financial services holding company, will hold a special meeting of shareholders on Wednesday, September 26, 2007, at 9:30 a.m., to vote on a proposal to approve and adopt an agreement and plan of merger between Greater Bay Bancorp and Wells Fargo & Company. The record date for determining shareholders eligible to vote at the special meeting has been set for August 13, 2007. The Company expects to mail the proxy statement-prospectus for the meeting on or about August 20, 2007. About Greater Bay Bancorp Greater Bay Bancorp, a diversified financial services holding company, provides community banking services in the greater San Francisco Bay Area through the Greater Bay Bank, N.A. community banking organization, including Bank of Petaluma, Coast Commercial Bank, Golden Gate Bank, Mid-Peninsula Bank, Mt. Diablo National Bank, Peninsula Bank of Commerce and Santa Clara Valley National Bank. Nationally, Greater Bay Bancorp provides specialized leasing and loan services through its specialty finance group, which includes Matsco, CAPCO and Greater Bay Capital. ABD Insurance and Financial Services, the Company's insurance brokerage subsidiary, provides commercial insurance brokerage, employee benefits consulting and risk management solutions to business clients throughout the United States. For additional information and press releases about Greater Bay Bancorp, visit the Company's web site at http://www.gbbk.com. Safe Harbor This document may contain forward-looking statements that are subject to risks and uncertainties that could cause actual results to differ materially from those projected. For a discussion of factors that could cause actual results to differ, please see the publicly available Securities and Exchange Commission filings of Greater Bay Bancorp, including its Annual Report on Form 10-K for the year ended December 31, 2006 and particularly the discussion of risk factors within such documents. More Information About the Merger and Where to Find It The proposed merger will be submitted to Greater Bay Bancorp's shareholders for their consideration. On July 10, 2007, Wells Fargo filed a registration statement with the Securities and Exchange Commission (SEC), which included a preliminary proxy statement-prospectus describing the merger. Greater Bay Bancorp will mail the definitive proxy statement-prospectus when it is available. Shareholders of Greater Bay Bancorp and other investors are urged to read the registration statement and proxy statement-prospectus (and any amendments or supplements to those documents, including the definitive proxy statement-prospectus) when they become available, as well as other relevant documents filed with the SEC, because they will contain important information. The registration statement and preliminary proxy statement-prospectus are, and the definitive proxy statement-prospectus will be, available free on the SEC's website (http://www.sec.gov). In addition, Wells Fargo and Greater Bay Bancorp will provide free copies of the proxy statement-prospectus, and any SEC filings incorporated by reference into that document, upon request as follows: Wells Fargo & Company, Attention Corporate Secretary, MAC N9305-173, Sixth and Marquette, Minneapolis, Minnesota 55479, 612-667-8655. Greater Bay Bancorp, Attention Corporate Secretary, 1900 University Ave., Sixth Floor, East Palo Alto, California 94303, 650-838-6109. Wells Fargo and Greater Bay Bancorp and their respective directors and executive officers may be deemed to be participants in the solicitation of proxies from Greater Bay Bancorp shareholders in connection with the proposed merger. Information about Wells Fargo's directors and executive officers and their ownership of Wells Fargo common stock is set forth in the definitive proxy statement for Wells Fargo's 2007 annual meeting of stockholders, as filed by Wells Fargo with the SEC on Schedule 14A on March 16, 2007. Information about Greater Bay Bancorp's directors and executive officers and their ownership of Greater Bay Bancorp common stock is set forth in the definitive proxy statement for Greater Bay Bancorp's 2007 annual meeting of shareholders, as filed by Greater Bay Bancorp with the SEC on Schedule 14A on April 20, 2007. The proxy statement-prospectus for the proposed merger will provide more information about participants in the solicitation of proxies from Greater Bay Bancorp shareholders.