Bank secrecy laws are a species of financial privacy laws whose purpose is to establish statutory obligations and duties between a banker and his customer. Other species of financial privacy laws include structural banking forms and impediments and blocking statutes. Structural banking forms and impediments include use of "anonymous (also known as numbered) accounts and accounts held under false names. An anonymous account is used when an account holder signs an agreement with a personal bank agent agreeing to the conditions of the relationship and receives a number or pseudonym."
G. P. Rutledge, United States, 14 Penn St. Int'l L. Rev. 601 (1996).