A bank confirmation letter (BCL) is a correspondence between banks that confirms the existence of a valid line of credit to one of its customers. The verification letter must have a customer's account number, name, outstanding balance, opening date, and bank's name and address.Bank Confirmation Letter-1 - Free download as Word Doc (. A bank confirmation letter (BCL) is a letter from a financial institution validating that a borrower has an existing loan or line of credit. Edit Letter of Confirmation Online for Free and Download. Fill out this bank confirmation letter on Lawrina and download a fully customized PDF document, ready for resolving your legal matters. 64 votes, 331 comments. I received a letter from Wells Fargo concerning them enrolling me in a program I did not authorize back in 2008. Open an account at Laxmi Sunrise Bank anywhere just in the matter of a few clicks! Primary Identification.