Blank endorsement is a kind of signature on a financial instrument. It has no designated payee, so the person who possesses it can demand payment, for example, a check made payable to cash and endorsed on the back with the signature of the account held. The blank endorsement essentially makes the financial instrument into a bearer paper. The risk of a blank endorsement is that if it is lost or stolen, the finder can cash or deposit it.
[Last updated in February of 2022 by the Wex Definitions Team]