# Assays in ERTP
An Assay represents the identity of an issuer. Holding an Assay provides the ability to create
units and empty purses, but confers no rights. It is also the mechanism used to get exclusive access to a Purse or Payment that you already hold, or to burn some or all of the contained rights.
# Other Definition
As a noun, assay means a test or appraisal to determine the components of a substance or object. As a verb, it refers to the act of analyzing, or of conducting that test.