Abstract: The present invention provides a system, computer program and method for recognizing users by creating one or more certificates and issuing the one or more certificates to a first user. Each certificate has a certificate identifier and the first user has a first user identifier. The certificate identifier and the first user identifier for each certificate issued to the first user are stored in a database. At least one of the certificates given to a second user having a second user identifier by the first user is redeemed and the second user identifier is stored with the certificate identifier in the database for each certificate given to the second user.