US Patent 8645685 Token authentication

Methods and devices are described that authenticate portable tokens, such as plastic tokens used in casinos on card tables. The systems and methods assign authentication data to a token. The authentication data is verified when a person tries to redeem value on the token. A person's authentication data may be acquired via an interface provided by a gaming machine, for example, and the authentication data stored so that the authentication information is later be read when someone tries to redeem value on the token. Only a person who presents the tokens and authentication data could then negotiate such tokens.