12. A method comprising: issuing, from a third party, a client set of tokens to a client; issuing, from the third party, a verification set of tokens to a provider; receiving a request from the provider to redeem a provider set of tokens; comparing the provider set of tokens with the client set of tokens; and selectively redeeming the provider set of tokens based on the results of the comparing.
12. A method comprising: issuing, from a third party, a client set of tokens to a client; issuing, from the third party, a verification set of tokens to a provider; receiving a request from the provider to redeem a provider set of tokens; comparing the provider set of tokens with the client set of tokens; and selectively redeeming the provider set of tokens based on the results of the comparing. 16. The method of claim 12 , wherein the selectively satisfying of the request includes redeeming the provider tokens if the provider set of tokens matches the client set of tokens.