A computer system comprises a communications module; a processor coupled to the communications module; and a memory coupled to the processor, the memory storing processor-executable instructions which, when executed, configure the processor to receive, via the communications module, a signal that includes an ownership key associated with a digital asset minted on a payment card network; store the ownership key associated with the digital asset in a digital wallet; send, via the communications module and to the payment card network, a signal that includes a request to perform an action on the digital asset using the ownership key; receive, via the communications module and from the payment card network, a signal that indicates permission for the action to be performed on the digital asset; and perform the action. Automatic anomaly detection may be performed.