Abstract: A system for performing a coordinated transaction is disclosed, involving a digital asset transaction performed on a blockchain and a payment transaction performed at a payment processing system. The system comprises a blockchain subsystem arranged to interface with the blockchain and to execute a main workflow process including the digital asset transaction and an interface to the payment processing system. A plurality of interface operations are provided which can be invoked by the main workflow process. Each operation is arranged to communicate via the interface with the payment processing system to control execution of a respective stage of the payment processing transaction at the payment processing system; and to maintain on the blockchain minor transaction data tracking a status of the payment processing transaction at the respective stage. The system is further configured to synchronize execution of the digital asset transaction with the payment transaction using the interface operations.

Abstract: A payment transaction system including a payment authentication token associated with a customer; and a payment platform associated with the authentication token, the payment platform storing a stored value payment account having a pre-paid stored value and information corresponding to a plurality of linked funding accounts. In response to a transaction authentication performed by the authentication token and transaction data associated with the transaction, the payment platform selects the stored value payment account or a linked account, and settles the transaction with the selected account.