Systems and methods for blockchain based payment networks — USPTO — “A system, method, and computer readable medium (collectively, the ‘system’) is disclosed for a payment network using a blockchain-based ledger that is configured to execute payment transactions in response to blockchain requests… In various embodiments, the system may assess a risk associated with the transaction. The system may also approve the transaction in response to the risk associated with the transaction being acceptable. The system may also transmit a notification (eg a push notification) to the payee digital wallet that the transaction was successful.”