A system and method for assigning a single use real-time privilege are disclosed. A processor validates credentials of a user based on comparing credentials data of the user with pre-stored reference data in response to receiving a request to access a target computer to execute a single process; creates a single use blockchain private key for the single process and generates the passcode in response to a successful validation of the credentials. The processor also writes request data corresponding to the private key and the passcode onto a blockchain. In response to receiving user login data and the passcode to access the target computer, the processor validates passcode by confirming that the passcode matches the request data wrote in the blockchain; and assigns a single use real-time privilege to the user for executing the single process in response to successful validation of both the passcode and the received request.