A system and method of accessing a service on a terminal node. The system includes a chain of nodes, the chain comprising a first node, one or more intermediate nodes, and the terminal node, the terminal node maintaining the service, wherein the first node is arranged to initiate an access request and to transmit the access request to an adjacent node, each intermediate node is arranged to authenticate the transmitting node and to transmit the access request to an adjacent node, and the terminal node is arranged to authenticate the transmitting node and to execute the access request.