Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:One of our proposed protocol is based on gossip protocols for completely decentralized distributed applications, such as an environment of [19] and guarantees causal message ordering, which is somewhat similar to temporal message ordering [12], based on logical time not physical time.
Category: