Ring Repetition

Case

Typical situation without any filters applied yet

Apply filter

The so-called ring repetition method uses multiple appearances of the same ring to identify spent outputs. This method simply identifies a collection of n separate n-rings containing the same outputs, where we can conclude that the ring is spent. This analysis was initially presented as semi-cooperative attack, where an adversary generates ring repetitions of controlled outputs to signal to other adversarial users that the ring is spent. See this paper