> Although these two weaknesses have been known to Monero’s developers since 2015, it was not until February 2017, when Monero’s implementation was modified, th

> Although these two weaknesses have been known to Monero’s developers since 2015, it was not until February 2017, when Monero’s implementation was modified, that these concerns were addressed, thus making post hoc de-anonymization more difficult. According to the researchers, transactions prior to this date are at significant risk of being identified.