Honest answer first: nobody can give you a verified 12-month blow-up history for an anonymous copy trader, including us.
Exchanges publish a rolling 30-day window of daily performance. A blow-up from four months ago, followed by thirty calm days, is invisible in that window — to us, to you, and to any site claiming otherwise. If a rating site shows you a precise count of a trader's historical liquidations, the right question is where the number came from.
What we can do is start counting from the day we begin watching. We archive every tracked trader's daily curve, so from that point on a reset cannot hide, and the observation window on each profile grows daily and is stated openly ("archived since \<date\>, N days observed").
In the meantime, the closest proxy on a profile is the reconstructed drawdown and the worst single day. A trader who has never taken a −40% day in the period we have observed has at least not shown you that behaviour yet — which is a weaker statement than "zero blowups in 12 months", and it is the strongest one the data supports.