Well, at least we can minimize the period when the keys are not ours. If we keep the coins only for a few days on the exchange, it is unlikely that the exchange

Well, at least we can minimize the period when the keys are not ours. If we keep the coins only for a few days on the exchange, it is unlikely that the exchange falters just during that time. But if we keep it for years, it is likely we will lose it eventually.