This was Zcoin, not Zcash. Multiple critical bugs have been found in Monero, eg. https://getmonero.org/2017/05/17/disclosure-of-a-major-bug-in-cryptonote-based

This was Zcoin, not Zcash. Multiple critical bugs have been found in Monero, eg. https://getmonero.org/2017/05/17/disclosure-of-a-major-bug-in-cryptonote-based-currencies.html https://getmonero.org/2017/05/17/disclosure-of-a-major-bug-i...