Shielding funds from prying eyes has long been Zcash’s forte, but investors’ unease on Friday indicated that the privacy coin’s core feature can also resemble an Achilles' heel. Following the disclosure of a bug that had the potential to unleash a wave of counterfeit coins, Zcash tanked to its lowest point in over a month. The digital asset recently changed hands around $350, a 33% decrease over the past day, according to CoinGecko, after falling below $265 overnight.