Zcash (CRYPTO: ZEC) has bounced 45% from last week’s $300 low to $437 after developers proposed an upgrade to fix the counterfeiting bug, while XRP

Zcash dropped 38% after disclosing a four-year-old counterfeiting vulnerability in its Orchard shielded pool. Arthur Hayes exited his entire ZEC position.

The plan would let anyone verify that no counterfeit coins are circulating, addressing the patched bug that triggered last week's crash. ZEC is still down about 22% on the week.