Privacy-focused cryptocurrency Zcash fixed a flaw last year that could have allowed an attacker to produce counterfeit currency. The flaw, only revealed this week, existed for two years until the projects technical team fixed it in October 2018. Zcash was already planning a new version of its network called Sapling with a new public key, which would be generated by a new MCP ceremony. But while the ceremony may have been secured, there was a vulnerability in the cryptographic algorithm itself. It enabled someone to make a zero knowledge proof of one transaction look as though it was proving another.”]