XZC (zcoin) has been renamed Firo (Firo). XZC is a cryptocurrency that uses zerocoin protocol to protect accounting privacy. It is the first cryptocurrency that implements the zero currency protocol. By using zero knowledge proof, it ensures that the relevant address information of both parties to the transaction is not leaked. Zcoin is developed by the R & D team led by poramin and aizensou. It protects the accounting privacy through the zerocoin protocol and uses zero knowledge proof to ensure that the relevant address information of both parties to the transaction is not leaked. Its parameters are the same as those of bitcoin. The block output time is 10 minutes, and the output halving cycle is the same as that of bitcoin. It is halved every four years. XZC will be halved in September, 2020. After halving, the block reward will be 6.25xzc. Compared with the early mixed coin technology and ring signing technology that realized the anonymous function, the zero coin protocol of zero knowledge proof solves the shortcomings of the former two and completely cuts off the connection between the minted coin and the redeemed coin. When you forge a coin, you also destroy a coin, and a certificate will be generated to prove that you burned a coin. This certificate only confirms that you burned a change, but it doesn't need to prove which one you burned. Then by using this proof, you can redeem a brand-new coin without any trading history.