ZCoin XZC: Sigma Protocol on Testnet
Zcoin has also been working to implement the Sigma protocol to replace Zerocoin. Sigma will be launched on our testnet on 17 April 2019.
A testnet is an alternative cryptocurrency blockchain, to be used for testing. Testnet coins are separate and distinct from real coins, and are not supposed to have any value. This allows application developers to experiment without resorting to using real coins and not worrying about the integrity and security of the mainnet.