XPM
Be your own bank - safest and most popular wallet
Hardware Wallet
Hardware Wallet
Hardware Wallet
Primecoin, or XPM, involves a new type of proof-of-work based on searching for prime numbers. Primecoin was created by Sunny King - who also created Peercoin. The block time is one minute and th total number of coins is 3299976 with dynamic difficulty retargetting.