Which block size has nav?
1MB like bitcoin or more?

In addition to the optional anonymous transaction service, Nav Coin’s biggest strength is it’s super fast network speed. It’s no secret that Bitcoin has an average transaction time of 10 minutes, with transactions over heavy periods taking much longer. With a block time of 30 seconds combined and a scalable block size of up to 20MB, the Nav Coin network is able to handle 1300 transactions per second.