NavCoin Core 4.5.0 changelog:

* Adds support for Cold Staking Addresses.
* Signaled by version bit 3.
* Adds new RPC command getcoldstakingaddress.
* Wizard to create Cold Staking Addresses in the Receiving tab of the wallet.
* Updates several RPC commands to provide results relating to Cold Staking.
* Adds new RPC tests to test Cold Staking Address creation and use.
* Added a ‘Cold Staking’ balance display to the wallet GUI.

http://cryptocoindaddy.com/navcoin-core-4-5-0-released-upgrades-protocol-and-introduces-static-rewards/