Kira supports any digital asset, you can stake crypto, digital fiat, stablecoins and even NFTs, this mechanism was choosen because it does not limit value that can be staked compared to other PoS chains which have only one asset on their network. Also thanks to MBPoS you can use Kira and other DeFi's at the same time because this consensus supports staking derivatives. And this consensus is great because its secured by multiple assets and it works in a way that the more assets are deposited and at stake the more secure our network becomes which is the totally opposite of other proof of stake chains.