You need to keep your wallet open and connected to the network. It will validate transactions and you will receive a transaction fee. More you've got = you validate more = you earn more. That's how I understand it.
There's a big risk involved with losing most of your wallet in certain situations hence why I'm not interested in PoS.
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There's a big risk involved with losing most of your wallet in certain situations hence why I'm not interested in PoS.