Swiss State-Owned Bank PostFinance Expands in Crypto With Ethereum Staking Swiss state-owned bank PostFinance AG expanded its digital-asset offering by introducing staking, allowing holders of the second-biggest cryptocurrency Ether to earn passive income. PostFinance will add staking for other tokens in the “near future,” according to a statement on Thursday. Staking refers to the practice of pledging cryptoassets to validate blockchain transactions and earning more tokens.