On PoS blockchains like Ethereum 2.0, BSC, Solana, Cardano stakers are liable for making a upcoming block of transaction and relies on the level of tokens that validators use for a collateral. Block validation yourself is a relatively unrealistic enterprise, possibly on PoW or PoS networks. On PoW networks, https://financefeeds.com/sec-approves-options-trading-on-spot-ether-etfs/