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 I'd argue opening a lightning channel is staking it to the other node. You're locking funds into a time lock contract between you and that other party. This is just adding an incentive layer to that staking process. 
 Your bitcoin is not staked. You're exchanging channel state that can always be taken to the main chain.  
 I think this is a semantics arguement but I'm not sure. Stake based chains can usually revoke the staking process as well. When a party would close the channel the software would just update the relay software to stop offering the incentive. Call it staking or liquidity incentives or whatever else but seems like the same result to me. 
 Lightning allows for unilateral exits from the channel. It is not staking.  
 How does that disqualify it from being staking though? This is a normal function of staking