Double-proposing refers to a situation where a [[Validators|validator]] proposes more than one block for the same slot or height in the blockchain. This is considered malicious behavior because it can lead to [[Forks|forks]] in the network and disrupt consensus. >Double-proposing could potentially include conflicting transaction details or smart contract executions. It is essentially an attempt by a validator to manipulate or exploit system rules for personal gain at the expense of network integrity. To prevent this and maintain security on [[Proof of Stake]] chains, protocols often implement [[Slashing|slashing]] conditions that penalize validators who try to propose multiple blocks for the same slot. Slashing penalties usually involve loss of staked assets and can also lead to potential ejection from their role as validators, depending on the severity of the attack and whether it is a coordinated event.