With any account, any number of pledges can be made against the validator to support a validator and share the mining proceeds. If you want to retrieve the system Token that has been pledged, you need to send a declarative transaction to the system contract to unstake. After waiting for a period of time, the system contact is called again to withdraw the pledge and retrieve the pledged system Token. Punishment: when it is found that the validator has not produced the block in advance, it will automatically call the system contract at the end of the block to count the validator. When the count reaches the forfeiture threshold, all the validator's income is forfeited. When the count reaches the removal threshold, the validator will be removed from the active validator list and will be disqualified.