Which of the following statements about the Bitcoin incentive mechanisms is INCORRECT: We may not be able to penalize the node that created the block with invalid transactions since the node does not...

Which of the following statements about theBitcoin incentive mechanisms is INCORRECT:

1. We may not be able to penalize the node that created the block with invalid transactions since the node does not disclose its real identity.


2. Block reward is the only incentive mechanism in Bitcoin.


3. The value of block reward halves every 210,000 blocks.