@staticmethod
def get_key(block_number, activation_delay):
    """
            activation_block_number is the block number after which config will be activated
            so an activation block number 10 means the config will be activated only after adding
            block number 10 into the block chain
        """
    activation_block_number = block_number + activation_delay
    return b'proposal_record_block_number_' + activation_block_number.to_bytes(
        8, byteorder='big', signed=False)
