It means that to revert a 1 hour-old transaction, an attacker would have to consume double the energy the whole bitcoin network expended in that hour.
More energy expended == more security.
Number of TX is totally irrelevant.
It means that to revert a 1 hour-old transaction, an attacker would have to consume double the energy the whole bitcoin network expended in that hour.
More energy expended == more security.
Number of TX is totally irrelevant.