Attacking networks the size of Bitcoin or Ethereum is certainly much more difficult than what it costs due to the amount of participants, but not all networks are that lucky. In theory, you’d only need USD 47 to launch an hour-long attack on Bitcoin Private by renting out enough hashing power from NiceHash, a Slovenian cryptocurrency cloud mining marketplace, according to crypto51.app, a website that tracks costs of a 51% attack.free cardano