http://walletdvl5avrmoxk2fwsf5b76zkmbkoo3r6kqeesq5hsgnq7xhbciad.onion/51-percent-attack
That is, to generate 51% or more of the units must have 51% of coins, which makes the attacker the most injured member of the network. Thus, commercial hacking is excluded completely, and destructive becomes difficult and expensive, Nevertheless, the technology is very controversial and carries other dangers, such as the possibility of monopolization of the transaction process by one major holder of funds.