make it difficult to create new accounts against attacks

with the changes in sight against spam attacks it would not be appropriate to consider the possibility of making it more difficult to open new accounts in the NANO network, i.e. the ease of obtaining an account makes a very agile attacker in the network with multiple accounts! that I thought and establish a kind of "Super POW", for new accounts, but given the changes it is the fact that the pow could be removed in later versions, I thought that a low priority could be established for the first trsation of new accounts . this solution would limit the attackers to have multiple accounts and make the network more immune to inappropriate uses. I don't know what the cons might be in such a solution

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