> As long as honest nodes control the most CPU power on the network, > they can generate the longest chain and outpace any attackers.

But they don't. Bad guys routinely control zombie farms of 100,000 machines or more. People I know who run a blacklist of spam sending zombies tell me they often see a million new zombies a day. This is the same reason that hashcash can't work on today's Internet -- the good guys have vastly less computational firepower than the bad guys. I also have my doubts about other issues, but this one is the killer. R's, John --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]