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They vote with their CPU proof-of-worker, expressing their acceptance of valid blocks by working on extending them and rejecting invalid blocks by refusing to work on them. Any needed rules and incentives can be enforced with this consensus mechanism."
- S. Nakamoto
The question to me is: What exactly is an 'invalid block'. The final protocol could be very flexible here. Major rules should be: 21 Mio fix, no double spending,... ??