The risk of running a node is spread across all users of the network as you describe, this how networks like gnutella etc operate, which was the inspiration for Bitcoin's p2p data dissemination model.

That layer does *not* (and cannot) provide any mitigation against denial of service attacks against the mechanism that solves the double spending problem (transaction ordering).

That's the problem that proof of work (and the fees to mobilize it) solves. This isn't new information that I'm making up, it's been discussed since 2008.

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