I don't see the problem. You must already have some means of identifying the members of the network and some means of communicating with them. Include the file or a hash of the file in the request sent to the hosts, and have them reply whether their file is the same or not. If all the hosts in the network reply affirmatively, then the file is/was the same across all hosts.

In reply to Re: Distributed agreement woes by ikegami
in thread Distributed agreement woes by andrew732

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