Add client ID to Query messages to allow peers to identify them?

[mikera]

It would be potentially valuable to add extra identifying information to queries to allow peers to distinguish between clients. Plausible reasons:

• charge costs for computation
• offer better QoS to subscribers

Would require some sort of Auth, probably a signature on queries.

Unidentified queries would still be possible, but Peers could give them lesser / no QoS

[mikera]

Could have an overridable method in Server e.g. shouldAllowQuery

[helins]

A similar shouldAllowTransaction is also desirable for the same reasons.

Unlike queries, transactions are signed by users. Thus, a client ID (or similar) is not strictly required but it might be more convenient in some situations.