> I think that any node should be default act as a shield node if so
> requested. There should be a message or a field in a message which
> indicates that the sending nodes wants to be shielded. This is a sensible
> place to put things since where the shielding indicator would goes is with
> the reference to the node in the shield node's datastore.

I don't think this is nescessary.  A node should make it apparent
(possibly in a handshake) if it is not willing to be a shield node, it
needs to give no permission beyond this. If it is willing, then all it
needs to do is to forward messages which have shadow addresses using
it's public key, to the shielded node.  

Ian.

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