> I was thinking to use the IP Validation

Whose IP address, exactly, do you plan to validate?  In short any
information provided by the client is completely untrustworthy.  Just
because you think that some trusted component sets an HTTP header does
not mean it is so.  Headers are ultimately under the control of the
client and therefore not trusted.  The only suitable implementation
that comes to mind is digital signatures, which would have the burden
of key distribution and management among trusted peers.

M

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