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yes.. when hashing the timestamp it will be a problem.. (encrypting with RSA would be a good idea for that)
what I do is that I have set a time-offset (right now a day) that gets accepted.. just check if the timestamp is inbetween a certain time-span
when leaving the seconds away from the timestamp it should not be a problem since one page loads the dynamic pic right away when being loaded --> so no delay (or very little)
dynamic IPs are not a problem.. since the IP will always be the same when online.. it does not jump around during one online session..
dynamic proxies could be a problem --> IP does change
but I have not read up on that yet
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