Well, now that WDP's patent apparently got invalidated, it's fairly trivial to see if chips are counterfeit or not. You just give each chip a unique private encryption key and give them a secret model number along with a secret password (both the same for all chips of that model). Only the manufacturer knows what those are, and they put it in non-readable memory on the card. You have "chip validators" which then also have their own private keys (unique to each reader; could even have a set of them) who get the public key from the chip, encode the password and their own key using the chips key, send the password and the reader's public key to the chip, and then the chip uses the sent public key to send the model number back.
Real chips won't send back a model number unless the reader is legit, and only legit readers will have the code to get the chip to send back it's secret model number.