this post was submitted on 28 Jan 2025
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OK, so I followed up on this idea and I'm not sure how viable it is. The chip is very small, but the antenna is quite often traced quite far across the card. The layout depends on the card, but might be more of a pain than it's worth.
https://robinminto.com/post/2014/03/21/Disabling-contactless-payment-cards-or-preventing-card-clash-with-Oyster
Dang. I guess I'll keep my current method for now. Thanks for the update!