this post was submitted on 07 Jun 2026
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    [–] ExtremeDullard@piefed.social 338 points 3 weeks ago* (last edited 3 weeks ago) (27 children)

    I'll do one better:

    Reshaped payment card's NFC antenna

    My payment card was just a bit too wide to fit in my cellphone's cover. The phone's own NFC antenna is at the top - and I use it all the time - so the card had to be at the bottom of the cover to avoid triggering the phone all the time, in portrait orientation so-to-speak.

    So I dissolved the card in acetone to extract the NFC chip and its antenna, then carefully reshaped one end of the antenna so it's a bit less wide (and since I couldn't modify the length of the wire or the number of turns in any way to avoid de-tuning the antenna too much, I sort of accordioned one side of the rectangle to accommodate the extra length of wire).

    Then I set the new shape of the antenna permanently by carefully applying a piece of packing tape over it, flipped it over, taped over the other side to seal everything, then carefully cut around the new, ultra-thin, stubbier contactless payment "card".

    Now it fits really smartly in my cellphone cover!

    [–] SpaceNoodle@lemmy.world 173 points 3 weeks ago (1 children)

    Next time someone calls me a maniac, I'll show them this.

    [–] WhoIzDisIz@lemmy.today 19 points 3 weeks ago

    Definitely doesn't live up to their username.

    [–] flamingos@feddit.uk 79 points 3 weeks ago

    The fact it's secured with a piece of sellotape is just *chef's kiss*.

    [–] napkin2020@sh.itjust.works 50 points 3 weeks ago

    You are fucking crazy. I love you.

    [–] felsiq@piefed.zip 38 points 3 weeks ago

    >ExtremeDullard
    >most interesting post

    ???

    Peak Lemmy behaviour I love it

    [–] 87Six@lemmy.zip 28 points 3 weeks ago

    I just wanted to say your dad is definitely proud of you dude

    [–] gedfromgont@piefed.ca 23 points 3 weeks ago

    You just had to 1-up everyone here...

    [–] Pyron@feddit.org 22 points 3 weeks ago

    "Please use chip reader".....

    [–] OwOarchist@pawb.social 17 points 3 weeks ago (4 children)

    I dissolved the card in acetone to extract the NFC chip and its antenna,

    Wouldn't the acetone also dissolve the insulation around the antenna wire? So when it touches itself, it shorts itself out, and -- electrically speaking -- you only have one turn of thicker wire?

    [–] Darkassassin07@lemmy.ca 36 points 3 weeks ago

    Wire that thin is usually insulated with an enamel coating. I'd guess it's either unaffected by acetone, or just tougher to breakdown. Allow the card to dissolve, but remove and dry asap, don't let it linger longer than necessary.

    Veritasium demoed this a few weeks ago while discussing tap-to-pay security and a vulnerability with apple pay+visa.

    [–] Korhaka@sopuli.xyz 15 points 3 weeks ago (3 children)

    Only one way to find out, good thing that these don't cost any money and you can just ask for a new one.

    Maybe take some cash out first to cover any payments you may need to make it it breaks in some way.

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    [–] mexicancartel@lemmy.dbzer0.com 11 points 3 weeks ago* (last edited 3 weeks ago)

    Well if it dissolved any insulation, it will not work, as the coil isnt even coiling. It is not a one big coil buy just two ends shorted(or as in the picture, a very small coil. Since this works i can only conclude coating does not dissolve in acetone

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    [–] definitemaybe@lemmy.ca 12 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

    Have you ever run into difficulty with needing to authenticate with chip+PIN? Like while traveling?

    That would be my big concern with this; it would make it very difficult to pass a PIN check, to say the least!

    Super cool idea. I might just try it myself and see if I run into issues.

    [–] ExtremeDullard@piefed.social 14 points 3 weeks ago (2 children)

    What I modified was in fact a contactless payment token. It had the form factor of a payment card, but it only does NFC.

    I have another card for chip+pin.But I almost never use it where I live, because all limits were lifted on contactless payments a few years ago. If I try to pay something really expensive contactless, it will ask me for the pin - which is specific to the payment token.

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    [–] bacon_pdp@lemmy.world 10 points 3 weeks ago (2 children)

    I am surprised that no one sells cases designed for exactly this

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    [–] newton@feddit.online 10 points 3 weeks ago

    Ty, great idea will try it

    [–] GreenShimada@lemmy.world 9 points 3 weeks ago

    I love this.

    Amazing, I have never thought of that! I have always carried my card behind the phone, which is a bit too thick for my liking, but this is such a great idea, thanks for sharing!

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    [–] artwork@lemmy.world 51 points 3 weeks ago* (last edited 3 weeks ago) (2 children)
    [–] flamingos@feddit.uk 32 points 3 weeks ago (1 children)
    [–] normis@infosec.pub 46 points 3 weeks ago (4 children)

    Screen side with call buttons

    [–] Darkassassin07@lemmy.ca 10 points 3 weeks ago (1 children)

    You could put the rubber bands in between the phone and the case, so it's not on top of the screen.

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    [–] flamingos@feddit.uk 10 points 3 weeks ago

    Ah, now I see it. Thanks!

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    [–] Hazel@piefed.blahaj.zone 6 points 3 weeks ago (7 children)

    Yeah just use glue, smh my head.

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    [–] stoy@lemmy.zip 44 points 3 weeks ago (3 children)

    Or you can just keep your card in your wallet, like you have done for decades

    [–] Phantaloons@piefed.zip 22 points 3 weeks ago

    The privileged have to invent their own problems.

    [–] JesusTheCarpenter@feddit.uk 15 points 3 weeks ago

    The problem is that I don't cary my wallet with me for pretty much a decade now.

    [–] makeshift0546@lemmy.today 6 points 3 weeks ago* (last edited 3 weeks ago) (5 children)

    Didn't have to carry a phone for decades.

    Now I don't have to carry a wallet and multiple cars πŸ€·β€β™‚οΈ

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    [–] NoSpotOfGround@lemmy.world 41 points 3 weeks ago* (last edited 3 weeks ago)

    Take that Android! This works even with the phone powered off! It works even without the phone at all!

    Wait...

    [–] diaphragmwp@discuss.tchncs.de 27 points 3 weeks ago (12 children)

    Ironic it's a monobank card, it's mobile only and you have to use a locked unrooted googled phone (or an iPhone) because big brother said so.

    [–] UkrainianBull@reddthat.com 21 points 3 weeks ago* (last edited 3 weeks ago) (2 children)

    Also this https://telegraf.ua/ukr/ukrayina/5935111-gorokhovskogo-chekae-pokarannya-yuristi-rozpovili-chim-dlya-monobank-zakinchitsya-skandal-z-oprilyudnennyam-foto-klientki

    TLDR: some woman did a facial recognition log in method, the bank said that the photos are not stored and deleted instantly, but because there was a Slovenian flag (looked like russian in the photo)in the background, she got her bank account blocked and the CEO posted the verification image online

    Edit: wrong link

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    [–] Zamboni_Driver@lemmy.ca 23 points 3 weeks ago (2 children)

    Now how about contactless payments without visa or MasterCard.

    [–] brucethemoose@lemmy.world 21 points 3 weeks ago* (last edited 3 weeks ago) (5 children)

    It would have been nice if crypto didn’t turn into a network of pyramid schemes.

    Like, I am sympathetic to the idea. I mined a Bitcoin a long time ago (and lost it in intervening years). But holy moly, did it erupt into a tire fire.

    [–] jonion@lemmy.world 7 points 3 weeks ago

    GNU+Linux is currently being used to kill civilians in several wars, but we don't feel the need to point that out every time somebody mentions it online.

    Good tech can be used by bad people without everybody having to distance themselves from the tech itself.

    That's not to say that BTC is good tech, but it's a decent proof of concept to free digital transactions from monopolists and tyrants.

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    [–] PerogiBoi@lemmy.ca 13 points 3 weeks ago (4 children)

    Non American credit cards when

    [–] Obi@sopuli.xyz 6 points 3 weeks ago (1 children)

    I'm European, I technically have a MC credit card which I'll use on the rare occasions I need a credit card, but the vast majority of the time it's debit card or direct transfers (what they're now calling wero).

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    [–] drmoose@lemmy.world 19 points 3 weeks ago (3 children)

    We can go even further and create some sort of physical tokens that we can give to each other. These token would be secure, completely private, waterproof and even work offline. Maybe we could even put some pictures on them and make them vision-impaired accessible - the possibilities are endless!

    People forget that cash is a technology - a pretty good one too.

    [–] Croquette@sh.itjust.works 7 points 3 weeks ago (1 children)

    Banks are closing ATMs left and right. It is getting increasingly harder to withdraw paper money and it sucks.

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    [–] mEEGal@lemmy.world 19 points 3 weeks ago

    Nice meme, but for us out there with at least a fully virtual card (some companies provide such benefits), we need a real MyAss-Pay alternative

    I recently found Walt, but it's a work in progress for now. The app is avalaible though

    [–] nefRrgar@lemmy.world 16 points 3 weeks ago (1 children)

    Works without connection tooπŸ”₯

    [–] GutterRat42@lemmy.world 19 points 3 weeks ago

    Contactless payment works without connection. Now, the technical marvel is that it works even if the phone is dead.

    [–] UkrainianBull@reddthat.com 16 points 3 weeks ago (1 children)
    [–] user224@lemmy.sdf.org 15 points 3 weeks ago* (last edited 3 weeks ago) (2 children)

    Maybe a solution similar to this could work: https://github.com/nfcgate/nfcgate/blob/v2/doc/mode/Relay.md

    Have the card at home sitting on a reader connected to your homelab, add NFC module to PinePhone and simply relay the traffic over network.

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