Topic: [48 HR AUCTION] Tangem Bank Cards (Fun Auction, No minimums) (Read 422 times)

The transparent one is  a special edition with unlocked features, where the white one have some limitations concerning the times that can be loaded/unloaded

I am not quite sure if they can be used without the tangem app. Your best bet is to contact tangem support and ask. Actually depends on what would you like to do with them (without the app).

Those cards are designed to act like physical bank notes (pass them around, without having to move BTC through the blockchain). The private key is stored inside the chip of the card (similar to the opendime), and you can only see the public key. You load those cards (once) with the denomination amount (i.e 0.01 BTC for the 0.01BTC card). Then you can physically handle them to someone (like real banknotes). When you tap the card to an NFC enabled device (through the app), there is an indication mentioning if the card is valid (green label) or invalid (red label) & also the amount that it is loaded with. You can load the card many times, even with more than 0.01BTC, and the status will still remain valid. If you unload even a small amount from the card, then the card status changes to invalid. The card continues to work as normal, and you can load and unload it (up to the times limit). However, the red status is an indication that the "seal" was broken, and (even once) the card was unloaded (hence to warn you to check better for the loaded amount of the card).

I believe that they use proprietary technology for chip/software. Hence in order to unload it (for security reasons), you might need to do it only through their app (in order to transfer/unload an amount from the card to an addy, you have to keep the card for 2 minutes -without interruption- attached to the device). However, in order to view the balance, just a small tap is enough. I do not know if they have open sourced the API for reading the card balance and if by using an NFC tools app, you can just read the indications. (i.e. you are a merchant and you would like to check the balance/validity of the card, but do not want to rely on their app)

That's why (as I said to the beginning) your best bet is to ask them. I contacted them long ago, and they were very helpful in answering all my questions. if you have any other questions, just shoot

(I haven't tested them yet with an NFC reading app to get indications. only through the official app)

BTW, if you get a response, I would be very interesting to know that info as well. Feel free to post here or send me a PM 

They can be interacted with with anything equipped with NFC tech, but that's as much as I can say.  Tweetious was quite well informed on the product and messaging him may be most fruitful.

Anyone know how and if these can be used WITHOUT the tangem app / support?

WINNER!

thanks for the bids all!

Thanks! Nice last minute bidding war 

All yours..cheers

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Just under 3 hours left!

Yeah! thanks, will post pictures someday when i get around them...

Sorry for taking it sideways

chronicsky with highest bid so far@ 0.01 BTC




I wonder

 Interesting! What else they give away at that cruise? 

Likely only available to the public at the discretion of the request maker [cycle] or perhaps only to attendees. Hold on to hose! Interesting to know! Thanks!

Well i don't remember the name but i do have couple tangem wallets especially made for "Cycle"
the company name was something like that only. They were being given away at Coinsbank Cruise

So i know they have done some private work with no advertising, i guess?

My research shows no others thus far, though they offer the service to anyone wanting a custom card done, minimum order quantity was not trivial IIRC

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Interesting Bitcoin HK Tangem


Does anyone know for how many companies/people has tangem made cards?

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After it was announced Tangem was producing banknotes for the Marshall Islands, https://www.coindesk.com/swiss-startup-to-produce-banknotes-for-marshall-islands-official-cryptocurrency, https://www.prnewswire.com/news-releases/tangem-to-produce-physical-blockchain-banknotes-for-the-marshall-islands-digital-currency-legal-tender-300784876.html ....

I dove down the rabbit hole and found myself acquiring all variety of Tangem Bank Cards I could locate.  Below are 5 variants (all of which are UNLOADED).

The two clear, see through are from Tangems' Early Adopters package the "Pioneer Kit" [LIMITED PRODUCTION]...collectors you know what that means. FYI these are from kit#153

The HK emblazoned smart card is also a limited engagement produced to commemorate the partnership between Tangem and the Bitcoin Association of Hong Kong and was debuted first at one of their meetings.

The Bottom two cards are the mass-produced /10,000 variety and do not show the electronics visible within as the top three varieties do - a neat feature IMO.

I did download tangems app and it seems to communicate with the cards in a useful manner (used a card not in this auction), but I did not play with loading & unloading any bits yet. Do so at your own discretion.

The last image is a picture of the stock packaging sent by tangem. I will repackage into this envelope and include it as part of the auction!









Starting Bid: 0
Bid Increments: No Minimum
Auction End time: 12 PM EST Thursday https://www.timeanddate.com/countdown/launch?iso=20190221T12&p0=43&msg=Tangem+Auction+End&font=cursive
Sniping: Any bid made within 2 minutes of auction end time extends the auction end time to +2 minutes from the time of the bid made until no further bids are made

Pay to address: 3GQq8Ggz7z7Xp7sUcqwYpdqbaRJ3mAdnVJ


Disclaimer: If forum goes down, blah blah blah auction will extend. If you are a troll bidder, I will deem you unfit to continue & banish you to the deepest darkest corner of the mantis warehouse where you will subsist solely by eating the holo scraps of peeled cas coins.



HAVE AT IT!