Topic: [DAILY FREE RAFFLE]460th ฿ECAUSE I AM STILL IN A GOOD MOOD FREE PHYSICAL ฿ITCOIN (Read 304 times)

What is Coldkey ?
It is a cold storage wallet card. Each Coldkey is denominated in crypto and comes with that amount loaded onto it's key.
Coldkey cards have several security features that makes them very difficult to counterfeit and tamper with.
Coldkeys cards are also collectibles. Each of them is serialized and authenticable in an unique way.


(an early working prototype)

Authenticable ?
Under that black rectangle on the picture, there is a random string of character that is unique to each Coldkey. It is the AuthKey.
There will be two AuthKeys on each card. One that is printed in plain, and one that is hidden and made with UV.
You can easily check the association of the serial number and the AuthKey on our authentication tool :

https://auth.coldkey.eu
You can try with these data:
Serial : BITCOINTALK-TEST-0
AuthKey : aZ42b321

This way you can verify if the Coldkey card you hold is authentic, and it becomes even more difficult to counterfeit a large amount of Coldkey serial numbers.

Difficult to tamper with ?
Each private key is safely covered by a security hologram sticker.
This hologram is specially made for Coldkey. (Only early prototypes have a generic "SECURE" hologram used for testing)
The Coldkey card is then covered by a plastic layer that is pretty resistant. (> 5000 Taber cycles)
Some of the attack vectors against known collectible coins are not possible with Coldkeys.
The only way to redeem the card is by cutting right through it and peel the holo. The plastic film won't be an issue at that point.
It is equally cruel and cool to have to destroy the item to redeem it tho.