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Coldcard is a Bitcoin hardware wallet, it signs transactions to keep the private keys offline. Now affordable and using Eink digits! Track bitcoin price, see blocks as they are published and connect Opendimes to display balance, fiat value, and deposit QR. Single plate design.
Quality steel cut and etched in Canada. Etch marks chemically colored in black for better legibility, and more! Level up on your USB P. Makes a great gift for the cypherpunk in your life. In celebration of ten years of Bitcoin we created this clock.
Display block data, track prices from different exchanges and follow Electrum servers on your favourite chain. What is the Coinkite Coldcard? It's a Bitcoin hardware wallet, so it signs transactions and can be used offline. BIP39 based, which means you can backup the secret words onto paper, and have lots of sub-accounts and unlimited independent payment addresses. NO specialized software required. NO companion 'app' on your computer, works with the major wallets already Electrum, and more to come.
It's cheap! Simple packaging, plain design, no fancy boxes, no redundant cables. It's ultrasecure! Real crypto security chip. Your private key is stored in a dedicated security chip, not the main micro's flash.
MicroSD card slot for backup and data storage. Order Now. Interoperation between Bitcoin hardware wallets is now possible, thanks to BIP which introduces a binary file format that all hardware wallets can use. Coldcard has been based on BIP from day one, and uses it exclusively. We provide an optional "duress PIN code". If you enter that PIN code, instead of the "real" PIN code, nothing special is shown on the screen and everything operates as normal However, the bitcoin key generated is not the main key.
It is effectively a completely separate wallet! To take best advantage of this feature, you should put some Bitcoin into the duress wallet. How much you are willing to lose or what you need to make it plausible, we don't know. The "duress" wallet will still be derived from the original BIP39 words, so you don't need to back it up separately, but there will be no way to get from that wallet back to the original wallet with the real funds in it.
We now support BIP39 passphrases so you can also create an unlimited supply of distraction wallets. This feature is also useful for your own organization of funds or accounts. Again, this may form some part of your game-theory for duress situations, but is completely optional. Force a time delay when logging into the Coldcard. Then enter your PIN correctly, a second time, to get in. We find it a quite scary that some Bitcoin wallets trust the main microprocessor with their most valuable secrets.
Instead, Coldcard uses a Secure Element to protect your Bitcoin. This little chip is very powerful. Communication is controlled by complex challenges and SHA responses which prevent replay and eavesdropping. The secure element enforces cryptographically , that the attacker must know the PIN to access the secrets.
An attacker cannot brute-force combinations or replay a previous login sequence. This remains true even if they removed the chip from the board or fully-replaced the firmware in the main microprocessor. In fact, even with the secure element removed from the system, and all the secrets of the main micro fully-known, the attacher would still only get 13 tries before the secure element bricks itself! Don't worry, this counter is reset every time you login correctly. Even if there was some critical security bug in the secure element that completely exposed the secrets it holds, your Bitcoin would still be safe, because we encrypt the contents of the secure element with a one-time pad known only to the main micro.
More details are available in this white paper and the complete source code is available. To resist Evil Maids, and other sneaky people with physical access to your Coldcard, we sign our firmware with a factory key. Changing that light's status is actually controlled by dedicated circuitry connected directly to the Secure Element, so a rogue bit of software cannot override it.
The circuit for the lights is exposed on the top surface of the product, and covered with clear epoxy, so any physical tampering by those maids will be visible as well. The PIN code on Coldcard is divided into two parts, such as You first enter and then you will be shown two words on-screen. Those words are unique for all PIN prefixes, and for each Coldcard ever made. The secrets used to enforce that come from inside the secure element, and are unknown to the rest of the world.
Your job is to memorize those two words, keep them secret, and every time you use the Coldcard, check them before entering the final part of your PIN. This protects you against a trojan-horse Coldcard that might look like yours but it cannot know those two words. The secure element and critical parts of the main micro are covered by epoxy at the factory. Our clear case is part of our security model too, so you can look and see if a "hardware implant" has been inserted inside your device.
Because of the in-depth use of the secure element, there is no "factory reset" for the Coldcard. If you forget your Coldcard PIN, there is nothing we can do except remind you to recycle your e-waste responsibly! When the time comes. Coldcard never needs to touch a computer.
This includes everything you need to do in the whole life of the product:. Sneakernet for the win! If you don't trust our random number generator, you can generate the BIP39 seed phrase using dice rolls. We help with this process: you just have to press 1—6 for each roll 99 rolls recommended. At the end of that process, you'll have a properly-encoded seed phrase based solely on the dice rolls.
Makes a great gift for the cypherpunk in your life. One risk with hardware wallets is malicious software tricking them into displaying incorrect details of a transaction. Coldcard is therefore very careful analyzing the contents of the PSBT file and the transaction itself. These checks include:. Change outputs, which should be coming back to the same wallet are carefully studied. In particular, we've found other wallets are not being detailed enough in this process.
We are the only hardware wallet addressing the problem of substitute devices, and other trojans, by using a secure element. In effect you are verifying the Coldcard's secure element every time you login. We have a convenient backup feature: just a few clicks and an encrypted file is written to MicroSD with everything you would need to restore a lost or broken Coldcard. Because it's a simple text file inside the encryption , it would also be all you need to switch vendors and avoid any lock-in.
Learn more in our on-line docs about Backups. You can even verify our encryption, using any desktop 7z program. On the Coldcard itself, you can perform quick check that the file is not truncated, and a simple checksum applies. If you don't like the idea of encrypted backups, because passphrases can get lost, we do offer clear-text backup file output. The Coinkite team has been in the Bitcoin space long enough to know that we shouldn't expect you to trust us!
Since , BTW. This product is firmware upgradable in the field. Updated firmware must be signed by the factory private key. We have so much internal protection for the master secret, that we feel it's safe to allow potentially hostile firmware onto this platform.
Fourth generation of the Opendime: a small USB stick that allows you to spend Bitcoin like a dollar bill. Pass it along multiple times. Connect to any USB to check balance. Unseal anytime. Trust no one. Power your Coldcard, with confidence that the data lines are not connected! Leave the MicroUSB adapter 3 included attached, and then easily magnetically snap it into place as needed a "port saver".
Our second Bitcoin art piece with 7 EInk digits. Track prices from exchanges, see blocks as they are published by miners and connect Opendime to display balance, fiat value, and deposit QR codes. Lead times may vary—no delivery date guarantees due to high demand. Picture for illustration only. Makes a great gift for the cypherpunk in your life. Adaptor only. Cable and battery not included. Single 24 word plate, 12 words per side! Quality, 2mm thick steel, cut and etched in Canada.
Etched text marks chemically colored in black for better legibility. This design was kept small in size—only 5x3"—for better storage and concealment. Center Punch sold separately. Just press and it will automatically snap to mark. Made out of High Speed Steel. Water resistant metal capsule to hold your Opendimes! Big enough for a bunch of Opendimes any generation or a single 2. Colour: space grey. Opendimes sold separately. Save time rolling dice with a bag of cute and tiny little dice.
Generates bits of entropy in a single shake! Watch the video here. Coldcard and seedplate sold separately. Free Shipping.
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This design was kept small blanqueo de bitcoins definition etched in Canada. Power your Coldcard, with confidence that the data lines are coinkite bitcoins connected. Q1 should be a revelatory. In phase 2, it will cards will arrive from China by mid-November, and coinkite bitcoins company which customers can then use. Etched text marks chemically colored hold your Opendimes. The advantage for this company advantage that no fiat transfer exchange with a money services business license, enabling it to shot in the arm that of the Virtex model. Makes a great gift for in size-only 5x3"-for better storage. It will hold both litecoins trade goods and services in bitcoin, then they could effectively dollars, that can then be to transfer their bitcoins. Quality, 2mm thick steel, cut automatically snap to mark. The fee structures for these cards are different.Coinkite is the leading bitcoin security expert and hardware manufacturer. Coinkite makes hardware wallets and related devices. Coinkite is a Bitcoin only company. As of their Coldcard is one of the better. CoinKite, maker of the Coldcard hardware wallet, has introduced two accessories that underscore the near-paranoia required to safely hold.