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description=COLDCARD is a Bitcoin-only hardware wallet by Coinkite with air-gapped signing options, dual secure elements, and verifiable open-source firmware.;

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Text of the page (random words):
ldcard bitcoin only hardware wallet search coldcard search technology nfc push tx key teleport bbqr trick pins seed xor bip 85 secure notes passwords encrypted backups address explorer multisig coldcard co signing descriptor export microsd 2fa temporary seeds get in touch x twitter telegram support company about resellers resources security faq compare hardware wallets advanced topics mk4 security model blog newsletter more from coinkite opendime seedplate blockclock mini tapsigner wallet home mk5 q docs support downloads compare wallets learn bitcoin guides more shop coldcard home docs mk5 support q explore downloads compare wallets learn bitcoin guides more search coldcard search technology nfc push tx key teleport bbqr trick pins seed xor bip 85 secure notes passwords encrypted backups address explorer multisig coldcard co signing descriptor export microsd 2fa temporary seeds get in touch x twitter telegram support company about resellers resources security faq compare hardware wallets advanced topics mk4 security model blog newsletter more from coinkite opendime seedplate blockclock mini tapsigner wallet secure your bitcoin shop q 289 249 21 usd shop mk5 189 169 94 usd shop q shop mk5 coldcard is a bitcoin only hardware wallet by coinkite air gapped signing options verifiable firmware bitcoin only verifiable source code easy to use ultra secure buy now about coldcard coldcard is a bitcoin only hardware wallet made by coinkite since 2017 it protects private keys with dual secure elements supports air gapped signing and runs open source firmware you can verify yourself it can also generate and vault bip 39 bip 85 seeds recovery phrases passwords and private notes for other wallets unlike trezor and ledger coldcard supports only bitcoin to reduce the attack surface no companion app no cloud account trusted by bitcoiners educators and independent reviewers passed all 10 tests walletscrutiny may be the most secure way to handle key material at a distance bitcoin magazine one of the most secure bitcoin hardware wallets ever built btc sessions one of the strongest bitcoin only hardware wallets available today coin bureau the most secure bitcoin wallet you can buy bitcoin verdict best i ve used by a country mile r bitcoin start here from unopened box to a wallet you have tested do the boring checks first verify the device write the seed make the backup receive a small test amount and test recovery before you send the stack 01 first run open the bag create a seed export a watch only wallet receive a little bitcoin and sign once 02 pick q or mk5 same core security q is bigger with qr and a keyboard mk5 is smaller with microsd and nfc 03 no app lock in use sparrow cove nunchuk or specter coldcard signs the app only watches and broadcasts 04 backup first write the seed clearly add metal or encrypted microsd backup test recovery before the stack start the checklist compare wallets proof not promises three reasons coldcard is harder to fake dual secure elements two independent secure element vendors protect the seed so one chip flaw is not enough verifiable firmware coldcard firmware is open source and reproducible so advanced users can verify what runs on the device air gap workflow sign psbts using qr microsd nfc or usb without companion app lock in choose your coldcard q for qr and keyboard mk5 for pocketable microsd signing buy now learn more dual secure element 3 2 lcd screen full keyboard nfc usb c powered aaa battery powered qr code scanner done right extensive duress pin features unlimited memory no bitcoin transaction size restriction buy now learn more dual secure element bright oled screen numeric keypad nfc usb c powered small extensive duress pin features unlimited memory no bitcoin transaction size restriction sign any psbt move it your way qr microsd nfc usb and virtual disk are off by default usb c connector the industry standard for transmitting both data and power over a single cable airgap sneakernet maximum security when transferring data between devices nfc tap secure very short range wireless transmission that sends data to your phone easily virtual disk coldcard can emulate a usb disk drive so sending psbt files can be a drag n drop qr scanner coldcard q feature qr scanner done right with led illumination advanced scanning algorithms and serial interface what happens if someone forces you to unlock your coldcard trick pin features coldcard includes multiple duress countermeasures that protect your bitcoin even under physical coercion duress pin countdown to brick pin bip39 passphrases 25th word brick me pin login countdown xkcd 538 duress pin you may define an optional duress pin code if anyone enters 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 countdown to brick pin this is a covert variation of the brick me pin mode it forces a time delay of minutes hours days when logging into the coldcard but once set unlike the normal countdown this special mode covertly bricks the coldcard or optionally merely wipes the seed again this may form some part of your game theory for duress situations but is completely optional the goal of this mode is to provide plausible deniability of a required time delay similar to bank s safes while denying the attacker a functional device in case they take it away bip39 passphrases 25th word we 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 unlike the single duress pin an unlimited number of related wallets can be created using bip39 brick me pin another pin can also be defined which we call the brick me pin using that pin code at any pin prompt will destroy the dual secure element and render your coldcard worthless again this may form some part of your game theory for duress situations but is completely optional login countdown force a time delay when logging into the coldcard once enabled you must enter the pin correctly and then wait out a forced delay of minutes hours days while a countdown is shown on screen then enter your pin correctly a second time to get in xkcd 538 seeds passwords private notes coldcard is more than a hardware wallet coldcard stays bitcoin only but your security life is bigger than one wallet use it as an offline vault for less secure devices like jade trezor and ledger recovery phrases bluewallet and nunchuk seeds and recovery phrases from popular crypto phone wallets like trust wallet kraken wallet coinbase wallet metamask exodus and phantom 01 secure notes passwords store private notes and critical passwords in encrypted settings 02 bip 85 child seeds derive separate seed words for other wallets from one master backup 03 seed vault recall multiple saved secrets without keeping them on your phone keep the secrets off screenshots cloud notes and daily use computers coldcard gives them a dedicated offline home need more security our other products seedplate a better bitcoin backup metal plate single plate 12 words per side 24 total quality steel cut and etched in canada etch marks chemically colored in black for better legibility designed to be small in size only 5 3 12 7 7 62 cm for easier storage and concealment buy seedplate now coldpower 9volt battery to usb adaptor level up on your usb p p e and power your coldcard or other low power usb devices from a standard 9 volt battery without any usb data concerns makes a great gift for the cypherpunk in your life 5volts 500ma max current buy coldpower now blockclock mini our second bitcoin data display track prices from exchanges see blocks as they are published by miners and connect the opendime to display balance fiat value and deposit qr codes on a timeless 7 e ink digital display buy blockclock mini now opendime world s 1st and only real physical bitcoin opendime is a small usb that allows you to spend bitcoin like a dollar bill pass it along multiple times connect to any usb to check balance unseal anytime to spend online trust no one buy opendime now see all products security architecture built to survive real mistakes dual secure elements verifiable firmware anti phishing words air gap and dice roll entropy q mk5 why does coldcard store keys in dual secure elements we find it quite scary that some hardware wallets trust the main microprocessor with their most valuable secrets instead coldcard uses two secure elements from different vendors to protect your bitcoin specifically the coldcard uses microchip s atecc608 and maxim s ds28c36b to store the critical master secret the 24 word seed phrase for your bip39 wallet for your funds to be compromised a backdoor would need to exist for 3 different chips both the secure elements and the main microprocessor q mk5 how does coldcard detect firmware tampering to resist evil maids and other sneaky people with physical access to your coldcard we sign our firmware with a factory key during boot up the firmware s signature and nearly every byte of flash memory will be verified and the appropriate green red light set changing that light s status is actually controlled by dedicated circuitry connected directly to a 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 so any physical tampering by those maids will be visible as well q mk5 how does coldcard protect against phishing attacks the pin code on coldcard is divided into two parts such as 1234 5678 you first enter 1234 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 5678 part of your pin this protects you against a trojan horse coldcard that might look like yours but it cannot know those two words q mk5 how does coldcard prevent physical tampering the carefully designed pcb increases the se probing difficulty 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 elements 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 we ve even put a label shoot these for more effective device destruction when the time comes q mk5 how does coldcard work completely air gapped coldcard never needs to touch a computer it can work entirely from a usb power pack or ac power adapter this includes everything you need to do in the whole life of the product initial pin choosing and setup pick your 24 seed words using our trng import existing secrets or use your dice rolls export skeleton wallet files for setup of electrum or other desktop mobile wallets export lists of payment deposit address using the address explorer backup of seed and settings which saves an encrypted 7z file sign transactions for spending your bitcoin using psbt files bip174 from any standards compliant wallet firmware upgrades advanced users can even setup a multisig wallet between multiple cosigners entirely on device and air gapped using our industrial grade microsd cards or any standard microsd card for each of the above steps that require data to come in and out sneakernet for the win if you want to reach the next level paranoia you can use different cards for the data coming into versus out of the coldcard and or use cards a single time only q mk5 how can you verify your coldcard s seed generation is truly random 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 learn how to verify coldcard s dice rolls math here how does coldcard prevent tampering before delivery supply chain protection for getting an uncompromised product into your hands unique bag number we use a unique tamper evident plastic bag to package your new coldcard each bag is unique and coded with a serial number that bag number is written into the coldcard s as it s put into its bag that value cannot be changed and we ask your to verify the bag number when you power up the coldcard for the first time clear case the clear plastic case on coldcard is an important feature as well there have been demonstrations of inserting custom hardware inside a competitor s hardware wallet to capture key presses compare hardware wallets coldcard vs trezor ledger tangem fourteen practical differences that matter when choosing a bitcoin hardware wallet coldcard advantage positive trade off limitation comparison of coldcard q coldcard mk5 trezor safe 5 ledger nano x and tangem wallet feature coldcard q coldcard mk5 trezor safe 5 ledger nano x tangem wallet bitcoin only bitcoin only bitcoin only scam coins tokens scam coins tokens scam coins tokens firmware transparency open verifiable reproducible open verifiable reproducible open source security and design closed source closed firmware open source app signing workflow qr microsd nfc usb microsd nfc usb usb c with trezor suite or third party apps usb c or bluetooth with ledger wallet or third party apps nfc card or ring with compatible smartphone app qr scanning qr camera scanner no no no no microsd signing dual microsd microsd slot no no no wireless radio surface nfc no bluetooth nfc no bluetooth no bluetooth bluetooth nfc no bluetooth power aaa battery or usb c usb c usb c rechargeable battery or usb c batteryless nfc secure element model 2 vendors 2 vendors 1 safe family attack tropic01 flaw 1 closed 1 published laser fault injection attack anti phishing login check anti phishing words anti phishing words no no no coercion decoy tools duress brick countdown pin more duress brick countdown pin more passphrase only passphrase only passphrase on imported seeds only encrypted backup yes yes no no encrypted card to card copies seed tools dice rolls bip 85 seed xor seed vault dice rolls bip 85 seed xor seed vault none none seedless or bip39 through phone external coordinator workflow open psbt format no proprietary app required open psbt fo...