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Coinkite Coldcard
Details and User Reviews 2021

  • the seed is stored in a special chip designed to store secrets securely
  • all code is open source and can be compiled by anyone
  • hardware wallet with the option to never connect to a computer for full operation

Available at the following shops

Details Approved
  • Buy directly from the manufacturer without intermediaries

Coinkite Coldcard Description 2021

(2 votes)

The world needs an open, cheap and secure hardware wallet

What is the Coinkite Coldcard? It is a Bitcoin hardware wallet that can be used offline and signed for transactions.

  • BIP39 based, meaning you can back up the secret words on paper and have many sub-accounts and unlimited independent payment addresses. Now with BIP39 passphrase support that unlocks countless extra wallets from the same seed words!
  • It knows how to understand transactions so you can see what you’re approving.
  • The first “ParSigned Bitcoin Transaction Format”-PSBT (GDP 174) native wallet, which can be used completely offline throughout the lifecycle.

New in version 2 of the Coinkite Goldcard

  • Physical buttons! Click click click click
  • Better energy management & ESD protection
  • Tempest anti-monitoring features for keypad scanning and power savings by removing touchkeys
  • More physical protection on sensitive tracks, which improves the safety between the safe element and the main microscope.
  • Boat security improvements: Includes updates to prevent und/or detect MiTM attacks.
  • “SHOOT THIS” markers for effective device destruction
  • Activity LED for MicroSD card slot
  • Only software improvements work on older devices.

The Coinkite Goldcard is different

NO special software required. It accepts standard PSBT transactions (GDP 174) stored on a MicroSD card. NO companion application on your computer necessary, already works with the main wallets (Electrum and more in preparation).

It’s cheap! Simple packaging, simple design, no fancy boxes, no redundant cables.

It’s ultra easy! Real crypto security chip. Your private key is stored in a special security chip, not in the flash of the main microkro.

Easy backup! MicroSD card slot for backup and data storage. This allows for real offline signing by transferring the unsigned transactions via the sneaker net.

Open source software design runs on micropython and you can change it.

Other features

  • The full-fledged numerical keyboard allows easy and quick input of the PIN.
  • Larger 128×64 OLED screen.
  • Sign text messages to prove control of the private key.
  • Join other signatories in multisig wallets.
  • Encrypn/decrypt secret messages (stored on MicroSD or otherwise).

 



FAQ 7

Ask your own question

That is not a problem. You can restore your accounts to a new hardware wallet using the recovery key you wrote down when you set it up.

Most wallets support more than just one cryptocurrency, but only generate one backup. Nevertheless, this one backup is sufficient to restore all cryptocurrencies as all private keys of the different wallets result from the seed that is backed up as a backup during setup.

Hardware Wallets such as the Ledger Nano X, TREZOR Model T, BitBox02 or KeepKey all work according to the same principle. They are a special form of a so-called wallet, which is used to manage cryptocurrencies. A hardware wallet is a physical device that securely and inisolationly generates the private keys to the cryptocurrencies. Due to the extra hardware, they have some advantages over software wallets:

  • Private keys are often stored in a protected area of a microcontroller and cannot be transferred out of the device in clear text.
  • Hardware wallets are immune to computer viruses that steal from software wallets.
  • They can be used securely and interactively, private keys never need to come into contact with potentially vulnerable software.
  • The software is in most cases open source, so that the user or professionals can validate the entire operation of the device.

However, it is important to understand that hardware wallets are an attractive target for attackers and depend on several assumptions to maintain security. They are not a miracle weapon, and there are several realistic ways to hack a hardware wallet Especially if someone has physical access to the device.

A new cryptocurrency is rarely supported directly by a hardware wallet at the beginning. However, most providers such as Ledger or TREZOR are constantly working to support new cryptocurrencies. Therefore, it is often worth waiting until the desired currency is supported by your hardware wallet.

No, you don’t need the hardware wallet every time you want to make a deposit. It is only necessary to set up the hardware wallet and generate an address of the corresponding cryptocurrency.

Cryptocurrency can now be sent to this address on the desired cycle on a regular basis without the need for the hardware wallet. The address does not expire.

Are my cryptocurrencies stored in the hardware wallet, or where exactly are they? This is a very good question because the answer defines what your wallet actually needs to protect.

Cryptocurrencies are so named because they are secured by cryptography. For this you need a set of digital keys, for example your (very secret) private key. With this key you can encrypt and digitally sign things.

Let’s take Bitcoin as an example (other cryptocurrencies work in a similar way). The entire Bitcoin network is kept up to date by a common data structure called the blockchain. It contains records of all transactions ever made and is publicly accessible online, so anyone can read it. When you receive some bitcoins, say 0.1 BTC, you see them in your bitcoin wallet, listed under a bitcoin address.

At the same time, the bitcoins are not actually stored in the wallet, they are just an entry in the public blockchain. What the wallet stores is your secret private key that belongs to that address. Since you control that private key, you can spend those Bitcoins again: that’s how “Bitcoin ownership” is defined. Anyone can see these bitcoins, but only you can spend it, so they are yours. But that also means that *anyone* with the right private key can spend those bitcoins. Therefore, it is very important to keep this key secret.

What stops the manufacturer of your hardware from using a backdoor and simply stealing your cryptocurrencies? How much do you have to trust hardware wallet manufacturers?

While a completely “trustless” solution is probably not possible, manufacturers are doing everything they can to minimize the need to trust them.

Most of the software code of many hardware waller manufacturers is open source, i.e. publicly available. Anyone can check how the device works and how secrets are handled. Of course, not everyone has the ability to review code: that’s why independent researchers are often encouraged to analyze, and are often rewarded by bug bounty programs when they find something. This does not limit their ability to publish a full independent report without permission.

The essentials to go: A wallet manages your secret private keys and requires full access to them. You can and should demand full transparency about how a wallet works and ensure that independent public audits are encouraged.

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For the newsletter, the mail service provider Mailerlite is used. Information on the performance measurement included in the consent, logging of the registration and your revocation rights can be found in the privacy policy.


Product Specifications

CompatibilityElectrum
CryptocurrenciesBitcoin
PlatformWindows, Linux, Mac
BrandCoinkite
Altcoin Support
FIDO U2F Authenticator
Supported Coins1
Open Source
InterfacesUSB, microSD
Screen 2FA

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notes
You are welcome to leave pseudonyms or empty fields. Only the given data will be saved (comment, name, e-mail, website, no IP address). Further information on the processing of data and rights of objection are listed in the privacy statement.
notes
For the newsletter, the mail service provider Mailerlite is used. Information on the performance measurement included in the consent, logging of the registration and your revocation rights can be found in the privacy policy.




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