A hardware wallet is a device that stores a part of a user's wallet securely in mostly-offline hardware. They have major advantages over other wallet types:
- the key is often stored in a protected area of a microcontroller, and cannot be transferred out of the device in plaintext
- immune to computer viruses that steal from software wallets
- can be used securely and interactively, as opposed to a paper wallet which must be imported to software at some point
- much of the time, the software is open source, allowing a user to validate the entire operation of the device
This page is an attempt to summarize all the known developments of hardware wallets that can use Bitcoin as part of their operation.
- 1 Purchasable hardware wallets (ordered chronologically)
- 2 Not purchasable hardware wallets
- 3 Smart Card based wallets
- 4 Related Resources
Purchasable hardware wallets (ordered chronologically)
Pi Wallet - cold storage
The Pi-Wallet is comparable to an offline Notebook.
However it combines all features of the Armory bitcoin client (e.g. offline transaction signing) with the advantages of a tiny computer.
To sign offline-transaction you will need an (unused) USB stick.
TREZOR The Bitcoin Safe
TREZOR is a secure bitcoin storage and a transaction signing tool. The private keys are generated by the device and never leave it thus they cannot be accessed by a malware.
It uses a deterministic wallet structure which means it can hold an unlimited number of keys (BIP32/BIP44). A recovery seed is generated when the device is initialized. In case TREZOR gets lost or stolen, all its contents can be recovered using this seed (private keys, bitcoin balance and transaction history) into a new device or another BIP39/BIP44 compatible wallet.
TREZOR also introduced a unique way of PIN entering preventing keyloggers from recording it even when entered on a compromised computer. An encryption passphrase can be set on top of the PIN protection. More passphrases can be used for plausible deniability.
BTChip HW.1 - USB Smartcard Hardware Wallet
HW.1 is an implementation of a deterministic (BIP 32) Hardware Wallet on a USB smartcard.
It is typically used as a blind secure device for multi signature transactions - holding a set of derived private keys and signing transactions without requiring user confirmation.
Power users can rely on it to confirm all transactions with a second factor scheme turning the dongle into a keyboard typing what the user is supposed to have signed, as a protection against malware.
It is also possible to customize HW.1 for more specfic needs, such as creating a prepaid card without revealing the deterministic seed before it is received by the user, or securing bitcoin transactions on a server.
Ledger Nano - USB Smartcard Hardware Wallet
Ledger Nano protects your Bitcoin data within a smartcard. Its micro-processor certified against all types of attacks (both physical and logical), and has been used in the banking industry for decades (think credit card chips). The device connects to your computer through the USB port and will do all the Bitcoin cryptographic heavy lifting such as signing transactions inside its secure environment. You can therefore use your Bitcoin account with maximum trust, even on an insecure or compromised computer.
The second factor verification of the transaction signature can be done either with a paired smartphone (Android, iOS) or a physical security card.
The Ledger Wallet Chrome application (available also on Chromium) provides an easy onboarding as well as a seamless user experience, and the Nano is compatible with numerous third party software: Electrum, Mycelium, GreenAddress, Greenbits, Coinkite and Copay.
Ledger Unplugged - NFC Smartcard Hardware Wallet
The Ledger Unplugged is a credit card sized NFC hardware wallet. It embeds an open source Java Card app and is compatible with all NFC enabled Android phones.
The device can be used with Mycelium or Greenbits. In case of loss, you can restore it on any Ledger Wallet (Nano or another one) or all other compatible solutions (BIP 39).
BWALLET TREZOR clone
BWALLET is a clone of Trezor by a Chinese company. Trezor code is open source and this device operates like a Trezor. However, this product has been reviewed by Merek aka Slush(Trezor developer) and he has found some problems which makes this device less than 100% compatible, for example it doesn't work with myTREZOR.com website and it does not work with Trezor official firmware.
KeepKey: Your Private Bitcoin Vault
KeepKey is a USB device that stores and secures your bitcoins. When you entrust KeepKey with your money, each and every bitcoin transaction you make must be reviewed and approved via it's OLED display and confirmation button.
KeepKey has a unique recovery feature utilizing a rotating cipher to restore private keys with a BIP39 recovery seed. This means it is not necessary to store your private keys on KeepKey: the recovery process is secure enough so that KeepKey can be used as a transaction device for paper wallets.
Not purchasable hardware wallets
BitcoinCard Megion Technologies-Card based wallet
Incorporates a e-paper display, keypad, and radio (custom ISM band protocol.) Unfortunately it is fairly limited in terms of transaction I/O, requiring a radio gateway or another bitcoincard wherever funds need to be transferred.
BitSafe - allten/someone42's hardware wallet
Signing transactions only, requires USB host software for transactions & USB power. Has a OLED display and Confirm/Cancel buttons. Evolved out of someone42's prototype below, and has significant contributions from someone42 as well.
someone42's original prototype
Signing transactions only, requires USB host software for transactions & USB power. All work is rolled into the above BitSafe wallet currently.
Other/Defunct but with good discussion:
- natman3400's BitClip Jun 2011 https://bitcointalk.org/index.php?topic=24852.0
- Seems to have gone defunct around Dec 2011. Some good ideas though and seemed to have started on execution.
- jim618 hardware wallet proposal Apr 2012 Dedicated bitcoin devices - dealing with untrusted networks
- Great discussion and good ideas from jim618. Also linked the following video:
- Prof. Clemens Cap's hardware wallet? (video:)Clemens Cap about electronic bitcoin wallet at EuroBit
- Clemens Cap of Uni Rostock explains the Electronic Bitcoin wallet device he's working on. It's based on adafruit microtouch device.
- ripper234's discussion based on Yubikeys Aug 2012 Having a YUBIKEY as one of the parties for m-of-n signatures
- The use of Yubikeys. They only support symmetric crypto, so you'd have to trust the host device.
- kalleguld's hardware wallet proposal Oct 2012 Proposal: Hardware wallet (Win 3 BTC)
- Vaporware: Matthew N Wright's ellet ANN The world's first handheld Bitcoin device, the Ellet! (Vaporware)
Smart Card based wallets
This type of device requires complete trust in the host device, as there is no method for user input. See Smart card wallet
- Best Bitcoin Hardware Wallet 2015 - reviews of all bitcoin hardware wallets.
- TREZOR vs. Ledger - User reviews and Reddit feedback
- slush's Hardware wallet wire protocol discussion: Hardware wallet wire protocol
- kjj's Todo List discussion for client protocol requirements: in topic Re: Split private keys
- paybitcoin's original post: Hardware Wallet Roundup
- This thread about editing this very wiki entry.
- Various Hardware Wallets and Reviews: Offline Hardware Wallets
- Ledger Wallet Review