Weak security
The majority of bitcoin lost has been due to the owners' mismanagement of a single key, not external factors. A single key means a single mistake, loss or device flaw is enough to lose everything.
Bitcoin multisig wallet
The Bitcoin multisig wallet with no single point of failure
A multisig wallet needs more than one key to spend, so losing a phone, a hardware device or even a wallet company can't lose your bitcoin. Nunchuk makes multisig easy to set up, lets you mix keys from different makers, and plans for your heirs from day one. Free to start.
- 10+ hardware vendors
- Zero KYC
- Open source
The problems
Why multisig
A multi-signature Bitcoin wallet, or “multisig” for short, is the safest way to own bitcoin. Single-signature setups keep proving the point: one device, one vendor, one point of failure.
Hard to use
Traditional multisig wallets on the market are difficult to use, often accessible to only the most tech-savvy Bitcoin users.
No inheritance
The complexity of traditional multisig breeds another problem: how to pass on your bitcoin to your loved ones. The more secure a wallet, the harder it is for your family to access it after you are gone.
No single point of failure
Nunchuk was created to solve exactly these problems
The starting point of our design is a multisig wallet. A multisig wallet is both more robust (you can lose one or more keys and still access your funds) and more secure (spending requires more than one key). It is a must when storing bitcoin for the long term.
Our job is to bring down the barrier of entry to multisig, and to create an easy way for Bitcoiners to pass on their wealth.
Multi-vendor multisig
Multi-vendor multisig: keys from different makers, one wallet
A multisig wallet removes the single point of failure of one key. Multi-vendor multisig goes one step further and removes the single point of failure of one manufacturer.
One vendor is one point of failure
Every hardware wallet depends on its maker: the code that generates your seed, the firmware that signs, the supply chain that delivers it. A flaw in any of them is shared by every key from that vendor, and flaws like these have let attackers drain wallets without ever touching a device.
Different makers share no flaw
In a 2-of-3 wallet, two keys from the same maker are exposed to the same flaw, and two keys is enough to spend. With keys from different makers, a flaw in one vendor never reaches the threshold. Your bitcoin stays safe even if one manufacturer gets it wrong.
One app coordinates them all
Nunchuk is a wallet coordinator, not a hardware maker, so it has no vendor to favour. It works with 10+ hardware wallets over USB, QR codes, SD cards and NFC, and the onboarding wizard adds each key in minutes, on your phone or desktop.
Wallet types
Self-custody, assisted or collaborative multisig
Start with the keys you hold, add a Nunchuk platform key when you want help, or share a wallet with the people you trust.
Free
DIY multisig
Create single-sig and multisig wallets with your own hardware keys. Open source, air-gapped and NFC signing, coin control, decoy wallets.
Most popular
Assisted multisig
A Nunchuk platform key co-signs within the rules you set: spending limits, co-signing delays, key health checks, automated key replacement, cloud backup and emergency lockdown.
Families, groups & advisors
Collaborative multisig
The world's first multi-user multisig. Co-manage bitcoin with family or business partners, with roles, access control and encrypted group chat in the wallet.
Assisted multisig
From easy onboarding to assisted recovery, you will be in good hands
Easy onboarding
Setting up a multisig wallet has never been easier. Our onboarding wizard will guide you through every step of the way, all directly from your phone.
Cloud backup
The multisig wallet configuration is securely backed up. With our assisted recovery feature, you can regain access to your wallet on a new device with a few simple steps.
Safety in layers
Multisig already mitigates the risk of key loss, but fret not if you ever lose your key. Our assisted recovery will make recovering your key a breeze.
Inheritance planning
A wallet, no matter how secure, is incomplete without an inheritance plan. Our innovative solution makes it easy to pass on your bitcoin without compromising on security.
In-app chat support
If you ever need more help, rest assured that you'll be able to talk to one of our experts. All accessible directly within the app using our built-in messenger.
Ready to set one up?
Assisted plans start at $120 per year. Hardware sold separately.
Rethinking inheritance
A dedicated inheritance key, separate from daily use
Most Bitcoin wallets treat inheritance as an afterthought. By contrast, inheritance planning is an essential element of our design.
Nunchuk pioneers the use of a dedicated inheritance key, separated from the other keys in your wallet. This key is not intended for daily use, and can only be activated on a future date chosen by you. Your wallet remains highly secure day-to-day, while your Beneficiary has an easy mechanism to access your bitcoin in the future.
More than multisig
Nunchuk is packed with an expanding list of powerful features
Emergency lockdown
Lock down your wallet if you face an imminent threat
Or simply need to go off-the-grid for a while.
Flexible spending policies
Get granular security control by configuring how the platform key behaves
A spending limit restricts the platform key to only co-sign transactions that don't exceed the spending limit for a given period. Use one of your hardware keys when spending small amounts, and require two for large amounts.
A co-signing delay gives you time to detect errors or unauthorized access before a transaction is broadcast.
Taproot and Miniscript
Built on open standards
Taproot multisig wallets on mobile and desktop, and Miniscript-based timelocks that make autonomous inheritance possible without trusting Nunchuk.
Taproot · Miniscript
Privacy
We go out of our way to ensure that you have the utmost privacy
Private by design
Nunchuk collects no personal data beyond email addresses. Sign in using your private key, communicate via encrypted messaging, or set up an inheritance plan that does not rely on proof of identity.
Personal blockchain server
Nunchuk makes it super easy to pair your wallet with a personal full node, so that you can verify your own transactions on the blockchain.
Guard your bitcoin with Nunchuk
Get started today. Free to start on iOS, Android, macOS, Windows and Linux.
