Nunchuk
Nunchuk Inc.
Nunchuk is a self-custody Bitcoin wallet available on iOS, Android, macOS, Windows and Linux, built around multisig and collaborative custody. Its distinctive trait is autonomous inheritance with on-chain timelocks: recovery paths are written directly into the Bitcoin scripts, so that according to the company they keep working "even if Nunchuk ceases to exist", without depending on its servers. It supports multi-user multisig custody (several people co-signing), more than 10 hardware wallets (Ledger, Trezor, Coldcard and others) and its own Tapsigner device, an NFC cold card. It states "strictly no KYC" and minimises the data it collects. It is open-source (GitHub) and publishes instructions for signed builds. Plans are tiered, aimed at individuals, families/groups and advisors.
Data & conditions
| Fund custody | Self-custody (funds in your control) |
|---|---|
| Type | Software (hot wallet) |
| Source code | Open-source |
| Recovery | Seed phrase (BIP-39) + multisig collaborativo + percorsi di eredità con timelock on-chain |
| Bitcoin-only | Yes |
| Supported chains | Bitcoin |
| Built-in swap | No |
| Built-in staking | No |
| dApp browser | No |
| WalletConnect | No |
| Hardware wallet support | Yes |
| Segment | B2C, B2B |
| MiCA / License status | Nessuna (wallet self-custody non-custodial) |
Strengths
- Autonomous inheritance with on-chain timelocks designed to keep working even if the company disappears; multi-user collaborative multisig; on mobile and desktop; zero KYC; open-source with signed builds; own NFC Tapsigner and broad hardware support.
- Self-custody: funds stay in your wallet — the platform cannot touch them.
- No KYC: usable without identity verification.
- Open-source, verifiable code.
- Self-hostable: you can run your own instance or node.
Weaknesses
- Multisig and collaborative custody require technical understanding and careful management of signing keys; pricing details for the higher tiers are not published on the site; Bitcoin-only.
- No notable sovereignty drawback documented.
Verdict
Score 4.4/5, very strong profile. In its favour: autonomous inheritance with on-chain timelocks designed to keep working even if the company disappears; multi-user collaborative multisig; on mobile and desktop; zero KYC; open-source with signed builds; own NFC Tapsigner and broad hardware support. The trade-off to weigh: multisig and collaborative custody require technical understanding and careful management of signing keys; pricing details for the higher tiers are not published on the site; Bitcoin-only.
On the Sovereignty lens the score is 4.9/5 (outstanding): the strength is fund control (5.0/5), while censorship resistance (4.8/5) is the weak link.
Promp's editorial rating based on real fees and net annual cost. Promp reviews third-party products independently.
"Sovereignty" rating: score computed on privacy/anonymity (30%), fund control (20%), censorship resistance (20%), trustless/auditability (20%) and costs (10%). Same data, different weights.
FAQ
Does Nunchuk inheritance really work if the company shuts down?
According to Nunchuk, yes: inheritance recovery paths are encoded with timelocks directly into the on-chain Bitcoin scripts and do not depend on a company server. After prolonged inactivity, once the configured delay passes the heir can spend the funds. Being on-chain scripts, the feature is designed to remain valid even if Nunchuk ceases to operate.
Does Nunchuk require KYC or an ID?
No. The site explicitly states "strictly no KYC" and minimises the data it collects. It is a self-custody wallet: the keys stay yours.
What is Tapsigner and is it mandatory?
Tapsigner is Nunchuk's NFC cold card, used as a signing key. It is not mandatory: Nunchuk supports more than 10 third-party hardware wallets (Ledger, Trezor, Coldcard and others) and can also sign with the key on the device, but Tapsigner is a cheap option to add a hardware key to the multisig.
Sources
- Official service page Piattaforme · Bitcoin only · Multisig · Eredita timelock · +4 Data verified on Aug 3, 2026
- github.com Sovranita.open source · Signed builds Data verified on Aug 3, 2026