Nunchuk has unveiled an open-source toolkit that lets AI agents interact with Bitcoin wallets—without handing them full control of users’ funds.
In a blog post Wednesday, the multisig mobile wallet maker said the release targets developers building AI-driven financial workflows (things like automated payments or wallet management) while preserving user custody and human oversight. The code is published under an MIT license and split into two repositories: Nunchuk CLI and Agent Skills for Nunchuk CLI.
Why it matters
Current approaches either give agents complete authority over a standalone wallet or rely on delegated signing—both of which leave little meaningful check on what an agent can do, Nunchuk founder and CEO Hugo Nguyen told Decrypt. “If it's compromised, misconfigured, or just makes a bad call, nothing stops it,” he said. Nunchuk’s tools are designed to avoid that single-point-of-failure model by enforcing “bounded authority.”
How it works
- Nunchuk CLI: a command-line interface that lets AI agents interact with shared (multisignature) wallets while users retain control of private keys. Agents can act up to predefined spending limits; any transaction above that threshold requires a human signature.
- Agent Skills: an interface layer that lets AI models call the CLI to perform common tasks—wallet setup and creation, inviting participants, configuring policies, and executing transactions.
Key design principles
- Separation of duties: depositing funds into a wallet does not automatically expand an agent’s spending authority. Funding and authorizing an agent are distinct decisions.
- Policy-driven control: spending is governed by configurable rules—limits, approval steps, or delays—so agents can operate within constrained parameters.
- Multisignature security: the system relies on shared accounts that require multiple keys to approve transactions, aligning with Nunchuk’s self-custody and inheritance planning focus.
Context
Launched in 2020, Nunchuk is an open-source mobile Bitcoin wallet that emphasizes multisig setups instead of single private keys. The new release is aimed at developers who want to give agents “real financial capabilities” without the unnecessary risk of unconstrained wallet access, Nguyen said.
Bottom line
By combining multisig architecture with policy-based limits and a clear separation between funding and authorization, Nunchuk’s tools aim to make AI-driven Bitcoin operations safer and more auditable—inviting the open-source community to build automated, but still human-supervised, financial agents.
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