Nunchuk Releases Open-Source Tools for Bitcoin Agents

Nunchuk released two open-source repositories that enable AI agents to operate Bitcoin wallets within boundaries set by human users.

The MIT-licensed Nunchuk CLI handles command-line wallet management, while the companion Agent Skills repository gives AI systems predefined commands for common workflows. Both tools target developers building automated financial systems on Bitcoin. The company proposes a shared custody model where agents operate within strict policy limits, rather than granting full control over funds with basic safeguards.

The multi-key wallet structure uses three keys: a user key, an agent key, and a policy co-signer. Policy-based limits can enforce daily spending caps, approval requirements, and signing delays. Human authority stays intact for transactions exceeding predefined thresholds. Agents can create wallets, invite participants, and construct transactions, but can't bypass the policy layer.

CLI functions include key generation, wallet creation, transaction workflows, policy configuration, wallet descriptor export, and backup support. The Agent Skills repository provides AI-ready interfaces for wallet setup, participant management, and transaction execution. Nunchuk identified four use cases: shared human-agent wallets, automated bill payment systems, treasury management tools, and multi-agent coordination.

Nunchuk launched in 2020 as an open-source, multi-signature mobile wallet focused on Bitcoin security and self-custody. The company was the first to implement Miniscript, a Bitcoin scripting language invented by core developer Pieter Wuille for smart contracts. In 2022, Canadian Freedom Convoy activists used a Nunchuk multisig wallet to secure over 20 BTC, worth more than ₱59.53 million ($1 million) at the time, after founder Hugo Nguyen said the wallet received so many individual donations that it broke the app and required an urgent update. Both repositories became available under the MIT license on April 8, 2026.