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MuSig2
A proof of concept
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What's MuSig2

It’s a multi-signature scheme for #Bitcoin based on Schnorr signatures.
Think of it as an upgrade to how multiple parties sign transactions — faster, lighter, and more private. 🔐

Unlike traditional multi-sig (e.g., m-of-n), MuSig2 lets multiple signers create one single aggregated signature.
On-chain, it looks like a regular signature. No one can tell it's multi-sig. 🤫

It’s non-interactive (after key setup), minimizes bandwidth, and is compatible with Taproot.
That’s a big deal for scaling, privacy, and efficiency.

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Advantages of MuSig2

MuSig2 has some serious benefits over classic multisig:

✅ Compact: One signature
✅ Private: Hides signer info
✅ Efficient: Fewer communication rounds

It works perfectly with Taproot, taking advantage of Bitcoin’s latest upgrade to enhance smart contract logic and privacy
Also: It reduces transaction fees—critical for apps, exchanges, and high-volume users.

Security + privacy + lower cost = a big win.
That’s MuSig2 in a nutshell. 🔐🚀

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Satochip — 1st smartcard wallet to support MuSig2

Satochip is breaking new ground:
It’s the first hardware smartcard wallet actively working on MuSig2 support.


Youtube link: https://youtu.be/KNhIsin0HdU

Why’s that big?

Smartcards have strict security and performance constraints. Supporting MuSig2 shows it’s not just a concept — it works even in highly secure, limited environments.
This unlocks secure multi-party signing on tamper-resistant cards — ideal for institutions, custody services, or even individuals who want maximum security.

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Let's talk integration

You are a mobile wallet dev? You build your own multi-sig application?
Let's talk and see how we can collaborate to bring you smartcards with MuSig support into your solutions.

👇

The implementation is available on our github:
* [Satochip firmware withMuSig2 support](https://github.com/Toporin/SatochipApplet/tree/musig2-support)
* [Satochip firmware diff with the new code](https://github.com/Toporin/SatochipApplet/compare/schnorr-support...musig2-support)
* [Pysatochip library & CLI with MuSig2 support](https://github.com/Toporin/pysatochip/tree/musig2-support)
* [Pysatochip library & CLI diff with the new code](https://github.com/Toporin/pysatochip/compare/satocash-support...musig2-support)


If you like it, please consider to support our proof-of-concept for the Bitcoin conf. hackathon: https://devpost.com/software/musig2-support-for-open-source-hardware-wallet-satochip
Like and Comment 

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Contact

Telegram: https://t.me/Satochip
Twitter: https://twitter.com/satochip
Website: https://satochip.io
GitHub: https://github.com/Toporin
Youtube: https://www.youtube.com/channel/UCPmmfB5PpuwMtha9mbaRNlg