Funding Proposal: Grin MultiSig

tromp · July 19, 2025, 1:20pm

Yes, payment channels require 2-of-2 utxos, the simplest form of multi-sig. Other nodes cannot recognize these utxos, but will recognize the NRD kernels that can arise in channel closure.

syntaxjak · July 20, 2025, 8:18am

Couldn’t threshold Schnorr signing be used to expand the 2 of 2 to larger groups?

Krypticon · July 20, 2025, 12:19pm

this is the way.. now if we could pop the kernel..

Krypticon · July 20, 2025, 12:33pm

I saw on the news letter there is such a bounty for a messaging program. Why has this not been done yet?

k26dr · August 15, 2025, 12:30pm

Any reason not to just use MPC? It would allow multisig usage with no changes to the protocol.

syntaxjak · November 3, 2025, 12:31am

This is a work in progress, This is an EXTREMELY rough draft. Do not hold large amounts of grin in this HIGHLY experimental multisig-wallet as that could lead to loss of funds.

github.com/mimblewimble/grin-wallet

doc/multisig_user_guide.md

28b418339

## Grin Wallet Multisig User Guide

This guide describes the end-to-end workflow for the threshold multisig support
recently added to `grin-wallet`. It is written for a coordinator (the wallet
instance that actually holds the coins) and a set of remote holders who provide
policy approvals plus FROST signature shares.

The flow enforces two independent safeguards before any spend can be
finalized/post:

1. **Policy approvals** – every slate is tracked inside the wallet’s
   `multisig/` state directory. Finalization will refuse to proceed until the
   configured threshold of holders has approved the spend with their private
   token.
2. **FROST signing** – spending keys are split via FROST and only aggregated
   when enough holders submit their (nonce, commitment, signature share) data.

Both gates are enforced inside the owner/foreign APIs, so a compromised UI or
CLI cannot bypass them. All sensitive holder steps can be performed entirely
offline.

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Krypticon · December 11, 2025, 12:57pm

perhaps it is best to reach out to Bitcoin dev who can tell his friends? Grin can get new publicity by launching the campaign

Topic		Replies	Views
Request for funding / Antioch / Jul-Sep 2020 Governance	32	1514	June 23, 2020
Grin multisig wallet when? Development and Technical Discussion	2	526	June 17, 2019
Simple Money	16	1051	January 16, 2025
Funding Proposal 2: Bounty for a Hardware Wallet implementation - bounty? Governance	22	731	June 25, 2023
Grin product wishlist Development and Technical Discussion	64	3260	July 19, 2025

Funding Proposal: Grin MultiSig

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