Starknet multisig

Multi-signature functionality for StarkNet.

Latest npm package:

⚠️ WARNING! ⚠️

This repo contains unaudited code. Expect rapid iteration. Do not use in production.

Current version

The current version contains all basic multisig functionality. This version consists of two pieces:

• Cairo contract code
• Unit tests for testing all the multisig functionality

The current version supports on-chain multi-signatures. The multisig is a separate contract, which is called through your regular account contract (wallet).

Functionality

The following functionality is supported:

• Create a new multisig contract with the following parameters:
  • List of signer addresses
  • Multisig threshold
• Submit a transaction
• Confirm a transaction
• Execute a transaction
• Revoke a confirmation
• Change the list of signers and threshold

Creating a new transaction

When creating a new transaction, you should call the submit_transaction function with the following parameters:

• to: Address of the transaction target
• function_selector: Name of the target function, decoded as an integer (felt)
• calldata_len: The amount of custom parameters to pass to the target function
• calldata: The custom parameters to pass to the target function
• nonce: Transaction nonce. Has to be +1 compared to the previous submitted transaction

Only signers of the multisig can submit a transaction.

Confirming a transaction

Once a transaction has been submitted to the multisig, it needs to be confirmed by threshold amount of signers. To confirm a transaction as a signer, you should call the confirm_transaction function with the transaction nonce as parameter.

Only signers of the multisig can confirm a transaction.

Executing a transaction

Once a transaction has been confirmed by threshold amount of signers, it can be executed by anyone - the executer does not have to be a signer. The execution is done by calling the execute_transaction function with the transaction nonce as parameter.

Revoking a confirmation

If you, as a signer, have confirmed a transaction, but wish to revoke the confirmation, you can call the revoke_confirmation function with the transaction nonce as parameter.

Changing the signers and threshold

There exist three functions for changing the signers and threshold:

• set_threshold
• set_signers
• set_signers_and_threshold

Only signers can change the threshold and the amount of signers. These actions need to go through the multisig itself, so you have to go through the submit_transaction function (setting the multisig contract itself as the transaction target).

Audit

The contract code has not been audited. An audit is scheduled for September 2022.

Future development

In near future we'll get here:

• A real UI
• Possibly an option to use an account contract as multisig
• Possibly off-chain signatures

Multisig implementation options

The current implementation uses Option 1 in the following image. Option 2 is in our roadmap for near future.

Contracts

The contracts are:

• Multisig.cairo: main multisig functionality
• util.cairo: various helper functionality
• Target.cairo: a mock of the target contract for the multisig, used in testing

Used components

• Starknet Hardhat plugin
• Starknet devnet, a local Starknet instance

Usage

Recommended operating system is Ubuntu. If on Windows, use WSL2.

Installation:

yarn
python3.7 -m venv .venv
source ./.venv/bin/activate

Follow the Cairo installation instructions. After that, inside the virtual environment:

• Install Cairo devnet (local blockchain) python -m pip install starknet-devnet
• Compile the contracts: npx hardhat starknet-compile contracts
• Run the devnet: npm run local
• Open another venv tab and run the unit tests with npx hardhat test

Tested to be working at least with devnet version 0.2.10.

Acknowledgements

Thanks to Sam Barnes for creating the initial multisig code and offering it available.

Fluffy stuff

Created by Equilibrium.

If you have any question, feel free to join our Discord.