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Multisig Module

Verify messages using validator signatures

The MultisigISM is one of the most commonly used ISM types. These ISMs verify that m of n Validators have attested to the validity of a particular interchain message.

Interface​

MultisigISMs must implement the IMultisigIsm interface.

// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.6.11;

import {IInterchainSecurityModule} from "../IInterchainSecurityModule.sol";

interface IMultisigIsm is IInterchainSecurityModule {
    /**
     * @notice Returns the set of validators responsible for verifying _message
     * and the number of signatures required
     * @dev Can change based on the content of _message
     * @param _message Hyperlane formatted interchain message
     * @return validators The array of validator addresses
     * @return threshold The number of validator signatures needed
     */
    function validatorsAndThreshold(
        bytes calldata _message
    ) external view returns (address[] memory validators, uint8 threshold);
}

Configure​

The hyperlane-monorepo contains MultisigISM implementations (including a legacy version and more gas-efficient versions deployable via factories) that application developers can deploy off-the-shelf, specifying their desired configuration.

Developers can configure, for each origin chain, a set of n Validators, and the number of validator signatures (m) needed to verify a message.

Validator signatures are not specific to an ISM. In other words, developers can configure their MultisigISM to use any validator that's running on Hyperlane and it will "just work".

Customize​

The hyperlane-monorepo contains an abstract MultisigISM implementation that application developers can fork.

Developers simply need to implement the validatorsAndThreshold() function.

By creating a custom implementation, application developers can tailor the security provided by a MultisigISM to the needs of their application.

For example, a custom implementation could vary the number of signatures required, based on the content of the message being verified.