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Aggregation ISM

Developers can use an AggregationISM to combine security from multiple ISMs. Simply put, an AggregationISM requires that m of n ISMs verify a particular interchain message.

Developers can configure, for each origin chain, a set of n ISMs, and the number of ISMs needed to verify a message.

AggregationISMs can aggregate the security of any ISMs. For example, users can deploy a Multisig ISM with their own validator set, and deploy an AggregationISM that aggregates that ISM with the Hyperlane default ISM.

Customize​

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

Developers simply need to implement the modulesAndThreshold() function.

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

For example, a custom implementation could require that low value messages be verified by a Multisig ISM, and require that high value messages also be verified by a Wormhole ISM.