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Yorke Rhodes 50f04db1fa Make merkle proofs optional on multisig ISM (#2173) ... ### Description Validators currently sign `(root, index)` checkpoints and during verification, a `message` is passed as calldata, an `id()` is derived, and a `proof` of `id()` at `index` in `root` is verified This provides “all or nothing” censorship resistance guarantees because a validator can only sign roots to allow any contained messages to be processed. We have considered alternatives where validators sign `message` directly and we lose censorship resistance in exchange for eliminating merkle proof verification gas costs. However, if validators sign `(root, index, message)` tuples, we can skip merkle proof verification on the destination chain while still maintaining censorship resistance by providing two valid metadata formats: 1. existing validator signatures and merkle proof verification of inclusion 2. including merkle proof verification for pathway where validators are censoring `message` It’s worth noting the validator is required to index event data to produce this new signature format. However, this does not require historical indexing and new validators being spun up can simply begin indexing from tip. See https://github.com/hyperlane-xyz/hyperlane-monorepo/pull/2187 for validator changes See https://github.com/hyperlane-xyz/hyperlane-monorepo/pull/2248 for relayer and e2e test changes ### Drive-by changes Merkle index also optional ### Related issues - Fixes https://github.com/hyperlane-xyz/hyperlane-monorepo/issues/2192 ### Backward compatibility - new ISM deployment is necessary (we could upgrade implementation in theory) - Validator and relayer upgrades ### Testing Unit (fuzz) Tests, E2E tests		2 years ago
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isms	Add RoutingIsm (#1985)	2 years ago
middleware	Use interfaces in agents (#2022)	2 years ago
IGasOracle.sol	Use interfaces in agents (#2022)	2 years ago
IHyperlaneConnectionClient.sol	Use interfaces in agents (#2022)	2 years ago
IInterchainGasPaymaster.sol	Use interfaces in agents (#2022)	2 years ago
IInterchainSecurityModule.sol	Make merkle proofs optional on multisig ISM (#2173)	2 years ago
ILiquidityLayerMessageRecipient.sol	Use interfaces in agents (#2022)	2 years ago
ILiquidityLayerRouter.sol	Use interfaces in agents (#2022)	2 years ago
IMailbox.sol	Use interfaces in agents (#2022)	2 years ago
IMessageRecipient.sol	Use interfaces in agents (#2022)	2 years ago
IRouter.sol	Use interfaces in agents (#2022)	2 years ago
IValidatorAnnounce.sol	Use interfaces in agents (#2022)	2 years ago