Arbitrum/Orbit L1 => L2 Hook and ISM

[nambrot]

This ticket encapsulates a hook and ISM that allows a Hyperlane message to be transported via Arbitrum's Inbox contract on L1 with the createRetryableTicket function. See more under https://docs.arbitrum.io/for-devs/cross-chain-messsaging

You can mostly follow the OpStack L1->L2 Hook and ISM for that:

• Hook https://github.com/hyperlane-xyz/hyperlane-monorepo/blob/e90ae5a0d372ab3423fe025f01eea368a6a8c120/solidity/contracts/hooks/OPStackHook.sol#L33
• ISM https://github.com/hyperlane-xyz/hyperlane-monorepo/blob/e90ae5a0d372ab3423fe025f01eea368a6a8c120/solidity/contracts/isms/hook/OPStackIsm.sol#L33

Submission of this bounty should include a demo on a testnet or mainnet with tx hashes.

[degencodebeast]

Please can I work on this?

[exp7l]

is this available to be worked on?