What chain is multibit on?

Could you clarify what you mean by "What chain is multibit on?" Are you referring to the blockchain technology that MultiBit utilizes, or perhaps you're asking about the specific cryptocurrency network it supports? If the former, MultiBit is a Bitcoin wallet, meaning it operates on the Bitcoin blockchain. If you're asking about the latter, MultiBit is specifically designed for use with the Bitcoin network, which is a decentralized, peer-to-peer digital currency system. Let me know if you have any further questions or if there's anything else I can assist you with.