The matchmaker will initially be a trusted role, run by Flashbots, but we are looking to decentralize it over time using better privacy + SUAVE’s credible commitment layer. So the matchmaker role is not designed to be permissionless. A big reason for this is the sequential auction problem: if you have multiple OFAs competing on the same orderflow, then these OFAs would compete amongst themselves for inclusion with builders, bidding up transaction fees at the expense of value for users. (We are looking to make another post on that soonish)
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