This is a proposal that introduces ordering to the Farcaster protocol. (See farcasterxyz/protocol#193)
The main advantage of this proposal is that it does not require any coordination (for example no need to appoint special roles or powers to a specific serializer).
There is a mempool where every hub submits deltas. Miners propose new blocks, each block is linked to the previous one in a blockchain. Anyone can spin up a miner.
Miners have to stake (lock) an amount of ETH but this amount is not fixed and may go up automatically if many miners compete in block creation. The stake is not slashed or lost in any way, but it will remain locked for 100 days, before the miner can withdraw it.