I just wrote up a guide on how to set up a Strfry relay and make it accessible over TOR. It's probably not perfect so I'd appreciate feedback if there is anything that should be added or changed.

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A look at what the mempool is, how it functions, and why a healthy and open public mempool is important for Bitcoin.

A look at different relay policy filters, and why they have always been a standard part of a node's mempool.

A look at the transaction propagation dynamics introduced when nodes on the public relay network implement different filter policy.