Sharing block templates

[AntoineP]

@mcelrath

…is simply false, and an attack surface identical to those you point out, just with extra steps. There is no way to know that the template sender is a miner and not just stuffing your tx DB in exactly the same way.

I find it surprising you’d simply assume AJ didn’t think about that. Under this proposal you maintain a template per peer, so one peer cannot evict other peers’ transactions. It can at worst waste a bounded amount of your memory.