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Compact Blocks

Placeholder Matt Corallo requested to merge github/fork/TheBlueMatt/udp into master

This is based on #8020 and implements the BIP 152 draft from https://github.com/TheBlueMatt/bips/blob/152/bip-0152.mediawiki.

In short, it sends blocks as a set of short transaction IDs to allow nodes to not double-relay transactions in blocks. There are lots of details in both the BIP and the discussion on the bitcoin-dev ML.

There are still some TODOs in the code here, but I do not think they are blockers for this, as they are not protocol-level changes and can be implemented separately to make the protocol more effecient.

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