wire, main, peer, netsync: utreexo header messages #226
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kcalvinalvin
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Utreexo Header is a slice of uint64s that provide the positions of the inputs that are included in the block. With this information, the receiving node is able to figure out the hash positions it needs to verify that the given positions exist.
MsgGetUtreexoHeader is needed to communicate to others that we want a utreexo header at a given block.
This function adds code that handles sending over utreexo headers for any nodes that request them.
Utreexo header messages are requested based off of the list of headers that we've received from our peer. Once we have all the utreexo headers, we then ask for the blocks.
Since we check for the entire invvect to see if a peer has a particular tx or block, we can mistake that the peer doesn't have a tx or a block when they do if the invtype has the utreexo flag. Since having the utreexo flag doesn't change the underlying tx or the block, it's better to not distinguish between the two when tracking if the peer has a certain block/tx.
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We introduce MsgUtreexoHeader and GetMsgUtreexoHeader messages that's used to communicate the positions of the leaves in the utreexo accumulator that are being spent in a given block.