bitcoincore improvement – What drawback set is the Minisketch library designed for? What’s it presently used for and what might it’s used for in future?


libminisketch is a library implementing the PinSketch set reconciliation algorithm and was coated on this Bitcoin Core PR evaluate membership. In idea it might be used for any drawback the place you’ve got two units of knowledge and wish to work out how these information units differ (which particular components are current in a single however lacking in one other) as effectively as potential.

The first use case for Minisketch on the time of writing (February 2021) is Erlay on Bitcoin.

Erlay is a proposal for extra bandwidth environment friendly transaction relay in Bitcoin and was coated on this Bitcoin Core PR evaluate membership. The Minisketch library is utilized in Erlay for set reconciliation between friends (friends usually have barely completely different units of transactions of their particular person mempools).

There’s additionally probably a Lightning use case for Minisketch which was described by Rusty Russell on this lightning-dev mailing checklist submit. Lightning nodes change gossip messages in an try to know the topology of the community (nodes and channel sizes). They use this understanding to assemble a route for a cost to a selected vacation spot. This concept has not been applied on the time of writing (February 2021). Extra centralized options akin to LN-sync are presently used to handle this drawback.

There are additionally potential use instances unrelated to Bitcoin for Minisketch too. Pieter Wuille said on IRC:

One of the crucial deployed makes use of of environment friendly set reconciliation algorithms is in the best way PGP keyservers synchronize (or at the very least used to); that is utilizing cpisync (an earlier algorithm earlier than pinsketch was invented, which has far worse efficiency)

For added potential functions of Minisketch see the Functions part of the README.

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