This replace was written and supplied by Litecoin MimbleWimble lead developer David Burkett.
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Documentation
I’ve spent a while documenting all the code modifications to help our auditors. For these , that is the present listing of technical paperwork describing the MWEB modifications (a number of are solely partially full):
LIP-0002 – This describes the method for including extension blocks to LTC, together with describing how pegging-in, pegging-out, and integrating transactions work
LIP-0003 3 – That is our unique design for Mimblewimble extension blocks. It’s a bit outdated, however ought to present a excessive degree understanding of the way it works.
LIP-0004 – This describes our method to supporting one-sided txs, as an alternative of counting on interactive transactions like conventional Mimblewimble
LIP-0005 – I’m nonetheless filling in lacking knowledge buildings right here, however this paperwork the P2P protocol modifications and describes how MWEB transactions and blocks are serialized
Consensus Guidelines 1 – Not a complete listing, however describes crucial consensus guidelines
Kernels – Describes how kernels are serialized, the assorted options which might be supported (e.g. lock peak), and the way new options might be mushy forked in afterward.
Information storage – Describes the brand new database tables and knowledge recordsdata that have been added
Stealth addresses – How stealth addresses are generated, how we help subaddresses, how addresses are serialized, and so forth.
Pruned Sync 1 – Describes how pruned sync will likely be supported in future releases
Coding & Testing
I carried out my very own overview of all the node logic to search for methods to enhance safety and efficiency, which resulted in various enhancements to the code & design:
Kernel MMR is now per block, as an alternative of a perpetually rising MMR. It was decided that we don’t acquire a lot by having a cumulative kernel MMR, so switching to a per-block MMR means much less time spent hashing, and rather a lot much less disk area wanted to retailer the MMR.
Switched from sha256 to the much-faster blake3 for all MWEB hashes.
New stealth tackle format that’s extra per earlier tackle varieties, together with having higher error detection.
Extra compact serialization codecs for all MWEB knowledge buildings which can lead to much less disk area utilization, much less knowledge transferred between friends, and subsequently barely greater throughput.
Higher take a look at protection
Audits and Evaluations
I’ve formally handed off the ultimate code modifications and documentation to Quarkslab, so we must always have a extra detailed timeline from them any day now.
I’ve created a brand new code overview 5 with essentially the most vital modifications to the litecoin consensus code. It’s a lot smaller and extra centered than the libmw overview from a couple of months in the past, so hopefully we are going to get extra reviewers and sooner suggestions from different devs.
I’ve made slight modifications to the estimated timeline on wenmweb.com 23, however total, we’re nonetheless working towards MWEB activation on the finish of the yr.
