This replace was written and offered by Litecoin MimbleWimble lead developer David Burkett.

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Documentation

I’ve spent a while documenting the entire code adjustments to help our auditors. For these , that is the present checklist of technical paperwork describing the MWEB adjustments (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 It’s a bit outdated, however ought to present a excessive stage understanding of the way it works.

LIP-0004 – This describes our strategy to supporting one-sided txs, as a substitute of counting on interactive transactions like conventional Mimblewimble

LIP-0005 – I’m nonetheless filling in lacking information constructions right here, however this paperwork the P2P protocol adjustments and describes how MWEB transactions and blocks are serialized

Consensus Guidelines 1 – Not a complete checklist, 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 comfortable forked in afterward.

Information storage – Describes the brand new database tables and information recordsdata that have been added

Stealth addresses – How stealth addresses are generated, how we assist subaddresses, how addresses are serialized, and many others.

Pruned Sync 1 – Describes how pruned sync might be supported in future releases

Coding & Testing

I carried out my very own overview of the entire node logic to search for methods to enhance safety and efficiency, which resulted in quite a lot of enhancements to the code & design:

Kernel MMR is now per block, as a substitute of a perpetually rising MMR. It was decided that we don’t achieve 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 house wanted to retailer the MMR.

Switched from sha256 to the much-faster blake3 for all MWEB hashes.

New stealth tackle format that’s extra according to earlier tackle varieties, together with having higher error detection.

Extra compact serialization codecs for all MWEB information constructions which is able to lead to much less disk house utilization, much less information transferred between friends, and due to this fact barely larger throughput.

Higher take a look at protection

Audits and Critiques

I’ve formally handed off the ultimate code adjustments 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 important adjustments to the litecoin consensus code. It’s a lot smaller and extra centered than the libmw overview from just a few months in the past, so hopefully we are going to get extra reviewers and sooner suggestions from different devs.

I’ve made slight adjustments to the estimated timeline on wenmweb.com 23, however total, we’re nonetheless working towards MWEB activation on the finish of the 12 months.