Tuesday, December 5, 2023

Litecoin MimbleWimble September Recap Replace

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


v0.21 Launch

I hoped to have the v0.21 launch out already, however I’m ready on one final developer to assessment. A few us have already run by way of a take a look at construct to ensure our environments are setup accurately, so as soon as everybody has signed off on the code, we should always be capable of get a launch candidate constructed and signed pretty shortly.

Essentially the most notable change in v0.21 is the inclusion of Taproot assist. The Taproot logic is similar as in bitcoin, however activation shall be performed in another way. We selected to trial the mechanism we’re planning to make use of for MWEB activation, which is bip8 6 with lockinontimeout set.

Tender fork activation could be exhausting to comply with at occasions, as a result of there’s a number of other ways it may be performed (BIP8, BIP9, UASF, and so forth.), and activation takes place by way of quite a lot of steps or “states”, that aren’t normally defined nicely for non-technical customers. I wish to make sure that everybody can comply with what’s occurring, so we’ll stroll by way of the method for activating taproot.

Taproot Activation

Every block has a model subject, which miners can use to “vote” for gentle forks. Miners shall be utilizing a small a part of the model subject to sign for Taproot activation.

Each 8,064 blocks, a brand new “window” is began. On the finish of every window, nodes tally up the entire blocks that sign for a characteristic, and if the overall meets the outlined threshold, the characteristic “locks in” for activation within the following window. In our case, the edge is outlined as 6,048 blocks or 75% of the blocks within the window.

So right here’s how this may search for Taproot:

  1. Taproot will initially be within the DEFINED state, which simply means it’s a recognized characteristic however can’t be voted on but.

  2. At block 2,153,088 (early- to mid-November), the characteristic will swap to a STARTED state, which means upgraded miners can begin signaling/voting for activation of taproot. After 8,064 blocks (the primary window), nodes will add up the variety of blocks that signaled for Taproot activation.

  3. The method repeats till one in all two circumstances is met:

    • A window happens with at the very least 6,048 (75%) of the blocks signaling for Taproot:

      • On the finish of this window, Taproot switches to the LOCKED_IN state. It stays LOCKED_IN for the subsequent full window (8,064 blocks), permitting everybody time to improve.

      • After being LOCKED_IN for one full window, Taproot switches to ACTIVE. Nodes start implementing Taproot consensus guidelines for all blocks

    • If the edge is NOT met by block 2,362,752 (Nov 2022), we depend on the lockinontimeout choice I discussed earlier:

      • Taproot switches to LOCKED_IN, regardless of not assembly the edge. Miners should begin signaling for Taproot. Any block that doesn’t sign for Taproot shall be ignored by the nodes on the community.

      • After being LOCKED_IN for one full window, Taproot switches to ACTIVE. Nodes start implementing Taproot consensus guidelines for all blocks

I hope that is straightforward sufficient to know, but when any of it’s unclear, the complete BIP8 spec is out there right here 6.


I met with the Quarkslab auditors Wednesday for a mid-audit check-in. They’re wrapping up their static evaluation of the code, and have discovered only a few points to this point, which could be very encouraging.

We additionally mentioned priorities for the rest of the audit, to ensure crucial items are totally lined.

For the subsequent few weeks, one auditor shall be specializing in manually testing, making an attempt to ensure it really works as anticipated, and extra importantly, making an attempt to see if they will break it.

The opposite auditor is educated on cryptography, so shall be focusing closely on the one-sided tx design (LIP-0004) to ensure we didn’t miss any assaults that might compromise key integrity, result in tx malleability (i.e. permitting somebody to change a transaction that they aren’t the creator of), or every other variety of safety points.

I anticipate us to have the outcomes of the audit in only a few weeks

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