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class="sidebarItemLink_mo7H" href="/cardano-updates/2023-03-16-goedel">Goedel Team Update</a></li><li class="sidebarItem__DBe"><a class="sidebarItemLink_mo7H" href="/cardano-updates/2023-03-10-hydra">Hydra Team Update</a></li></ul></nav></aside><main class="col col--7" itemscope="" itemtype="http://schema.org/Blog"><article itemprop="blogPost" itemscope="" itemtype="http://schema.org/BlogPosting"><header><h1 class="title_f1Hy" itemprop="headline">Ledger Team Update</h1><div class="container_mt6G margin-vert--md"><time datetime="2022-11-11T00:00:00.000Z" itemprop="datePublished">November 11, 2022</time> · <!-- -->3 min read</div><div class="margin-top--md margin-bottom--sm row"><div class="col col--6 authorCol_Hf19"><div class="avatar margin-bottom--sm"><a href="https://github.com/JaredCorduan" target="_blank" rel="noopener noreferrer" class="avatar__photo-link"><img class="avatar__photo" src="https://github.com/JaredCorduan.png" alt="Jared Corduan"></a><div class="avatar__intro" itemprop="author" itemscope="" itemtype="https://schema.org/Person"><div class="avatar__name"><a href="https://github.com/JaredCorduan" target="_blank" rel="noopener noreferrer" itemprop="url"><span itemprop="name">Jared Corduan</span></a></div><small class="avatar__subtitle" itemprop="description">Ledger Team Lead</small></div></div></div></div></header><div id="post-content" class="markdown" itemprop="articleBody"><h2 class="anchor anchorWithStickyNavbar_LWe7" id="high-level-summary">High level summary<a class="hash-link" href="#high-level-summary" title="Direct link to heading"></a></h2><p>I am extremely excited to say that we now have a pull request up which introduces our new versioned
CBOR serialization. This was an enormous effort, but it will solve a host of problems that we have
had since the Shelley phase. It will take time to properly review it, and we will
need to put in a lot of effort to integrate it with the downstream components, but this is a huge
milestone. Additionally, we have a new CIP proposing a deprecation cycle for the transaction
serialization schemes.</p><p>We also have a draft pull request that reworks how deposits are tracked. Users of the system will
not notice any difference, but it is a necessary change needed to prepare the way for
decentralizing the governance of Cardano.</p><p>Finally, we continued to address technical debt. In particular, we continued to make progress on
bringing coherency and consistency to the code base with a common naming convention, and
improving some error messages.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="lower-level-summary">Lower level summary<a class="hash-link" href="#lower-level-summary" title="Direct link to heading"></a></h2><ul><li>We have a pull request up for our new versioned CBOR serialization.
When we encounter a problem with our deserializers, it can be very difficult to implement a fix.
It is difficult because we can only fix such issues during a hard fork, and leading up to the
hard fork we must maintain two serializations for the same type in order to not cause unintended
network splitting (the problematic version must be used before the hard fork,
and the fixed version is used afterwards).
This can be especially tricky with the <code>FromCBOR</code> typeclass, since it is not always easy to
search for where all the problematic uses are located.
The new versioned CBOR serialization allows us to gracefully handle this transition.
See [<a href="https://github.com/input-output-hk/cardano-ledger/pull/3138" target="_blank" rel="noopener noreferrer">pull-3138</a>].</li><li>We proposed a CIP for backwards compatibility of the transaction serialization schemes.
See [<a href="https://github.com/cardano-foundation/CIPs/pull/372" target="_blank" rel="noopener noreferrer">pull-372</a>].</li><li>We have draft for the new deposit tracking.
This draft is not as memory efficient as the final version will be,
but it is a sufficient proof of concept that we can write property tests against, ensuring
that we have not changed the semantics.
We will optimize after we are sure of the correctness.
See [<a href="https://github.com/input-output-hk/cardano-ledger/pull/3127" target="_blank" rel="noopener noreferrer">pull-3127</a>].</li><li>We now provide better support for debugging failed Plutus scripts in an important helper
function, named <code>evaluateTransactionExecutionUnits</code>.
In particular, it now returns all the information needed to rerun the script with exactly the
same arguments. This feature will end up appearing in the CLI and other tools from the Plutus
tools team.
See [<a href="https://github.com/input-output-hk/cardano-ledger/pull/3135" target="_blank" rel="noopener noreferrer">pull-3135</a>].</li><li>We did a lot more renaming to bring coherency and consistency to the code base.
See [<a href="https://github.com/input-output-hk/cardano-ledger/pull/3126" target="_blank" rel="noopener noreferrer">pull-3126</a>], [<a href="https://github.com/input-output-hk/cardano-ledger/pull/3120" target="_blank" rel="noopener noreferrer">pull-3120</a>], [<a href="https://github.com/input-output-hk/cardano-ledger/pull/3118" target="_blank" rel="noopener noreferrer">pull-3118</a>], and [<a href="https://github.com/input-output-hk/cardano-ledger/pull/3116" target="_blank" rel="noopener noreferrer">pull-3116</a>].</li><li>We have added a few things to the ledger repository to make it conform to the
<a href="https://input-output-hk.github.io/cardano-engineering-handbook/" target="_blank" rel="noopener noreferrer">Cardano Engineering Handbook</a>
See [<a href="https://github.com/input-output-hk/cardano-ledger/pull/3139" target="_blank" rel="noopener noreferrer">pull-3139</a>].</li></ul></div><footer class="row docusaurus-mt-lg blogPostFooterDetailsFull_mRVl"><div class="col"><b>Tags:</b><ul class="tags_jXut padding--none margin-left--sm"><li class="tag_QGVx"><a class="tag_zVej tagRegular_sFm0" href="/cardano-updates/tags/ledger">ledger</a></li></ul></div><div class="col margin-top--sm"><a href="https://github.com/input-output-hk/cardano-updates/tree/main/blog/2022-11-11-ledger.md" target="_blank" rel="noreferrer noopener" class="theme-edit-this-page"><svg fill="currentColor" height="20" width="20" viewBox="0 0 40 40" class="iconEdit_Z9Sw" aria-hidden="true"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div></footer></article><nav class="pagination-nav docusaurus-mt-lg" aria-label="Blog post page navigation"><a class="pagination-nav__link pagination-nav__link--prev" href="/cardano-updates/2022-11-11-hydra"><div class="pagination-nav__sublabel">Newer Post</div><div class="pagination-nav__label">Hydra Team Update</div></a><a class="pagination-nav__link pagination-nav__link--next" href="/cardano-updates/2022-11-11-network"><div class="pagination-nav__sublabel">Older Post</div><div class="pagination-nav__label">Network Team Update</div></a></nav></main><div class="col col--2"><div class="tableOfContents_bqdL thin-scrollbar"><ul class="table-of-contents table-of-contents__left-border"><li><a href="#high-level-summary" class="table-of-contents__link toc-highlight">High level summary</a></li><li><a href="#lower-level-summary" class="table-of-contents__link toc-highlight">Lower level summary</a></li></ul></div></div></div></div></div><footer class="footer footer--dark"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col"><div class="footer__title">Blog</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/cardano-updates/">Home</a></li><li class="footer__item"><a class="footer__link-item" href="/cardano-updates/archive">Archive</a></li><li class="footer__item"><a class="footer__link-item" href="/cardano-updates/tags">Tags</a></li></ul></div></div><div class="footer__bottom text--center"><div class="footer__copyright">Copyright © 2023 Input Output Global, Inc. Built with Docusaurus.</div></div></div></footer></div>
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