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Timo Pohl pushed to branch master at <a href="https://salsa.debian.org/reproducible-builds/reproducible-website">Reproducible Builds / reproducible-website</a>
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Commits:
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<strong style="font-weight: 600;"><a href="https://salsa.debian.org/reproducible-builds/reproducible-website/-/commit/bdc9aff48f01dbe71d163c504f05fd3cf05dca4f">bdc9aff4</a></strong>
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<span> by Timo Pohl </span> <i> at 2026-08-08T07:59:52+02:00 </i>
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4 changed files:
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Changes:
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<a href="https://salsa.debian.org/reproducible-builds/reproducible-website/-/commit/bdc9aff48f01dbe71d163c504f05fd3cf05dca4f#a5dacdfc2a84659a4c65132b7ce402da7ba77ee3"><strong style="font-weight: 600;">_reports/2026-07.md</strong></a>
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<td class="line_content match" style="color: rgba(5,5,6,.24); padding: inherit;" bgcolor="#fbfafd">@@ -134,6 +134,30 @@ The Reproducible Builds project detects, dissects and attempts to fix as many cu</td>
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">### Three new scholarly papers</span></span>
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown"><span class="p">[</span><span class="nv" style="color: #008080;">![</span><span class="p">](</span><span class="sx" style="color: #dd1144;">{{</span> <span class="nn" style="color: #555555;">"/images/reports/2026-07/paper-vcaligner.png#right"</span> | relative_url }})](https://ieeexplore.ieee.org/abstract/document/11593337)</span>
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<td class="new_line diff-line-num new" data-linenumber="141" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown">Yan Li, Nan Jiang, Qihang Zhou, Shaowen Xu, Yamin Xie and Xiaoqi Jia of the <span class="p">[</span><span class="nv" style="color: #008080;">Chinese Academy of Sciences</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://english.cas.cn/</span><span class="p">)</span> published a paper titled <span class="p">[</span><span class="nv" style="color: #008080;">*VCAligner: Aligning Source Distribution Versions with Upstream Git Commits to Secure Supply Chain*</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://ieeexplore.ieee.org/abstract/document/11593337</span><span class="p">)</span>:</span>
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<td class="new_line diff-line-num new" data-linenumber="143" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown"><span class="gt" style="color: #aa0000;">> We present VCAligner, a content-based alignment methodology that constructs inverted indexes over VCS histories to precisely map released artifacts to their originating commits, independent of fragile version tags. We evaluated VCAligner on a dataset of 2,984 verifiable PyPI packages derived from the 4,000 most-downloaded projects linked to public GitHub upstreams. **Our results reveal a critical weakness in conventional tag-based heuristics: while they appear effective on 85% of the dataset, the residual 15% failure rate generates a catastrophic downstream audit workload of over 10.3 million commits. In contrast, VCAligner reduces this burden by two orders of magnitude (≈ 158×), bounding the total workload to under 65,000 commits.** Furthermore, we provide the large-scale characterization of "Packaging Noise," classifying artifact divergence into structural additions (Path Phantoms) and content mutations (Blob Phantoms), thereby isolating the distinct attack surfaces of malicious injection and code tampering.</span></span>
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<td class="new_line diff-line-num new" data-linenumber="145" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="new_line diff-line-num new" data-linenumber="147" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown"><span class="p">[</span><span class="nv" style="color: #008080;">![</span><span class="p">](</span><span class="sx" style="color: #dd1144;">{{</span> <span class="nn" style="color: #555555;">"/images/reports/2026-07/paper-snakeoil.png#right"</span> | relative_url }})](https://doi.org/10.48550/ARXIV.2607.21888)</span>
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<td class="new_line diff-line-num new" data-linenumber="149" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown">Jens Dietrich and Spencer Sun from the <span class="p">[</span><span class="nv" style="color: #008080;">Victoria University of Wellington</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://www.wgtn.ac.nz/</span><span class="p">)</span> together with Tim W. White and Behnaz Hassanshahi from <span class="p">[</span><span class="nv" style="color: #008080;">Oracle Inc</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://www.oracle.com</span><span class="p">)</span> pre-published their paper <span class="p">[</span><span class="nv" style="color: #008080;">*No Snake Oil: Verifying Python Package Builds*</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://arxiv.org/pdf/2607.21888</span><span class="p">)</span> <span class="p">(</span><span class="sx" style="color: #dd1144;">PDF</span><span class="p">)</span>:</span>
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<td class="new_line diff-line-num new" data-linenumber="151" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown"><span class="gt" style="color: #aa0000;">> Python has become the default language for interacting with AI, with packages being distributed through registries like the Python Package Index (PyPI). This creates a need to analyse supply chains comprising such packages. One such analysis is to rebuild packages in order to identify compromised builds injecting malware. Independent rebuilds in hardened environments have the added advantage that they can generate and record provenance in order to increase the trustworthiness of packages. Two tools that are designed to automate such rebuilds and run them at scale are macaron and oss-rebuild. We study 12,180 popular releases from PyPI and find that the byte-for-byte equivalence rate is generally low. We analyse the reasons why they produce different wheels, and find that equivalence between the original and rebuilt wheels can often still be established, preserving most of the guarantees users expect from rebuildable releases. We present and evaluate daleq4py, a tool to establish the equivalence of Python wheels through the kernel of a normalisation function that is based on provenance-preserving datalog rules. Experimental results show that daleq4py substantially expands the set of rebuilds that can be accepted as equivalent. **Although only 15.4% of macaron rebuilds and 19.1% of oss-rebuild rebuilds are byte-for-byte identical to the published PyPI wheels, daleq4py establishes wheel equivalence for 60.2% and 78.9% of source-equivalent rebuilds, respectively.**</span></span>
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<td class="new_line diff-line-num new" data-linenumber="155" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown"><span class="p">[</span><span class="nv" style="color: #008080;">![</span><span class="p">](</span><span class="sx" style="color: #dd1144;">{{</span> <span class="nn" style="color: #555555;">"/images/reports/2026-07/paper-fdroid.png#right"</span> | relative_url }})](https://arxiv.org/abs/2607.01890)</span>
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown">Denise Nanni, Julien Malka, Stefano Zacchiroli and Théo Zimmermann from <span class="p">[</span><span class="nv" style="color: #008080;">Télécom Paris</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://www.telecom-paris.fr/en/home</span><span class="p">)</span> together with Gabriele D'Angelo from the <span class="p">[</span><span class="nv" style="color: #008080;">University of Bologna</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://www.unibo.it/en/homepage</span><span class="p">)</span> pre-published their paper <span class="p">[</span><span class="nv" style="color: #008080;">*Understanding Build Reproducibility in the F-Droid Ecosystem*</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://arxiv.org/pdf/2607.01890</span><span class="p">)</span> <span class="p">(</span><span class="sx" style="color: #dd1144;">PDF</span><span class="p">)</span>, which was accepted at the <span class="p">[</span><span class="nv" style="color: #008080;">2026 ACM Conference on Reproducibility and Replicability</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://acm-rep.github.io/2026/accepted/</span><span class="p">)</span>:</span>
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<td class="new_line diff-line-num new" data-linenumber="158" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown"></span>
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<td class="old_line diff-line-num new" data-linenumber="137" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
 
</td>
<td class="new_line diff-line-num new" data-linenumber="159" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown"><span class="gt" style="color: #aa0000;">> The security of open source applications benefits considerably from the possibility of rebuilding their source and verifying the output. F-Droid, a prominent distribution for open source Android applications, systematically rebuilds them from source and tests their bitwise reproducibility at app publishing time. However, F-Droid offers no guarantee that app reproducibility will continue to hold in the future. As software ecosystems evolve, reproducibility may degrade, with potential negative consequences for software preservation and security. We present the first empirical study of build reproducibility in the F-Droid app ecosystem. Analyzing historical reproducibility logs, we find that the overall bitwise reproducibility rate has been steadily increasing over time (as new versions of apps are published). We then evaluate how reproducibility holds in time for fixed app versions, by attempting to rebuild 18 904 app versions that F-Droid had previously confirmed bitwise reproducible, published between September 2018 and February 2026, **achieving an 83% rebuild success rate, and identify missing dependencies as the dominant cause of failure, accounting for 76% of non-rebuildable cases. Among successfully rebuilt apps, 94% are also bitwise reproducible**-i.e., they still yield bitwise identical artifacts upon rebuild. Together, these results show that while bitwise reproducibility largely holds for apps that can be rebuilt, rebuildability itself is highly sensitive to temporal decay.</span></span>
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<td class="new_line diff-line-num new" data-linenumber="160" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span class="line" data-lang="markdown"></span>
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<td class="new_line diff-line-num" data-linenumber="161" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span class="line" data-lang="markdown"><span class="gu" style="color: #800080; font-weight: 600;">### Misc news</span></span>
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138
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<td class="new_line diff-line-num" data-linenumber="162" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span class="line" data-lang="markdown"></span>
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<td class="old_line diff-line-num" data-linenumber="139" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
139
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<td class="new_line diff-line-num" data-linenumber="163" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span class="line" data-lang="markdown">On <span class="p">[</span><span class="nv" style="color: #008080;">our mailing list</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://lists.reproducible-builds.org/listinfo/rb-general/</span><span class="p">)</span> this month, Colin Winter of <span class="p">[</span><span class="nv" style="color: #008080;">Markovian Protocol</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://markovianprotocol.com/</span><span class="p">)</span> wrote to our mailing list on the topic of <span class="p">[</span><span class="nv" style="color: #008080;">*Reproducible verification for retained logs*</span><span class="p">](</span><span class="sx" style="color: #dd1144;">https://lists.reproducible-builds.org/pipermail/rb-general/2026-July/004133.html</span><span class="p">)</span>:</span>
</pre></td>
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