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<p class="MsoNormal">I believe that EPrints stores a checksum value for each uploaded file, but as far as I understand, there is no way to monitor if the checksums match up with current file, and thus no way of checking for bit rot.&nbsp;
<br>
<br>
<o:p></o:p></p>
<p class="MsoNormal">DSpace has the following: <a href="https://wiki.duraspace.org/display/DSDOC6x/Validating&#43;CheckSums&#43;of&#43;Bitstreams">
https://wiki.duraspace.org/display/DSDOC6x/Validating&#43;CheckSums&#43;of&#43;Bitstreams</a><o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">A periodic fixity check is a part of the lowest level of support for digital preservation, i.e., &#8220;Bit-level&#8221;.&nbsp; See some examples of Digital Preservation policy, all of which have some variation on this as a requirement:&#8220;regularly audit
 checksums to ensure that no files have corrupted or changed in any way. This practice ensures the ability to provide an exact copy of original files over time&#8221;:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><a href="https://www.sfu.ca/content/dam/sfu/archives/DigitalPreservation/FormatPolicyRegistry.pdf">https://www.sfu.ca/content/dam/sfu/archives/DigitalPreservation/FormatPolicyRegistry.pdf</a> &#8220;Regularly perform fixity checks on
 AIPs&#8221;<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><a href="https://digital.library.yorku.ca/documentation/fixity-procedures">https://digital.library.yorku.ca/documentation/fixity-procedures</a> &#8220;York University Library are committed to maintaining the integrity of objects in
 its care. This includes creating checksums for all archival format objects -- plus associated datastreams -- ingested into the repository, and regular fixity checking of those objects&#8221;<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><a href="https://researchworks.lib.washington.edu/policy-preservation.html">https://researchworks.lib.washington.edu/policy-preservation.html</a> &quot;Maintains the authenticity of the bitstream through integrity checking&#8221;<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">I understand that EPrints is primarily an open access platform, but I think that we should be able to provide at least the lowest &#8220;bit-level&#8221; digital preservation support with it, and without a Fixity check, I don&#8217;t think we can ensure
 that no files are corrupted or changed over time.<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal"><a href="http://preserv.eprints.org/papers/presmeta/pm-paper-draft.html">Preservation Metadata for Institutional Repositories</a>, a report looking at EPrints and digital preservation dating back to 2007 states the following about Fixity
 checking <span style="font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">&#8220;Where is fixity check first performed? Not within EPrints currently, but a script that crawls the archive comparing files with checksums is possible&#8221;.&nbsp;
</span>We are now 10 years later, and I am wondering if and how institutions running EPrints are implementing their Fixity checks? Are you using an external tool like this:
<a href="https://www.avpreserve.com/tools/fixity/">https://www.avpreserve.com/tools/fixity/</a>? Are you using your own custom script?&nbsp; Did you develop something that is integrated with the EPrints Admin interface?<span style="font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal"><br>
Best wishes,<o:p></o:p></p>
<p class="MsoNormal">Tomasz<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal"><span lang="FR-CA" style="font-size:8.0pt;font-family:&quot;Courier New&quot;;color:#A6A6A6;mso-fareast-language:EN-CA">________________________________________________<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:17.85pt">
<span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:black">Tomasz Neugebauer<span style="background:white"><br>
</span>Digital Projects &amp; Systems Development Librarian / Bibliothécaire des Projets Numériques &amp; Développement de Systèmes<span style="background:white"><br>
</span>Library / Bibliothèque<br>
Concordia University / Université Concordia</span><i><span lang="FR-CA" style="color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:17.85pt">
<span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:black">Tel. / Tél. 514-848-2424 ext. / poste 7738<br>
Email / courriel: </span><a href="mailto:tomasz.neugebauer@concordia.ca"><span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:blue">tomasz.neugebauer@concordia.ca</span></a><span style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:black">
</span><span lang="FR-CA" style="color:black"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:17.85pt">
<span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:black">Mailing address / adresse postale:&nbsp;1455 De Maisonneuve Blvd. W.,&nbsp;LB-540-03, Montreal, Quebec H3G 1M8<br>
Street address / adresse municipale: 1400&nbsp;De Maisonneuve Blvd. W.,&nbsp;LB-540-03, Montreal, Quebec H3G 1M8<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:17.85pt">
<a href="http://library.concordia.ca/"><span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:blue">http://library.concordia.ca</span></a><span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:black;background:white"><br>
</span><a href="http://www.concordia.ca/faculty/tomasz-neugebauer.html"><span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:blue">http://www.concordia.ca/faculty/tomasz-neugebauer.html</span></a>
<span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:black;background:white">
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</span><i><span lang="FR-CA" style="color:black"><o:p></o:p></span></i></p>
<p class="MsoNormal"><span lang="FR-CA"><o:p>&nbsp;</o:p></span></p>
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