[#kernel-ChainstateManagerOpts-check_block_index]
= xref:kernel.adoc[kernel]::xref:kernel/ChainstateManagerOpts.adoc[ChainstateManagerOpts]::check&lowbar;block&lowbar;index
:relfileprefix: ../../
:mrdocs:

If set, run the block index sanity check at this frequency&period;

== Synopsis

Declared in `&lt;kernel&sol;chainstatemanager&lowbar;opts&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional&lt;int32&lowbar;t&gt; check&lowbar;block&lowbar;index = &lcub;&rcub;;
----


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