[#txindex-02-BLOCK_HEADER_SIZE]
= xref:txindex-02.adoc[txindex]::BLOCK&lowbar;HEADER&lowbar;SIZE
:relfileprefix: ../
:mrdocs:

Serialized size of a block header, the offset of the first byte after it&period;

== Synopsis

Declared in `&lt;index&sol;txindex&lowbar;key&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr uint32&lowbar;t BLOCK&lowbar;HEADER&lowbar;SIZE = &lcub;80&rcub;;
----


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