[#txindex-02-DB_BLOCK_SEQ]
= xref:txindex-02.adoc[txindex]::DB&lowbar;BLOCK&lowbar;SEQ
:relfileprefix: ../
:mrdocs:

Key prefix mapping a block sequence number to its block hash&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr uint8&lowbar;t DB&lowbar;BLOCK&lowbar;SEQ = &lcub;&apos;s&apos;&rcub;;
----


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