[#BIP9Info-active_since]
= xref:BIP9Info.adoc[BIP9Info]::active&lowbar;since
:relfileprefix: ../
:mrdocs:

Height at which the deployment is active, if known&period; May be in the future&period;

== Synopsis

Declared in `&lt;versionbits&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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std::optional&lt;int&gt; active&lowbar;since;
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