[#btck_NotificationInterfaceCallbacks-user_data]
= xref:btck_NotificationInterfaceCallbacks.adoc[btck&lowbar;NotificationInterfaceCallbacks]::user&lowbar;data
:relfileprefix: ../
:mrdocs:

Holds a user&hyphen;defined opaque structure that is passed to the notification callbacks&period; If user&lowbar;data&lowbar;destroy is also defined ownership of the user&lowbar;data is passed to the created context options and subsequently context&period;

== Synopsis

Declared in `&lt;kernel&sol;bitcoinkernel&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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void* user&lowbar;data;
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