[#btck_NotifyBlockTip]
= btck&lowbar;NotifyBlockTip
:mrdocs:

Function signatures for the kernel notifications&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef void(* btck&lowbar;NotifyBlockTip)(void*, xref:btck_SynchronizationState.adoc[btck&lowbar;SynchronizationState], xref:btck_BlockTreeEntry-0c.adoc[btck&lowbar;BlockTreeEntry] const*, double);
----

== Description

Callback invoked when the active chain tip advances or reorganizes&period;


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