[#btck-KernelNotifications-BlockTipHandler]
= xref:btck.adoc[btck]::xref:btck/KernelNotifications.adoc[KernelNotifications]::BlockTipHandler
:relfileprefix: ../../
:mrdocs:

Called when the active chain tip advances&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
void
BlockTipHandler(
    xref:btck/SynchronizationState.adoc[SynchronizationState] state,
    xref:btck/BlockTreeEntry.adoc[BlockTreeEntry] entry,
    double verification&lowbar;progress);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *state*
| The current synchronization state&period;
| *entry*
| The new tip&apos;s block tree entry&period;
| *verification&lowbar;progress*
| Fraction of verification completed, from 0 to 1&period;
|===


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