[#CBlockHeader-IsNull]
= xref:CBlockHeader.adoc[CBlockHeader]::IsNull
:relfileprefix: ../
:mrdocs:

Returns true when the header has no proof&hyphen;of&hyphen;work target set&period;

== Synopsis

Declared in `&lt;primitives&sol;block&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
IsNull() const;
----

== Return Value

True if the difficulty target is unset&period;


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