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

Test whether this is the 0 key (the result of default construction). This implies !IsFullyValid().

== Synopsis

Declared in `<pubkey.h>`

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

== Return Value

true if the key data is all zero.


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