[#common-PSBTFillOptions-sighash_type]
= xref:common.adoc[common]::xref:common/PSBTFillOptions.adoc[PSBTFillOptions]::sighash&lowbar;type
:relfileprefix: ../../
:mrdocs:

The sighash type to use when signing (if PSBT does not specify)&period;

== Synopsis

Declared in `&lt;common&sol;types&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional&lt;int&gt; sighash&lowbar;type = &lcub;std&colon;&colon;nullopt&rcub;;
----


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