[#PartiallySignedTransaction-fallback_locktime]
= xref:PartiallySignedTransaction.adoc[PartiallySignedTransaction]::fallback&lowbar;locktime
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:mrdocs:

The fallback locktime used when no input requires one (PSBTv2)&period;

== Synopsis

Declared in `&lt;psbt&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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std::optional&lt;uint32&lowbar;t&gt; fallback&lowbar;locktime;
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