[#PartiallySignedTransaction-ComputeTimeLock]
= xref:PartiallySignedTransaction.adoc[PartiallySignedTransaction]::ComputeTimeLock
:relfileprefix: ../
:mrdocs:

Compute the effective locktime from the inputs and fallback&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional&lt;uint32&lowbar;t&gt;
ComputeTimeLock() const;
----

== Return Value

The computed locktime, or nullopt if it cannot be determined&period;


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