[#DescriptorCache-CacheDerivedExtPubKey]
= xref:DescriptorCache.adoc[DescriptorCache]::CacheDerivedExtPubKey
:relfileprefix: ../
:mrdocs:

Cache an xpub derived at an index

== Synopsis

Declared in `<script/descriptor.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
CacheDerivedExtPubKey(
    uint32_t key_exp_pos,
    uint32_t der_index,
    xref:CExtPubKey.adoc[CExtPubKey] const& xpub);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *key_exp_pos* [in]
| Position of the key expression within the descriptor
| *der_index* [in]
| Derivation index of the xpub
| *xpub* [in]
| The CExtPubKey to cache
|===


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