[#CExtPubKey-Derive]
= xref:CExtPubKey.adoc[CExtPubKey]::Derive
:relfileprefix: ../
:mrdocs:

Derive a BIP32 child extended public key.

== Synopsis

Declared in `<pubkey.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
bool
Derive(
    xref:CExtPubKey.adoc[CExtPubKey]& out,
    unsigned int nChild,
    xref:uint256.adoc[uint256]* bip32_tweak_out = nullptr) const;
----

== Return Value

true if derivation succeeded.

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *out*
| Output child extended public key.
| *nChild*
| Index of the child key to derive.
| *bip32_tweak_out*
| Optional output receiving the BIP32 tweak applied.
|===


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