[#wallet-WalletBatch-WriteDescriptorLastHardenedCache]
= xref:wallet.adoc[wallet]::xref:wallet/WalletBatch.adoc[WalletBatch]::WriteDescriptorLastHardenedCache
:relfileprefix: ../../
:mrdocs:

Writes the last hardened extended public key into a descriptor's cache.

== Synopsis

Declared in `<wallet/walletdb.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
WriteDescriptorLastHardenedCache(
    xref:CExtPubKey.adoc[CExtPubKey] const& xpub,
    xref:uint256.adoc[uint256] const& desc_id,
    uint32_t key_exp_index);
----

== Return Value

true if the record was written.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *xpub*
| The extended public key to cache.
| *desc_id*
| The identifier of the descriptor.
| *key_exp_index*
| The key expression index within the descriptor.
|===


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