[#CChainParams-SigNetOptions-challenge]
= xref:CChainParams.adoc[CChainParams]::xref:CChainParams/SigNetOptions.adoc[SigNetOptions]::challenge
:relfileprefix: ../../
:mrdocs:

Optional custom signet challenge script.

== Synopsis

Declared in `<kernel/chainparams.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional<std::vector<uint8_t>> challenge = {};
----


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