[#BaseIndex-m_chain]
= xref:BaseIndex.adoc[BaseIndex]::m_chain
:relfileprefix: ../
:mrdocs:

Interface used to query the blockchain the index tracks.

== Synopsis

Declared in `<index/base.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::unique_ptr<interfaces::Chain> m_chain;
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