[#Chainstate-m_from_snapshot_blockhash]
= xref:Chainstate.adoc[Chainstate]::m&lowbar;from&lowbar;snapshot&lowbar;blockhash
:relfileprefix: ../
:mrdocs:

The blockhash which is the base of the snapshot this chainstate was created from&period;

== Synopsis

Declared in `&lt;validation&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional&lt;uint256&gt; const m&lowbar;from&lowbar;snapshot&lowbar;blockhash;
----

== Description

std&colon;&colon;nullopt if this chainstate was not created from a snapshot&period;


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