[#Chainstate-InvalidateBlock]
= xref:Chainstate.adoc[Chainstate]::InvalidateBlock
:relfileprefix: ../
:mrdocs:

Mark a block as invalid.

== Synopsis

Declared in `<validation.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[requires_capability(0x7fb95fa38628), locks_excluded(0x7fb95fa386f8), requires_capability(0x7fb96ac5f588), locks_excluded(0x7fb96ac5f658), requires_capability(0x7fb96e9d5da8), locks_excluded(0x7fb96e9d5e78), requires_capability(0x7fb98748b418), locks_excluded(0x7fb98748b4e8)]]
bool
InvalidateBlock(
    xref:BlockValidationState.adoc[BlockValidationState]& state,
    xref:CBlockIndex.adoc[CBlockIndex]* pindex);
----

== Return Value

true unless a system error occurred.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *state*
| Validation state updated with the reason for any failure.
| *pindex*
| Block index entry of the block to mark as invalid.
|===


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