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

Connect a run of blocks toward the most‐work chain, one step of ActivateBestChain.

== Synopsis

Declared in `<validation.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[requires_capability(0x7f2e1ba854e8, 0x7f2e1ba85560), requires_capability(0x7f2e14565138, 0x7f2e145651b0), requires_capability(0x7f2e373be2e8, 0x7f2e373be360), requires_capability(0x7f2e36e34f38, 0x7f2e36e34fb0)]]
bool
ActivateBestChainStep(
    xref:BlockValidationState.adoc[BlockValidationState]& state,
    xref:CBlockIndex.adoc[CBlockIndex]& index_most_work,
    std::shared_ptr<CBlock const> const& pblock,
    bool& fInvalidFound,
    std::vector<ConnectedBlock>& connected_blocks);
----

== Return Value

true unless a system error occurred.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *state*
| Validation state updated with the reason for any failure.
| *index_most_work*
| Block index entry of the most‐work candidate to build toward.
| *pblock*
| Optional already‐loaded block to avoid re‐reading it from disk.
| *fInvalidFound*
| Set to true if an invalid block was found during the step.
| *connected_blocks*
| Collects the blocks connected during this step.
|===


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