[#node-BlockManager-ReadBlock-00]
= xref:node.adoc[node]::xref:node/BlockManager.adoc[BlockManager]::ReadBlock
:relfileprefix: ../../
:mrdocs:

Functions for disk access for blocks

== Synopsis

Declared in `<node/blockstorage.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
ReadBlock(
    xref:CBlock.adoc[CBlock]& block,
    xref:FlatFilePos.adoc[FlatFilePos] const& pos,
    std::optional<uint256> const& expected_hash) const;
----

== Return Value

True on success, false if the block could not be read or verified.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *block*
| Output filled with the deserialized block.
| *pos*
| Position of the serialized block on disk.
| *expected_hash*
| Expected block hash used to verify the read, if provided.
|===


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