[#node-BlockCreateOptions-block_reserved_weight]
= xref:node.adoc[node]::xref:node/BlockCreateOptions.adoc[BlockCreateOptions]::block_reserved_weight
:relfileprefix: ../../
:mrdocs:

The default reserved weight for the fixed‐size block header, transaction count and coinbase transaction. Minimum: 2000 weight units (MINIMUM_BLOCK_RESERVED_WEIGHT).

== Synopsis

Declared in `<node/mining_types.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional<uint64_t> block_reserved_weight = {};
----

== Description

Providing a value overrides the `‐blockreservedweight` startup setting. Cap'n Proto IPC clients currently cannot leave this field unset, so they always provide a value.


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