[#kernel-MemPoolOptions-max_datacarrier_bytes]
= xref:kernel.adoc[kernel]::xref:kernel/MemPoolOptions.adoc[MemPoolOptions]::max_datacarrier_bytes
:relfileprefix: ../../
:mrdocs:

A data carrying output is an unspendable output containing data. The script type is designated as TxoutType::NULL_DATA.

== Synopsis

Declared in `<kernel/mempool_options.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::optional<unsigned int> max_datacarrier_bytes = {DEFAULT_ACCEPT_DATACARRIER ? std::optional{MAX_OP_RETURN_RELAY} : std::nullopt};
----

== Description

Maximum size of TxoutType::NULL_DATA scripts that this node considers standard. If nullopt, any size is nonstandard.


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