[#CTxMemPool-StartBlockBuilding]
= xref:CTxMemPool.adoc[CTxMemPool]::StartBlockBuilding
:relfileprefix: ../
:mrdocs:

Begin building a block by creating the block builder from the transaction graph&period;

== Synopsis

Declared in `&lt;txmempool&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
&lsqb;&lsqb;requires&lowbar;capability(0x7f2e1b5a3df8), requires&lowbar;capability(0x7f2e2721ce08), requires&lowbar;capability(0x7f2e421ce518), requires&lowbar;capability(0x7f2e2880d4d8), requires&lowbar;capability(0x7f2e32130868), requires&lowbar;capability(0x7f2e347f8ef8), requires&lowbar;capability(0x7f2e2b05d368), requires&lowbar;capability(0x7f2e2bee4a08)&rsqb;&rsqb;
void
StartBlockBuilding() const;
----


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