[#CBlockHeaderAndShortTxIDs-2constructor-07]
= xref:CBlockHeaderAndShortTxIDs.adoc[CBlockHeaderAndShortTxIDs]::CBlockHeaderAndShortTxIDs
:relfileprefix: ../
:mrdocs:

Builds the compact representation of a block.

== Synopsis

Declared in `<blockencodings.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
CBlockHeaderAndShortTxIDs(
    xref:CBlock.adoc[CBlock] const& block,
    uint64_t nonce);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *block* [in]
| The block to encode.
| *nonce* [in]
| This should be randomly generated, and is used for the siphash secret key
|===


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