[#txindex-02-TxHashKeyPrefix]
= xref:txindex-02.adoc[txindex]::TxHashKeyPrefix
:relfileprefix: ../
:mrdocs:

Integer type holding the truncated txid hash prefix of a key.

== Synopsis

Declared in `<index/txindex_key.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
using TxHashKeyPrefix = uint64_t;
----


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