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

Key of a legacy (pre‐hashing) txindex row: the full txid under the 't' prefix.

== Synopsis

Declared in `<index/txindex_key.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::pair<uint8_t, uint256>
LegacyTxKey(xref:Txid.adoc[Txid] const& txid);
----

== Return Value

The prefix byte paired with the full txid.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *txid*
| Transaction id to build the key for.
|===


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