[#ExternalSigner-SignTransaction]
= xref:ExternalSigner.adoc[ExternalSigner]::SignTransaction
:relfileprefix: ../
:mrdocs:

Sign PartiallySignedTransaction on the device. Calls `<command> ‐‐stdin ‐‐fingerprint <fingerprint> ‐‐chain <chain>` and passes the `signtx` command and PSBT via stdin.

== Synopsis

Declared in `<external_signer.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
SignTransaction(
    xref:PartiallySignedTransaction.adoc[PartiallySignedTransaction]& psbt,
    std::string& error);
----

== Return Value

true if the device signed the transaction successfully.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *psbt* [inout]
| PartiallySignedTransaction to be signed
| *error* [out]
| set to a human‐readable message when signing fails
|===


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