[#GenericTransactionSignatureChecker-03-CheckSchnorrSignature]
= xref:GenericTransactionSignatureChecker-03.adoc[GenericTransactionSignatureChecker]::CheckSchnorrSignature
:relfileprefix: ../
:mrdocs:

Verify a Schnorr signature for this transaction's input.

== Synopsis

Declared in `<script/interpreter.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
bool
CheckSchnorrSignature(
    std::span<unsigned char const> sig,
    std::span<unsigned char const> pubkey,
    xref:SigVersion.adoc[SigVersion] sigversion,
    xref:ScriptExecutionData.adoc[ScriptExecutionData]& execdata,
    xref:ScriptError.adoc[ScriptError]* serror = nullptr) const override;
----

== Return Value

`true` if the signature is valid.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *sig*
| The 64‐ or 65‐byte Schnorr signature.
| *pubkey*
| The 32‐byte x‐only public key.
| *sigversion*
| The signature version selecting the hashing scheme.
| *execdata*
| Per‐input execution state used by the sighash.
| *serror*
| Set to the script error when verification fails.
|===


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