[#MuSig2SessionID]
= MuSig2SessionID
:mrdocs:

Computes an arbitrary unique session ID to identify ongoing signing sessions. It is the SHA256 of the signing (aggregate) pubkey, the participant pubkey, the sighash, and the pubnonce

== Synopsis

Declared in `<musig.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:uint256.adoc[uint256]
MuSig2SessionID(
    xref:CPubKey.adoc[CPubKey] const& script_pubkey,
    xref:CPubKey.adoc[CPubKey] const& part_pubkey,
    xref:uint256.adoc[uint256] const& sighash,
    std::vector<uint8_t> const& pubnonce);
----

== Return Value

A unique session identifier derived from the inputs.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *script_pubkey*
| The signing (aggregate) public key for the session.
| *part_pubkey*
| The participant public key.
| *sighash*
| The signature hash being signed.
| *pubnonce*
| The serialized public nonce.
|===


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