[#XOnlyPubKey-ComputeTapTweakHash]
= xref:XOnlyPubKey.adoc[XOnlyPubKey]::ComputeTapTweakHash
:relfileprefix: ../
:mrdocs:

Compute the Taproot tweak as specified in BIP341, with *this as internal key: ‐ if merkle_root == nullptr: H_TapTweak(xonly_pubkey) ‐ otherwise: H_TapTweak(xonly_pubkey || *merkle_root)

== Synopsis

Declared in `<pubkey.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:uint256.adoc[uint256]
ComputeTapTweakHash(xref:uint256.adoc[uint256] const* merkle_root) const;
----

== Description

Note that the behavior of this function with merkle_root != nullptr is consensus critical.

== Return Value

The computed Taproot tweak hash.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *merkle_root*
| Optional Merkle root mixed into the tweak (see above).
|===


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