[#SignatureHashSchnorr]
= SignatureHashSchnorr
:mrdocs:

Compute the BIP341 Taproot signature hash for one input.

== Synopsis

Declared in `<script/interpreter.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename T>
bool
SignatureHashSchnorr(
    xref:uint256.adoc[uint256]& hash_out,
    xref:ScriptExecutionData.adoc[ScriptExecutionData]& execdata,
    T const& tx_to,
    uint32_t in_pos,
    uint8_t hash_type,
    xref:SigVersion.adoc[SigVersion] sigversion,
    xref:PrecomputedTransactionData.adoc[PrecomputedTransactionData] const& cache,
    xref:MissingDataBehavior.adoc[MissingDataBehavior] mdb);
----

== Return Value

`true` if the hash was computed successfully.

== Template Parameters

[cols="1,4"]
|===
| Name| Description
| *T*
| The transaction type being signed.
|===

== Parameters

[cols="1,4"]
|===
| Name| Description
| *hash_out*
| Receives the computed signature hash.
| *execdata*
| Per‐input execution state used by the sighash.
| *tx_to*
| The transaction whose input is being signed.
| *in_pos*
| Index of the input being signed.
| *hash_type*
| The sighash type byte.
| *sigversion*
| The signature version (TAPROOT or TAPSCRIPT).
| *cache*
| Precomputed transaction data required for Taproot.
| *mdb*
| How to react when required spent‐output data is missing.
|===


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