[#SignatureHash]
= SignatureHash
:mrdocs:

Compute the signature hash for one input under the selected signature version.

== Synopsis

Declared in `<script/interpreter.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class T>
xref:uint256.adoc[uint256]
SignatureHash(
    xref:CScript.adoc[CScript] const& scriptCode,
    T const& txTo,
    unsigned int nIn,
    int32_t nHashType,
    xref:CAmount.adoc[CAmount] const& amount,
    xref:SigVersion.adoc[SigVersion] sigversion,
    xref:PrecomputedTransactionData.adoc[PrecomputedTransactionData] const* cache = nullptr,
    xref:SigHashCache.adoc[SigHashCache]* sighash_cache = nullptr);
----

== Return Value

The 256‐bit signature hash.

== Template Parameters

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

== Parameters

[cols="1,4"]
|===
| Name| Description
| *scriptCode*
| The script being executed for this input.
| *txTo*
| The transaction whose input is being signed.
| *nIn*
| Index of the input being signed.
| *nHashType*
| The sighash type byte controlling which parts are committed.
| *amount*
| The value of the output being spent.
| *sigversion*
| The signature version selecting the hashing scheme.
| *cache*
| Optional precomputed transaction data reused across inputs.
| *sighash_cache*
| Optional cache of SHA256 midstates for repeated computations.
|===


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