[#Consensus-CheckTxInputs]
= xref:Consensus.adoc[Consensus]::CheckTxInputs
:relfileprefix: ../
:mrdocs:

Check whether all inputs of this transaction are valid (no double spends and amounts) This does not modify the UTXO set. This does not check scripts and sigs.

== Synopsis

Declared in `<consensus/tx_verify.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
bool
CheckTxInputs(
    xref:CTransaction.adoc[CTransaction] const& tx,
    xref:TxValidationState.adoc[TxValidationState]& state,
    xref:CCoinsViewCache.adoc[CCoinsViewCache] const& inputs,
    int nSpendHeight,
    xref:CAmount.adoc[CAmount]& txfee);
----

== Return Value

true if all inputs exist, are spendable, and amounts balance.

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *txfee* [out]
| Set to the transaction fee if successful. Preconditions: tx.IsCoinBase() is false.
| *tx*
| The non‐coinbase transaction whose inputs are checked.
| *state*
| Receives the validation result and rejection reason on failure.
| *inputs*
| UTXO set view providing the outputs spent by tx.
| *nSpendHeight*
| Height at which tx is being spent, used for maturity checks.
|===


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