diff --git a/hydra-node/src/Hydra/Chain.hs b/hydra-node/src/Hydra/Chain.hs
index 5ef704f9c46..6d931972f8b 100644
--- a/hydra-node/src/Hydra/Chain.hs
+++ b/hydra-node/src/Hydra/Chain.hs
@@ -244,8 +244,9 @@ data Chain tx m = Chain
       UTxOType tx ->
       tx ->
       m (Either (PostTxError tx) tx)
-  -- ^ Create a commit transaction using user provided utxos (zero or many) and
-  -- a _blueprint_ transaction. Errors are handled at the call site.
+  -- ^ Create a commit transaction using either user provided utxos (zero or many) or
+  -- a _blueprint_ transaction together with a 'UTxO' which resolves it.
+  -- Errors are handled at the call site.
   , submitTx :: MonadThrow m => tx -> m ()
   -- ^ Submit a cardano transaction.
   --
diff --git a/hydra-node/src/Hydra/Chain/Direct/Handlers.hs b/hydra-node/src/Hydra/Chain/Direct/Handlers.hs
index f0551d89ac9..b53908dabc6 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Handlers.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Handlers.hs
@@ -157,7 +157,7 @@ mkChain tracer queryTimeHandle wallet@TinyWallet{getUTxO} ctx LocalChainState{ge
           atomically (prepareTxToPost timeHandle wallet ctx spendableUTxO tx)
             >>= finalizeTx wallet ctx spendableUTxO mempty
         submitTx vtx
-    , -- Handle that creates a draft commit tx using the user utxo.
+    , -- Handle that creates a draft commit tx using the user utxo and a _blueprint_ transaction.
       -- Possible errors are handled at the api server level.
       draftCommitTx = \headId utxoToCommit blueprintTx -> do
         ChainStateAt{spendableUTxO} <- atomically getLatest
@@ -167,7 +167,7 @@ mkChain tracer queryTimeHandle wallet@TinyWallet{getUTxO} ctx LocalChainState{ge
         let matchedWalletUtxo = filter (`elem` walletTxIns) userTxIns
         -- prevent trying to spend internal wallet's utxo
         if null matchedWalletUtxo
-          then do
+          then
             traverse (finalizeTx wallet ctx spendableUTxO utxoToCommit) $
               commit' ctx headId spendableUTxO utxoToCommit blueprintTx
           else pure $ Left SpendingNodeUtxoForbidden
@@ -177,7 +177,6 @@ mkChain tracer queryTimeHandle wallet@TinyWallet{getUTxO} ctx LocalChainState{ge
     }
 
 -- | Balance and sign the given partial transaction.
--- TODO: remove tracing
 finalizeTx ::
   MonadThrow m =>
   TinyWallet m ->
diff --git a/hydra-node/src/Hydra/Chain/Direct/State.hs b/hydra-node/src/Hydra/Chain/Direct/State.hs
index 0bf5db86bf0..88ca04975df 100644
--- a/hydra-node/src/Hydra/Chain/Direct/State.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/State.hs
@@ -344,7 +344,7 @@ commit ctx headId spendableUTxO utxoToCommit =
    in commit' ctx headId spendableUTxO utxoToCommit blueprintTx
 
 -- | Construct a commit transaction based on known, spendable UTxO and some
--- arbitrary UTxOs to commit. This does look for "our initial output" to spend
+-- user UTxO inputs to commit. This does look for "our initial output" to spend
 -- and check the given 'UTxO' to be compatible. Hence, this function does fail
 -- if already committed or if the head is not initializing.
 --
@@ -354,16 +354,16 @@ commit' ::
   HeadId ->
   -- | Spendable 'UTxO'
   UTxO ->
-  -- | 'UTxO' to commit
+  -- | 'UTxO' inputs to commit.
   UTxO ->
   Tx ->
   Either (PostTxError Tx) Tx
-commit' ctx headId spendableUTxO utxoToCommit blueprintTx = do
+commit' ctx headId spendableUTxO utxo blueprintTx = do
   pid <- headIdToPolicyId headId ?> InvalidHeadId{headId}
   (i, o) <- ownInitial pid ?> CannotFindOwnInitial{knownUTxO = spendableUTxO}
-  rejectByronAddress utxoToCommit
-  rejectMoreThanMainnetLimit networkId utxoToCommit
-  pure $ commitTx networkId scriptRegistry headId ownParty utxoToCommit blueprintTx (i, o, vkh)
+  rejectByronAddress utxo
+  rejectMoreThanMainnetLimit networkId utxo
+  pure $ commitTx networkId scriptRegistry headId ownParty utxo blueprintTx (i, o, vkh)
  where
   ChainContext{networkId, ownParty, scriptRegistry, ownVerificationKey} = ctx
 
diff --git a/hydra-node/src/Hydra/Chain/Direct/Tx.hs b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
index 4cc623d0f3f..b2bc2081481 100644
--- a/hydra-node/src/Hydra/Chain/Direct/Tx.hs
+++ b/hydra-node/src/Hydra/Chain/Direct/Tx.hs
@@ -242,7 +242,7 @@ commitTx ::
   ScriptRegistry ->
   HeadId ->
   Party ->
-  -- | The UTxO to commit to the Head.
+  -- | The UTxO inputs to commit to the Head.
   UTxO ->
   -- | _Blueprint_ transaction.
   Tx ->
@@ -250,7 +250,7 @@ commitTx ::
   -- locked by initial script
   (TxIn, TxOut CtxUTxO, Hash PaymentKey) ->
   Tx
-commitTx networkId scriptRegistry headId party utxoToCommit blueprintTx (initialInput, out, vkh) =
+commitTx networkId scriptRegistry headId party utxo blueprintTx (initialInput, out, vkh) =
   let
     ledgerBlueprintTx =
       toLedgerTx blueprintTx
@@ -263,7 +263,7 @@ commitTx networkId scriptRegistry headId party utxoToCommit blueprintTx (initial
         & auxDataTxL .~ addMetadata txAuxMetadata
     existingWits = ledgerBlueprintTx ^. witsTxL
     currentInputs = ledgerBlueprintTx ^. bodyTxL . inputsTxBodyL
-    commitInputs = Set.map toLedgerTxIn (UTxO.inputSet utxoToCommit)
+    commitInputs = Set.map toLedgerTxIn (UTxO.inputSet utxo)
     blueprintRedeemers = unRedeemers $ toLedgerTx blueprintTx ^. witsTxL . rdmrsTxWitsL
     wits =
       witsTxL
@@ -285,7 +285,7 @@ commitTx networkId scriptRegistry headId party utxoToCommit blueprintTx (initial
             (Map.union languageMap languageMap')
 
   -- Re-Associate the redeemer indices present in some tx with the same inputs but different
-  -- indices in the current tx.
+  -- indices in the current (commit) tx.
   --
   -- We need this in order to be able to find the the _old_ tx redeemer and re-add
   -- it to the tx witnesses using the appropriate index of the _new_ tx input
@@ -325,7 +325,7 @@ commitTx networkId scriptRegistry headId party utxoToCommit blueprintTx (initial
       Initial.ViaCommit (toPlutusTxOutRef <$> committedTxIns)
 
   committedTxIns =
-    fst <$> UTxO.pairs utxoToCommit
+    fst <$> UTxO.pairs utxo
 
   commitOutput =
     TxOut commitAddress commitValue commitDatum ReferenceScriptNone
@@ -337,10 +337,10 @@ commitTx networkId scriptRegistry headId party utxoToCommit blueprintTx (initial
     mkScriptAddress @PlutusScriptV2 networkId commitScript
 
   commitValue =
-    txOutValue out <> foldMap txOutValue utxoToCommit
+    txOutValue out <> foldMap txOutValue utxo
 
   commitDatum =
-    mkTxOutDatumInline $ mkCommitDatum party utxoToCommit (headIdToCurrencySymbol headId)
+    mkTxOutDatumInline $ mkCommitDatum party utxo (headIdToCurrencySymbol headId)
 
   TxMetadata metadataMap = mkHydraHeadV1TxName "CommitTx"