diff --git a/aggoracle/chaingersender/evm.go b/aggoracle/chaingersender/evm.go
index 5af3e443..ef9e1b75 100644
--- a/aggoracle/chaingersender/evm.go
+++ b/aggoracle/chaingersender/evm.go
@@ -132,10 +132,12 @@ func (c *EVMChainGERSender) InjectGER(ctx context.Context, ger common.Hash) erro
 			ethtxtypes.MonitoredTxStatusSent:
 			continue
 		case ethtxtypes.MonitoredTxStatusFailed:
-			return fmt.Errorf("tx %s failed", id.Hex())
+			return fmt.Errorf("inject GER tx %s failed", id.Hex())
 		case ethtxtypes.MonitoredTxStatusMined,
 			ethtxtypes.MonitoredTxStatusSafe,
 			ethtxtypes.MonitoredTxStatusFinalized:
+			c.logger.Debugf("inject GER tx %s was successfully mined at block %d", id.Hex(), res.MinedAtBlockNumber)
+
 			return nil
 		default:
 			c.logger.Error("unexpected tx status:", res.Status)
diff --git a/claimsponsor/evmclaimsponsor.go b/claimsponsor/evmclaimsponsor.go
index 6f315d94..10b073c3 100644
--- a/claimsponsor/evmclaimsponsor.go
+++ b/claimsponsor/evmclaimsponsor.go
@@ -174,6 +174,8 @@ func (c *EVMClaimSponsor) claimStatus(ctx context.Context, id string) (ClaimStat
 	case ethtxtypes.MonitoredTxStatusMined,
 		ethtxtypes.MonitoredTxStatusSafe,
 		ethtxtypes.MonitoredTxStatusFinalized:
+		log.Infof("claim tx with id %s mined at block %d", id, res.MinedAtBlockNumber)
+
 		return SuccessClaimStatus, nil
 	default:
 		return "", fmt.Errorf("unexpected tx status: %v", res.Status)
diff --git a/tree/tree.go b/tree/tree.go
index 6abb9e3d..51f88a6e 100644
--- a/tree/tree.go
+++ b/tree/tree.go
@@ -124,7 +124,7 @@ func (t *Tree) getRHTNode(tx db.Querier, nodeHash common.Hash) (*types.TreeNode,
 	node := &types.TreeNode{}
 	err := meddler.QueryRow(
 		tx, node,
-		fmt.Sprintf(`select * from %s where hash = $1`, t.rhtTable),
+		fmt.Sprintf(`SELECT * FROM %s WHERE hash = $1`, t.rhtTable),
 		nodeHash.String(),
 	)
 	if err != nil {
@@ -215,9 +215,9 @@ func (t *Tree) GetRootByIndex(ctx context.Context, index uint32) (types.Root, er
 
 // GetRootByHash returns the root associated to the hash
 func (t *Tree) GetRootByHash(ctx context.Context, hash common.Hash) (*types.Root, error) {
-	var root *types.Root
+	var root types.Root
 	if err := meddler.QueryRow(
-		t.db, root,
+		t.db, &root,
 		fmt.Sprintf(`SELECT * FROM %s WHERE hash = $1;`, t.rootTable),
 		hash.Hex(),
 	); err != nil {
@@ -226,7 +226,8 @@ func (t *Tree) GetRootByHash(ctx context.Context, hash common.Hash) (*types.Root
 		}
 		return nil, err
 	}
-	return root, nil
+
+	return &root, nil
 }
 
 func (t *Tree) GetLeaf(tx db.Querier, index uint32, root common.Hash) (common.Hash, error) {