diff --git a/src/monitoring_tests/combinatorial_auction_surplus_test.py b/src/monitoring_tests/combinatorial_auction_surplus_test.py
index 377ec6c..4e82df4 100644
--- a/src/monitoring_tests/combinatorial_auction_surplus_test.py
+++ b/src/monitoring_tests/combinatorial_auction_surplus_test.py
@@ -88,7 +88,7 @@ def run_combinatorial_auction(self, competition_data: dict[str, Any]) -> bool:
         log_output = "\t".join(
             [
                 "Combinatorial auction surplus test:",
-                f"Tx Hash: {competition_data['transactionHash']}",
+                f"Tx Hash: {competition_data['transactionHashes'][0]}",
                 f"Winning Solver: {competition_data['solutions'][-1]['solver']}",
                 f"Winning surplus: {self.convert_fractions_to_floats(aggregate_solutions[-1])}",
                 f"Baseline surplus: {self.convert_fractions_to_floats(baseline_surplus)}",
diff --git a/src/monitoring_tests/high_score_test.py b/src/monitoring_tests/high_score_test.py
index c4eb085..b96ecd5 100644
--- a/src/monitoring_tests/high_score_test.py
+++ b/src/monitoring_tests/high_score_test.py
@@ -29,7 +29,7 @@ def compute_winning_score(self, competition_data: dict[str, Any]) -> bool:
         log_output = "\t".join(
             [
                 "Large score test:",
-                f"Tx Hash: {competition_data['transactionHash']}",
+                f"Tx Hash: {competition_data['transactionHashes'][0]}",
                 f"Winning Solver: {solution['solver']}",
                 f"Score in ETH: {score}",
             ]
diff --git a/src/monitoring_tests/reference_solver_surplus_test.py b/src/monitoring_tests/reference_solver_surplus_test.py
index a2d1c21..9c92303 100644
--- a/src/monitoring_tests/reference_solver_surplus_test.py
+++ b/src/monitoring_tests/reference_solver_surplus_test.py
@@ -75,7 +75,7 @@ def compare_orders_surplus(
             log_output = "\t".join(
                 [
                     "Reference solver surplus test:",
-                    f"Tx Hash: {competition_data['transactionHash']}",
+                    f"Tx Hash: {competition_data['transactionHashes'][0]}",
                     f"Order UID: {uid}",
                     f"Winning Solver: {solution['solver']}",
                     "Solver providing more surplus: Reference solver",
@@ -85,7 +85,7 @@ def compare_orders_surplus(
             )
             ref_solver_log = "\t".join(
                 [
-                    f"Tx Hash: {competition_data['transactionHash']}",
+                    f"Tx Hash: {competition_data['transactionHashes'][0]}",
                     f"Order UID: {uid}",
                     f"Solution providing more surplus: {ref_solver_response}",
                 ]
diff --git a/src/monitoring_tests/solver_competition_surplus_test.py b/src/monitoring_tests/solver_competition_surplus_test.py
index 1e191ec..05f6d66 100644
--- a/src/monitoring_tests/solver_competition_surplus_test.py
+++ b/src/monitoring_tests/solver_competition_surplus_test.py
@@ -58,7 +58,7 @@ def compare_orders_surplus(self, competition_data: dict[str, Any]) -> bool:
                 log_output = "\t".join(
                     [
                         "Solver competition surplus test:",
-                        f"Tx Hash: {competition_data['transactionHash']}",
+                        f"Tx Hash: {competition_data['transactionHashes'][0]}",
                         f"Order UID: {uid}",
                         f"Winning Solver: {solution['solver']}",
                         f"Solver providing more surplus: {solver_alt}",
diff --git a/src/monitoring_tests/uniform_directed_prices_test.py b/src/monitoring_tests/uniform_directed_prices_test.py
index bdee44b..f12f917 100644
--- a/src/monitoring_tests/uniform_directed_prices_test.py
+++ b/src/monitoring_tests/uniform_directed_prices_test.py
@@ -55,7 +55,7 @@ def check_udp(self, competition_data: dict[str, Any]) -> bool:
             log_output = "\t".join(
                 [
                     "Uniform Directed Prices test:",
-                    f"Tx Hash: {competition_data['transactionHash']}",
+                    f"Tx Hash: {competition_data['transactionHashes'][0]}",
                     f"Winning Solver: {solution['solver']}",
                     f"Token pair: {pair}",
                     f"Directional prices: {[float(p) for p in prices_list]}",