3 files changed, 16 insertions, 10 deletions
diff --git a/core/test/app.go b/core/test/app.go
index 3ec670c..bf14d1b 100644
--- a/core/test/app.go
+++ b/core/test/app.go
@@ -96,9 +96,16 @@ func NewApp() *App {
 	}
 }
 
-// PrepareBlock implements Application interface.
-func (app *App) PrepareBlock(position types.Position) ([]byte, []byte) {
-	return []byte{}, []byte{}
+// PreparePayload implements Application interface.
+func (app *App) PreparePayload(position types.Position) []byte {
+	return []byte{}
+}
+
+// PrepareWitness implements Application interface.
+func (app *App) PrepareWitness(height uint64) types.Witness {
+	return types.Witness{
+		Height: height,
+	}
 }
 
 // VerifyBlock implements Application.
@@ -143,7 +150,7 @@ func (app *App) BlockDelivered(block types.Block) {
 	defer app.deliveredLock.Unlock()
 
 	app.Delivered[block.Hash] = &AppDeliveredRecord{
-		ConsensusTime: block.Witness.Timestamp,
+		ConsensusTime: block.ConsensusTimestamp,
 		When:          time.Now().UTC(),
 	}
 	app.DeliverSequence = append(app.DeliverSequence, block.Hash)
diff --git a/core/test/app_test.go b/core/test/app_test.go
index baea838..21d4e24 100644
--- a/core/test/app_test.go
+++ b/core/test/app_test.go
@@ -81,10 +81,9 @@ func (s *AppTestSuite) deliverBlock(
 	app *App, hash common.Hash, timestamp time.Time) {
 
 	app.BlockDelivered(types.Block{
-		Hash: hash,
-		Witness: types.Witness{
-			Timestamp: timestamp,
-		}})
+		Hash:               hash,
+		ConsensusTimestamp: timestamp,
+	})
 }
 
 func (s *AppTestSuite) TestCompare() {
diff --git a/core/test/stopper_test.go b/core/test/stopper_test.go
index de1c1a5..df207ec 100644
--- a/core/test/stopper_test.go
+++ b/core/test/stopper_test.go
@@ -62,8 +62,8 @@ func (s *StopperTestSuite) TestStopByConfirmedBlocks() {
 			app.TotalOrderingDelivered(hashes, false)
 			for _, h := range hashes {
 				app.BlockDelivered(types.Block{
-					Hash:    h,
-					Witness: types.Witness{Timestamp: time.Time{}}})
+					Hash:               h,
+					ConsensusTimestamp: time.Time{}})
 			}
 		}
 	}