4 files changed, 11 insertions, 10 deletions
diff --git a/pkg/db/trillian.go b/pkg/db/trillian.go
index 25b2fb3..453a884 100644
--- a/pkg/db/trillian.go
+++ b/pkg/db/trillian.go
@@ -26,7 +26,7 @@ func (c *TrillianClient) AddLeaf(ctx context.Context, req *requests.Leaf) error
 	leaf := types.Leaf{
 		Statement: types.Statement{
 			ShardHint: req.ShardHint,
-			Checksum:  req.Checksum,
+			Checksum:  *types.HashFn(req.Preimage[:]),
 		},
 		Signature: req.Signature,
 		KeyHash:   *types.HashFn(req.VerificationKey[:]),
diff --git a/pkg/db/trillian_test.go b/pkg/db/trillian_test.go
index 955fc46..4dc561d 100644
--- a/pkg/db/trillian_test.go
+++ b/pkg/db/trillian_test.go
@@ -20,10 +20,8 @@ import (
 
 func TestAddLeaf(t *testing.T) {
 	req := &requests.Leaf{
-		Statement: types.Statement{
-			ShardHint: 0,
-			Checksum:  types.Hash{},
-		},
+		ShardHint:       0,
+		Preimage:        types.Hash{},
 		Signature:       types.Signature{},
 		VerificationKey: types.PublicKey{},
 		DomainHint:      "example.com",
diff --git a/pkg/instance/handler_test.go b/pkg/instance/handler_test.go
index f8817dc..8a48860 100644
--- a/pkg/instance/handler_test.go
+++ b/pkg/instance/handler_test.go
@@ -658,7 +658,7 @@ func mustHandle(t *testing.T, i Instance, e types.Endpoint) Handler {
 	return Handler{}
 }
 
-func mustLeafBuffer(t *testing.T, shardHint uint64, checksum types.Hash, wantSig bool) io.Reader {
+func mustLeafBuffer(t *testing.T, shardHint uint64, preimage types.Hash, wantSig bool) io.Reader {
 	t.Helper()
 
 	vk, sk, err := ed25519.GenerateKey(rand.Reader)
@@ -667,7 +667,7 @@ func mustLeafBuffer(t *testing.T, shardHint uint64, checksum types.Hash, wantSig
 	}
 	msg := types.Statement{
 		ShardHint: shardHint,
-		Checksum:  checksum,
+		Checksum:  *types.HashFn(preimage[:]),
 	}
 	sig := ed25519.Sign(sk, msg.ToBinary())
 	if !wantSig {
@@ -676,7 +676,7 @@ func mustLeafBuffer(t *testing.T, shardHint uint64, checksum types.Hash, wantSig
 	return bytes.NewBufferString(fmt.Sprintf(
 		"%s=%d\n"+"%s=%x\n"+"%s=%x\n"+"%s=%x\n"+"%s=%s\n",
 		"shard_hint", shardHint,
-		"checksum", checksum[:],
+		"preimage", preimage[:],
 		"signature", sig,
 		"verification_key", vk,
 		"domain_hint", "example.com",
diff --git a/pkg/instance/instance.go b/pkg/instance/instance.go
index bbd6cde..7ade955 100644
--- a/pkg/instance/instance.go
+++ b/pkg/instance/instance.go
@@ -56,8 +56,11 @@ func (i *Instance) leafRequestFromHTTP(ctx context.Context, r *http.Request) (*r
 	if err := req.FromASCII(r.Body); err != nil {
 		return nil, fmt.Errorf("FromASCII: %v", err)
 	}
-
-	if !req.Statement.Verify(&req.VerificationKey, &req.Signature) {
+	stmt := types.Statement{
+		ShardHint: req.ShardHint,
+		Checksum:  *types.HashFn(req.Preimage[:]),
+	}
+	if !stmt.Verify(&req.VerificationKey, &req.Signature) {
 		return nil, fmt.Errorf("invalid signature")
 	}
 	shardEnd := uint64(time.Now().Unix())