diff --git a/pkg/verify/interface.go b/pkg/verify/interface.go
index 6440554..c06310f 100644
--- a/pkg/verify/interface.go
+++ b/pkg/verify/interface.go
@@ -21,7 +21,6 @@ import (
 
 	in_toto "github.com/in-toto/attestation/go/v1"
 	"github.com/secure-systems-lab/go-securesystemslib/dsse"
-	protocommon "github.com/sigstore/protobuf-specs/gen/pb-go/common/v1"
 	"github.com/sigstore/sigstore-go/pkg/root"
 	"github.com/sigstore/sigstore-go/pkg/tlog"
 )
@@ -95,19 +94,21 @@ type EnvelopeContent interface {
 // that only implements a subset of the interfaces.
 type BaseSignedEntity struct{}
 
-func (b *BaseSignedEntity) VerificationProvider() (VerificationContent, error) {
-	return nil, errNotImplemented
+var _ SignedEntity = &BaseSignedEntity{}
+
+func (b *BaseSignedEntity) HasInclusionPromise() bool {
+	return false
 }
 
-func (b *BaseSignedEntity) Envelope() (*dsse.Envelope, error) {
-	return nil, errNotImplemented
+func (b *BaseSignedEntity) HasInclusionProof() bool {
+	return false
 }
 
-func (b *BaseSignedEntity) MessageSignature() (*protocommon.MessageSignature, error) {
+func (b *BaseSignedEntity) VerificationContent() (VerificationContent, error) {
 	return nil, errNotImplemented
 }
 
-func (b *BaseSignedEntity) Signature() ([]byte, error) {
+func (b *BaseSignedEntity) SignatureContent() (SignatureContent, error) {
 	return nil, errNotImplemented
 }