diff --git a/grafeas/v1/build.proto b/grafeas/v1/build.proto
index 6ad8656d1..c0e9c7566 100644
--- a/grafeas/v1/build.proto
+++ b/grafeas/v1/build.proto
@@ -28,52 +28,6 @@ option objc_class_prefix = "GRA";
 message BuildNote {
   // Required. Immutable. Version of the builder which produced this build.
   string builder_version = 1;
-
-  // Signature of the build in occurrences pointing to this build note
-  // containing build details.
-  BuildSignature signature = 2;
-}
-
-// Message encapsulating the signature of the verified build.
-message BuildSignature {
-  // Public key of the builder which can be used to verify that the related
-  // findings are valid and unchanged. If `key_type` is empty, this defaults
-  // to PEM encoded public keys.
-  //
-  // This field may be empty if `key_id` references an external key.
-  //
-  // For Cloud Build based signatures, this is a PEM encoded public
-  // key. To verify the Cloud Build signature, place the contents of
-  // this field into a file (public.pem). The signature field is base64-decoded
-  // into its binary representation in signature.bin, and the provenance bytes
-  // from `BuildDetails` are base64-decoded into a binary representation in
-  // signed.bin. OpenSSL can then verify the signature:
-  // `openssl sha256 -verify public.pem -signature signature.bin signed.bin`
-  string public_key = 1;
-
-  // Required. Signature of the related `BuildProvenance`. In JSON, this is
-  // base-64 encoded.
-  bytes signature = 2;
-
-  // An ID for the key used to sign. This could be either an ID for the key
-  // stored in `public_key` (such as the ID or fingerprint for a PGP key, or the
-  // CN for a cert), or a reference to an external key (such as a reference to a
-  // key in Cloud Key Management Service).
-  string key_id = 3;
-
-  // Public key formats.
-  enum KeyType {
-    // `KeyType` is not set.
-    KEY_TYPE_UNSPECIFIED = 0;
-    // `PGP ASCII Armored` public key.
-    PGP_ASCII_ARMORED = 1;
-    // `PKIX PEM` public key.
-    PKIX_PEM = 2;
-  }
-
-  // The type of the key, either stored in `public_key` or referenced in
-  // `key_id`.
-  KeyType key_type = 4;
 }
 
 // Details of a build occurrence.
diff --git a/grafeas/v1/deployment.proto b/grafeas/v1/deployment.proto
index da35559f5..5204004fd 100644
--- a/grafeas/v1/deployment.proto
+++ b/grafeas/v1/deployment.proto
@@ -63,6 +63,4 @@ message DeploymentOccurrence {
   }
   // Platform hosting this deployment.
   Platform platform = 7;
-
-  // next_id = 8;
 }
diff --git a/grafeas/v1/provenance.proto b/grafeas/v1/provenance.proto
index 533c835ca..06b109785 100644
--- a/grafeas/v1/provenance.proto
+++ b/grafeas/v1/provenance.proto
@@ -104,16 +104,8 @@ message FileHashes {
 
 // Container message for hash values.
 message Hash {
-  // Specifies the hash algorithm.
-  enum HashType {
-    // Unknown.
-    HASH_TYPE_UNSPECIFIED = 0;
-    // A SHA-256 hash.
-    SHA256 = 1;
-  }
-
-  // Required. The type of hash that was performed.
-  HashType type = 1;
+  // Required. The type of hash that was performed, e.g. "SHA-256".
+  string type = 1;
   // Required. The hash value.
   bytes value = 2;
 }