diff --git a/cosi.pb.go b/cosi.pb.go
index a002989..8e162e5 100644
--- a/cosi.pb.go
+++ b/cosi.pb.go
@@ -32,61 +32,6 @@ const (
 // of the legacy proto package is being used.
 const _ = proto.ProtoPackageIsVersion4
 
-type ProtocolName int32
-
-const (
-	ProtocolName_UnknownProtocol ProtocolName = 0
-	// S3, AWS S3 protocol
-	ProtocolName_S3 ProtocolName = 1
-	// AZURE, Microsoft Azure protocol
-	ProtocolName_AZURE ProtocolName = 2
-	// GCS, Google GCS protocol
-	ProtocolName_GCS ProtocolName = 3
-)
-
-// Enum value maps for ProtocolName.
-var (
-	ProtocolName_name = map[int32]string{
-		0: "UnknownProtocol",
-		1: "S3",
-		2: "AZURE",
-		3: "GCS",
-	}
-	ProtocolName_value = map[string]int32{
-		"UnknownProtocol": 0,
-		"S3":              1,
-		"AZURE":           2,
-		"GCS":             3,
-	}
-)
-
-func (x ProtocolName) Enum() *ProtocolName {
-	p := new(ProtocolName)
-	*p = x
-	return p
-}
-
-func (x ProtocolName) String() string {
-	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
-}
-
-func (ProtocolName) Descriptor() protoreflect.EnumDescriptor {
-	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes[0].Descriptor()
-}
-
-func (ProtocolName) Type() protoreflect.EnumType {
-	return &file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes[0]
-}
-
-func (x ProtocolName) Number() protoreflect.EnumNumber {
-	return protoreflect.EnumNumber(x)
-}
-
-// Deprecated: Use ProtocolName.Descriptor instead.
-func (ProtocolName) EnumDescriptor() ([]byte, []int) {
-	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{0}
-}
-
 // S3SignatureVersion is the version of the signing algorithm for all s3 requests
 type S3SignatureVersion int32
 
@@ -123,11 +68,11 @@ func (x S3SignatureVersion) String() string {
 }
 
 func (S3SignatureVersion) Descriptor() protoreflect.EnumDescriptor {
-	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes[1].Descriptor()
+	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes[0].Descriptor()
 }
 
 func (S3SignatureVersion) Type() protoreflect.EnumType {
-	return &file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes[1]
+	return &file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes[0]
 }
 
 func (x S3SignatureVersion) Number() protoreflect.EnumNumber {
@@ -136,7 +81,7 @@ func (x S3SignatureVersion) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use S3SignatureVersion.Descriptor instead.
 func (S3SignatureVersion) EnumDescriptor() ([]byte, []int) {
-	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{1}
+	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{0}
 }
 
 type AnonymousBucketAccessMode int32
@@ -182,11 +127,11 @@ func (x AnonymousBucketAccessMode) String() string {
 }
 
 func (AnonymousBucketAccessMode) Descriptor() protoreflect.EnumDescriptor {
-	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes[2].Descriptor()
+	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes[1].Descriptor()
 }
 
 func (AnonymousBucketAccessMode) Type() protoreflect.EnumType {
-	return &file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes[2]
+	return &file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes[1]
 }
 
 func (x AnonymousBucketAccessMode) Number() protoreflect.EnumNumber {
@@ -195,10 +140,10 @@ func (x AnonymousBucketAccessMode) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use AnonymousBucketAccessMode.Descriptor instead.
 func (AnonymousBucketAccessMode) EnumDescriptor() ([]byte, []int) {
-	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{2}
+	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{1}
 }
 
-type S3Parameters struct {
+type S3 struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
@@ -213,8 +158,8 @@ type S3Parameters struct {
 	SignatureVersion S3SignatureVersion `protobuf:"varint,4,opt,name=signature_version,json=signatureVersion,proto3,enum=cosi.v1alpha1.S3SignatureVersion" json:"signature_version,omitempty"`
 }
 
-func (x *S3Parameters) Reset() {
-	*x = S3Parameters{}
+func (x *S3) Reset() {
+	*x = S3{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_msgTypes[0]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -222,13 +167,13 @@ func (x *S3Parameters) Reset() {
 	}
 }
 
-func (x *S3Parameters) String() string {
+func (x *S3) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*S3Parameters) ProtoMessage() {}
+func (*S3) ProtoMessage() {}
 
-func (x *S3Parameters) ProtoReflect() protoreflect.Message {
+func (x *S3) ProtoReflect() protoreflect.Message {
 	mi := &file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_msgTypes[0]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -240,40 +185,40 @@ func (x *S3Parameters) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use S3Parameters.ProtoReflect.Descriptor instead.
-func (*S3Parameters) Descriptor() ([]byte, []int) {
+// Deprecated: Use S3.ProtoReflect.Descriptor instead.
+func (*S3) Descriptor() ([]byte, []int) {
 	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{0}
 }
 
-func (x *S3Parameters) GetEndpoint() string {
+func (x *S3) GetEndpoint() string {
 	if x != nil {
 		return x.Endpoint
 	}
 	return ""
 }
 
-func (x *S3Parameters) GetBucketName() string {
+func (x *S3) GetBucketName() string {
 	if x != nil {
 		return x.BucketName
 	}
 	return ""
 }
 
-func (x *S3Parameters) GetRegion() string {
+func (x *S3) GetRegion() string {
 	if x != nil {
 		return x.Region
 	}
 	return ""
 }
 
-func (x *S3Parameters) GetSignatureVersion() S3SignatureVersion {
+func (x *S3) GetSignatureVersion() S3SignatureVersion {
 	if x != nil {
 		return x.SignatureVersion
 	}
 	return S3SignatureVersion_UnknownSignature
 }
 
-type AzureBlobParameters struct {
+type AzureBlob struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
@@ -284,8 +229,8 @@ type AzureBlobParameters struct {
 	StorageAccount string `protobuf:"bytes,2,opt,name=storage_account,json=storageAccount,proto3" json:"storage_account,omitempty"`
 }
 
-func (x *AzureBlobParameters) Reset() {
-	*x = AzureBlobParameters{}
+func (x *AzureBlob) Reset() {
+	*x = AzureBlob{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_msgTypes[1]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -293,13 +238,13 @@ func (x *AzureBlobParameters) Reset() {
 	}
 }
 
-func (x *AzureBlobParameters) String() string {
+func (x *AzureBlob) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*AzureBlobParameters) ProtoMessage() {}
+func (*AzureBlob) ProtoMessage() {}
 
-func (x *AzureBlobParameters) ProtoReflect() protoreflect.Message {
+func (x *AzureBlob) ProtoReflect() protoreflect.Message {
 	mi := &file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_msgTypes[1]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -311,26 +256,26 @@ func (x *AzureBlobParameters) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use AzureBlobParameters.ProtoReflect.Descriptor instead.
-func (*AzureBlobParameters) Descriptor() ([]byte, []int) {
+// Deprecated: Use AzureBlob.ProtoReflect.Descriptor instead.
+func (*AzureBlob) Descriptor() ([]byte, []int) {
 	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{1}
 }
 
-func (x *AzureBlobParameters) GetContainerName() string {
+func (x *AzureBlob) GetContainerName() string {
 	if x != nil {
 		return x.ContainerName
 	}
 	return ""
 }
 
-func (x *AzureBlobParameters) GetStorageAccount() string {
+func (x *AzureBlob) GetStorageAccount() string {
 	if x != nil {
 		return x.StorageAccount
 	}
 	return ""
 }
 
-type GCSParameters struct {
+type GCS struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
@@ -345,8 +290,8 @@ type GCSParameters struct {
 	ServiceAccount string `protobuf:"bytes,4,opt,name=service_account,json=serviceAccount,proto3" json:"service_account,omitempty"`
 }
 
-func (x *GCSParameters) Reset() {
-	*x = GCSParameters{}
+func (x *GCS) Reset() {
+	*x = GCS{}
 	if protoimpl.UnsafeEnabled {
 		mi := &file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_msgTypes[2]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -354,13 +299,13 @@ func (x *GCSParameters) Reset() {
 	}
 }
 
-func (x *GCSParameters) String() string {
+func (x *GCS) String() string {
 	return protoimpl.X.MessageStringOf(x)
 }
 
-func (*GCSParameters) ProtoMessage() {}
+func (*GCS) ProtoMessage() {}
 
-func (x *GCSParameters) ProtoReflect() protoreflect.Message {
+func (x *GCS) ProtoReflect() protoreflect.Message {
 	mi := &file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_msgTypes[2]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
@@ -372,33 +317,33 @@ func (x *GCSParameters) ProtoReflect() protoreflect.Message {
 	return mi.MessageOf(x)
 }
 
-// Deprecated: Use GCSParameters.ProtoReflect.Descriptor instead.
-func (*GCSParameters) Descriptor() ([]byte, []int) {
+// Deprecated: Use GCS.ProtoReflect.Descriptor instead.
+func (*GCS) Descriptor() ([]byte, []int) {
 	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{2}
 }
 
-func (x *GCSParameters) GetBucketName() string {
+func (x *GCS) GetBucketName() string {
 	if x != nil {
 		return x.BucketName
 	}
 	return ""
 }
 
-func (x *GCSParameters) GetPrivateKeyName() string {
+func (x *GCS) GetPrivateKeyName() string {
 	if x != nil {
 		return x.PrivateKeyName
 	}
 	return ""
 }
 
-func (x *GCSParameters) GetProjectId() string {
+func (x *GCS) GetProjectId() string {
 	if x != nil {
 		return x.ProjectId
 	}
 	return ""
 }
 
-func (x *GCSParameters) GetServiceAccount() string {
+func (x *GCS) GetServiceAccount() string {
 	if x != nil {
 		return x.ServiceAccount
 	}
@@ -410,10 +355,6 @@ type Protocol struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	// ProtocolName is the name of the protocol
-	Name ProtocolName `protobuf:"varint,1,opt,name=name,proto3,enum=cosi.v1alpha1.ProtocolName" json:"name,omitempty"`
-	// version is the name of the protocol version
-	Version string `protobuf:"bytes,2,opt,name=version,proto3" json:"version,omitempty"`
 	// Types that are assignable to Type:
 	//	*Protocol_S3
 	//	*Protocol_AzureBlob
@@ -453,20 +394,6 @@ func (*Protocol) Descriptor() ([]byte, []int) {
 	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{3}
 }
 
-func (x *Protocol) GetName() ProtocolName {
-	if x != nil {
-		return x.Name
-	}
-	return ProtocolName_UnknownProtocol
-}
-
-func (x *Protocol) GetVersion() string {
-	if x != nil {
-		return x.Version
-	}
-	return ""
-}
-
 func (m *Protocol) GetType() isProtocol_Type {
 	if m != nil {
 		return m.Type
@@ -474,21 +401,21 @@ func (m *Protocol) GetType() isProtocol_Type {
 	return nil
 }
 
-func (x *Protocol) GetS3() *S3Parameters {
+func (x *Protocol) GetS3() *S3 {
 	if x, ok := x.GetType().(*Protocol_S3); ok {
 		return x.S3
 	}
 	return nil
 }
 
-func (x *Protocol) GetAzureBlob() *AzureBlobParameters {
+func (x *Protocol) GetAzureBlob() *AzureBlob {
 	if x, ok := x.GetType().(*Protocol_AzureBlob); ok {
 		return x.AzureBlob
 	}
 	return nil
 }
 
-func (x *Protocol) GetGcs() *GCSParameters {
+func (x *Protocol) GetGcs() *GCS {
 	if x, ok := x.GetType().(*Protocol_Gcs); ok {
 		return x.Gcs
 	}
@@ -500,15 +427,15 @@ type isProtocol_Type interface {
 }
 
 type Protocol_S3 struct {
-	S3 *S3Parameters `protobuf:"bytes,3,opt,name=s3,proto3,oneof"`
+	S3 *S3 `protobuf:"bytes,1,opt,name=s3,proto3,oneof"`
 }
 
 type Protocol_AzureBlob struct {
-	AzureBlob *AzureBlobParameters `protobuf:"bytes,4,opt,name=azureBlob,proto3,oneof"`
+	AzureBlob *AzureBlob `protobuf:"bytes,2,opt,name=azureBlob,proto3,oneof"`
 }
 
 type Protocol_Gcs struct {
-	Gcs *GCSParameters `protobuf:"bytes,5,opt,name=gcs,proto3,oneof"`
+	Gcs *GCS `protobuf:"bytes,3,opt,name=gcs,proto3,oneof"`
 }
 
 func (*Protocol_S3) isProtocol_Type() {}
@@ -615,16 +542,16 @@ type ProvisionerCreateBucketRequest struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
+	// This field is REQUIRED
+	// name specifies the name of the bucket that should be created.
+	Name string `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
 	// This field is REQUIRED
 	// Protocol specific information required by the call is passed in as key,value pairs.
-	Protocol *Protocol `protobuf:"bytes,1,opt,name=protocol,proto3" json:"protocol,omitempty"`
+	Protocol *Protocol `protobuf:"bytes,2,opt,name=protocol,proto3" json:"protocol,omitempty"`
 	// This field is OPTIONAL
 	// The caller should treat the values in parameters as opaque.
 	// The receiver is responsible for parsing and validating the values.
-	Parameters map[string]string `protobuf:"bytes,2,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	// This field is OPTIONAL
-	// Allow uncredentialed access to bucket.
-	AnonymousBucketAccessMode AnonymousBucketAccessMode `protobuf:"varint,3,opt,name=anonymous_bucket_access_mode,json=anonymousBucketAccessMode,proto3,enum=cosi.v1alpha1.AnonymousBucketAccessMode" json:"anonymous_bucket_access_mode,omitempty"`
+	Parameters map[string]string `protobuf:"bytes,3,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (x *ProvisionerCreateBucketRequest) Reset() {
@@ -659,6 +586,13 @@ func (*ProvisionerCreateBucketRequest) Descriptor() ([]byte, []int) {
 	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{6}
 }
 
+func (x *ProvisionerCreateBucketRequest) GetName() string {
+	if x != nil {
+		return x.Name
+	}
+	return ""
+}
+
 func (x *ProvisionerCreateBucketRequest) GetProtocol() *Protocol {
 	if x != nil {
 		return x.Protocol
@@ -673,17 +607,14 @@ func (x *ProvisionerCreateBucketRequest) GetParameters() map[string]string {
 	return nil
 }
 
-func (x *ProvisionerCreateBucketRequest) GetAnonymousBucketAccessMode() AnonymousBucketAccessMode {
-	if x != nil {
-		return x.AnonymousBucketAccessMode
-	}
-	return AnonymousBucketAccessMode_UnknownBucketAccessMode
-}
-
 type ProvisionerCreateBucketResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
+
+	// bucket_id returned here is expected to be the globally unique
+	// identifier for the bucket in the object storage provider
+	BucketId string `protobuf:"bytes,1,opt,name=bucket_id,json=bucketId,proto3" json:"bucket_id,omitempty"`
 }
 
 func (x *ProvisionerCreateBucketResponse) Reset() {
@@ -718,19 +649,22 @@ func (*ProvisionerCreateBucketResponse) Descriptor() ([]byte, []int) {
 	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{7}
 }
 
+func (x *ProvisionerCreateBucketResponse) GetBucketId() string {
+	if x != nil {
+		return x.BucketId
+	}
+	return ""
+}
+
 type ProvisionerDeleteBucketRequest struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
 	// This field is REQUIRED
-	// Protocol specific information required by the call is passed in as key,value pairs.
-	Protocol *Protocol `protobuf:"bytes,1,opt,name=protocol,proto3" json:"protocol,omitempty"`
-	// This field is OPTIONAL
-	// Protocol specific information required by the call is passed in as key,value pairs.
-	// The caller should treat the values in parameters as opaque.
-	// The receiver is responsible for parsing and validating the values.
-	Parameters map[string]string `protobuf:"bytes,2,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// bucket_id is a globally unique identifier for the bucket
+	// in the object storage provider
+	BucketId string `protobuf:"bytes,1,opt,name=bucket_id,json=bucketId,proto3" json:"bucket_id,omitempty"`
 }
 
 func (x *ProvisionerDeleteBucketRequest) Reset() {
@@ -765,18 +699,11 @@ func (*ProvisionerDeleteBucketRequest) Descriptor() ([]byte, []int) {
 	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{8}
 }
 
-func (x *ProvisionerDeleteBucketRequest) GetProtocol() *Protocol {
-	if x != nil {
-		return x.Protocol
-	}
-	return nil
-}
-
-func (x *ProvisionerDeleteBucketRequest) GetParameters() map[string]string {
+func (x *ProvisionerDeleteBucketRequest) GetBucketId() string {
 	if x != nil {
-		return x.Parameters
+		return x.BucketId
 	}
-	return nil
+	return ""
 }
 
 type ProvisionerDeleteBucketResponse struct {
@@ -823,17 +750,21 @@ type ProvisionerGrantBucketAccessRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	// This field is REQUIRED
-	// Protocol specific information required by the call is passed in as key,value pairs.
-	Protocol *Protocol `protobuf:"bytes,1,opt,name=protocol,proto3" json:"protocol,omitempty"`
-	// This field is OPTIONAL
-	// Protocol specific information required by the call is passed in as key,value pairs.
-	Parameters map[string]string `protobuf:"bytes,2,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
-	// This field is OPTIONAL
-	// Principal for which access is requested
-	Principal string `protobuf:"bytes,3,opt,name=principal,proto3" json:"principal,omitempty"`
+	// bucket_id is a globally unique identifier for the bucket
+	// in the object storage provider
+	BucketId string `protobuf:"bytes,1,opt,name=bucket_id,json=bucketId,proto3" json:"bucket_id,omitempty"`
+	// This field is REQUIRED
+	// account_name is a identifier for object storage provider
+	// to ensure that multiple requests for the same account
+	// result in only one access token being created
+	AccountName string `protobuf:"bytes,2,opt,name=account_name,json=accountName,proto3" json:"account_name,omitempty"`
 	// This field is REQUIRED
 	// Requested Access policy, ex: {"Effect":"Allow","Action":"s3:PutObject","Resource":"arn:aws:s3:::profilepics/*"}
-	AccessPolicy string `protobuf:"bytes,4,opt,name=access_policy,json=accessPolicy,proto3" json:"access_policy,omitempty"`
+	AccessPolicy string `protobuf:"bytes,3,opt,name=access_policy,json=accessPolicy,proto3" json:"access_policy,omitempty"`
+	// This field is OPTIONAL
+	// The caller should treat the values in parameters as opaque.
+	// The receiver is responsible for parsing and validating the values.
+	Parameters map[string]string `protobuf:"bytes,4,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (x *ProvisionerGrantBucketAccessRequest) Reset() {
@@ -868,32 +799,32 @@ func (*ProvisionerGrantBucketAccessRequest) Descriptor() ([]byte, []int) {
 	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{10}
 }
 
-func (x *ProvisionerGrantBucketAccessRequest) GetProtocol() *Protocol {
+func (x *ProvisionerGrantBucketAccessRequest) GetBucketId() string {
 	if x != nil {
-		return x.Protocol
+		return x.BucketId
 	}
-	return nil
+	return ""
 }
 
-func (x *ProvisionerGrantBucketAccessRequest) GetParameters() map[string]string {
+func (x *ProvisionerGrantBucketAccessRequest) GetAccountName() string {
 	if x != nil {
-		return x.Parameters
+		return x.AccountName
 	}
-	return nil
+	return ""
 }
 
-func (x *ProvisionerGrantBucketAccessRequest) GetPrincipal() string {
+func (x *ProvisionerGrantBucketAccessRequest) GetAccessPolicy() string {
 	if x != nil {
-		return x.Principal
+		return x.AccessPolicy
 	}
 	return ""
 }
 
-func (x *ProvisionerGrantBucketAccessRequest) GetAccessPolicy() string {
+func (x *ProvisionerGrantBucketAccessRequest) GetParameters() map[string]string {
 	if x != nil {
-		return x.AccessPolicy
+		return x.Parameters
 	}
-	return ""
+	return nil
 }
 
 type ProvisionerGrantBucketAccessResponse struct {
@@ -902,9 +833,9 @@ type ProvisionerGrantBucketAccessResponse struct {
 	unknownFields protoimpl.UnknownFields
 
 	// This field is OPTIONAL
-	// This is the account that is being provided access. This will
+	// This is the account_id that is being provided access. This will
 	// be required later to revoke access.
-	Principal string `protobuf:"bytes,1,opt,name=principal,proto3" json:"principal,omitempty"`
+	AccountId string `protobuf:"bytes,1,opt,name=account_id,json=accountId,proto3" json:"account_id,omitempty"`
 	// This field is OPTIONAL
 	// Contents of the credential file, ex: aws access key id and secret, etc.
 	CredentialsFileContents string `protobuf:"bytes,2,opt,name=credentials_file_contents,json=credentialsFileContents,proto3" json:"credentials_file_contents,omitempty"`
@@ -945,9 +876,9 @@ func (*ProvisionerGrantBucketAccessResponse) Descriptor() ([]byte, []int) {
 	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{11}
 }
 
-func (x *ProvisionerGrantBucketAccessResponse) GetPrincipal() string {
+func (x *ProvisionerGrantBucketAccessResponse) GetAccountId() string {
 	if x != nil {
-		return x.Principal
+		return x.AccountId
 	}
 	return ""
 }
@@ -972,14 +903,12 @@ type ProvisionerRevokeBucketAccessRequest struct {
 	unknownFields protoimpl.UnknownFields
 
 	// This field is REQUIRED
-	// Protocol specific information required by the call is passed in as key,value pairs.
-	Protocol *Protocol `protobuf:"bytes,1,opt,name=protocol,proto3" json:"protocol,omitempty"`
-	// This field is OPTIONAL
-	// Protocol specific information required by the call is passed in as key,value pairs.
-	Parameters map[string]string `protobuf:"bytes,2,rep,name=parameters,proto3" json:"parameters,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// bucket_id is a globally unique identifier for the bucket
+	// in the object storage provider.
+	BucketId string `protobuf:"bytes,1,opt,name=bucket_id,json=bucketId,proto3" json:"bucket_id,omitempty"`
 	// This field is REQUIRED
-	// This is the account that is being revoked access.
-	Principal string `protobuf:"bytes,3,opt,name=principal,proto3" json:"principal,omitempty"`
+	// This is the account_id that is having its access revoked.
+	AccountId string `protobuf:"bytes,2,opt,name=account_id,json=accountId,proto3" json:"account_id,omitempty"`
 }
 
 func (x *ProvisionerRevokeBucketAccessRequest) Reset() {
@@ -1014,23 +943,16 @@ func (*ProvisionerRevokeBucketAccessRequest) Descriptor() ([]byte, []int) {
 	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescGZIP(), []int{12}
 }
 
-func (x *ProvisionerRevokeBucketAccessRequest) GetProtocol() *Protocol {
+func (x *ProvisionerRevokeBucketAccessRequest) GetBucketId() string {
 	if x != nil {
-		return x.Protocol
+		return x.BucketId
 	}
-	return nil
-}
-
-func (x *ProvisionerRevokeBucketAccessRequest) GetParameters() map[string]string {
-	if x != nil {
-		return x.Parameters
-	}
-	return nil
+	return ""
 }
 
-func (x *ProvisionerRevokeBucketAccessRequest) GetPrincipal() string {
+func (x *ProvisionerRevokeBucketAccessRequest) GetAccountId() string {
 	if x != nil {
-		return x.Principal
+		return x.AccountId
 	}
 	return ""
 }
@@ -1207,241 +1129,200 @@ var file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDesc
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 }
 
 var (
@@ -1456,74 +1337,64 @@ func file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDesc
 	return file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDescData
 }
 
-var file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes = make([]protoimpl.EnumInfo, 3)
-var file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_msgTypes = make([]protoimpl.MessageInfo, 18)
+var file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
+var file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_msgTypes = make([]protoimpl.MessageInfo, 16)
 var file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_goTypes = []interface{}{
-	(ProtocolName)(0),                             // 0: cosi.v1alpha1.ProtocolName
-	(S3SignatureVersion)(0),                       // 1: cosi.v1alpha1.S3SignatureVersion
-	(AnonymousBucketAccessMode)(0),                // 2: cosi.v1alpha1.AnonymousBucketAccessMode
-	(*S3Parameters)(nil),                          // 3: cosi.v1alpha1.S3Parameters
-	(*AzureBlobParameters)(nil),                   // 4: cosi.v1alpha1.AzureBlobParameters
-	(*GCSParameters)(nil),                         // 5: cosi.v1alpha1.GCSParameters
-	(*Protocol)(nil),                              // 6: cosi.v1alpha1.Protocol
-	(*ProvisionerGetInfoRequest)(nil),             // 7: cosi.v1alpha1.ProvisionerGetInfoRequest
-	(*ProvisionerGetInfoResponse)(nil),            // 8: cosi.v1alpha1.ProvisionerGetInfoResponse
-	(*ProvisionerCreateBucketRequest)(nil),        // 9: cosi.v1alpha1.ProvisionerCreateBucketRequest
-	(*ProvisionerCreateBucketResponse)(nil),       // 10: cosi.v1alpha1.ProvisionerCreateBucketResponse
-	(*ProvisionerDeleteBucketRequest)(nil),        // 11: cosi.v1alpha1.ProvisionerDeleteBucketRequest
-	(*ProvisionerDeleteBucketResponse)(nil),       // 12: cosi.v1alpha1.ProvisionerDeleteBucketResponse
-	(*ProvisionerGrantBucketAccessRequest)(nil),   // 13: cosi.v1alpha1.ProvisionerGrantBucketAccessRequest
-	(*ProvisionerGrantBucketAccessResponse)(nil),  // 14: cosi.v1alpha1.ProvisionerGrantBucketAccessResponse
-	(*ProvisionerRevokeBucketAccessRequest)(nil),  // 15: cosi.v1alpha1.ProvisionerRevokeBucketAccessRequest
-	(*ProvisionerRevokeBucketAccessResponse)(nil), // 16: cosi.v1alpha1.ProvisionerRevokeBucketAccessResponse
-	nil,                                 // 17: cosi.v1alpha1.ProvisionerCreateBucketRequest.ParametersEntry
-	nil,                                 // 18: cosi.v1alpha1.ProvisionerDeleteBucketRequest.ParametersEntry
-	nil,                                 // 19: cosi.v1alpha1.ProvisionerGrantBucketAccessRequest.ParametersEntry
-	nil,                                 // 20: cosi.v1alpha1.ProvisionerRevokeBucketAccessRequest.ParametersEntry
-	(*descriptor.EnumOptions)(nil),      // 21: google.protobuf.EnumOptions
-	(*descriptor.EnumValueOptions)(nil), // 22: google.protobuf.EnumValueOptions
-	(*descriptor.FieldOptions)(nil),     // 23: google.protobuf.FieldOptions
-	(*descriptor.MessageOptions)(nil),   // 24: google.protobuf.MessageOptions
-	(*descriptor.MethodOptions)(nil),    // 25: google.protobuf.MethodOptions
-	(*descriptor.ServiceOptions)(nil),   // 26: google.protobuf.ServiceOptions
+	(S3SignatureVersion)(0),                       // 0: cosi.v1alpha1.S3SignatureVersion
+	(AnonymousBucketAccessMode)(0),                // 1: cosi.v1alpha1.AnonymousBucketAccessMode
+	(*S3)(nil),                                    // 2: cosi.v1alpha1.S3
+	(*AzureBlob)(nil),                             // 3: cosi.v1alpha1.AzureBlob
+	(*GCS)(nil),                                   // 4: cosi.v1alpha1.GCS
+	(*Protocol)(nil),                              // 5: cosi.v1alpha1.Protocol
+	(*ProvisionerGetInfoRequest)(nil),             // 6: cosi.v1alpha1.ProvisionerGetInfoRequest
+	(*ProvisionerGetInfoResponse)(nil),            // 7: cosi.v1alpha1.ProvisionerGetInfoResponse
+	(*ProvisionerCreateBucketRequest)(nil),        // 8: cosi.v1alpha1.ProvisionerCreateBucketRequest
+	(*ProvisionerCreateBucketResponse)(nil),       // 9: cosi.v1alpha1.ProvisionerCreateBucketResponse
+	(*ProvisionerDeleteBucketRequest)(nil),        // 10: cosi.v1alpha1.ProvisionerDeleteBucketRequest
+	(*ProvisionerDeleteBucketResponse)(nil),       // 11: cosi.v1alpha1.ProvisionerDeleteBucketResponse
+	(*ProvisionerGrantBucketAccessRequest)(nil),   // 12: cosi.v1alpha1.ProvisionerGrantBucketAccessRequest
+	(*ProvisionerGrantBucketAccessResponse)(nil),  // 13: cosi.v1alpha1.ProvisionerGrantBucketAccessResponse
+	(*ProvisionerRevokeBucketAccessRequest)(nil),  // 14: cosi.v1alpha1.ProvisionerRevokeBucketAccessRequest
+	(*ProvisionerRevokeBucketAccessResponse)(nil), // 15: cosi.v1alpha1.ProvisionerRevokeBucketAccessResponse
+	nil,                                 // 16: cosi.v1alpha1.ProvisionerCreateBucketRequest.ParametersEntry
+	nil,                                 // 17: cosi.v1alpha1.ProvisionerGrantBucketAccessRequest.ParametersEntry
+	(*descriptor.EnumOptions)(nil),      // 18: google.protobuf.EnumOptions
+	(*descriptor.EnumValueOptions)(nil), // 19: google.protobuf.EnumValueOptions
+	(*descriptor.FieldOptions)(nil),     // 20: google.protobuf.FieldOptions
+	(*descriptor.MessageOptions)(nil),   // 21: google.protobuf.MessageOptions
+	(*descriptor.MethodOptions)(nil),    // 22: google.protobuf.MethodOptions
+	(*descriptor.ServiceOptions)(nil),   // 23: google.protobuf.ServiceOptions
 }
 var file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_depIdxs = []int32{
-	1,  // 0: cosi.v1alpha1.S3Parameters.signature_version:type_name -> cosi.v1alpha1.S3SignatureVersion
-	0,  // 1: cosi.v1alpha1.Protocol.name:type_name -> cosi.v1alpha1.ProtocolName
-	3,  // 2: cosi.v1alpha1.Protocol.s3:type_name -> cosi.v1alpha1.S3Parameters
-	4,  // 3: cosi.v1alpha1.Protocol.azureBlob:type_name -> cosi.v1alpha1.AzureBlobParameters
-	5,  // 4: cosi.v1alpha1.Protocol.gcs:type_name -> cosi.v1alpha1.GCSParameters
-	6,  // 5: cosi.v1alpha1.ProvisionerCreateBucketRequest.protocol:type_name -> cosi.v1alpha1.Protocol
-	17, // 6: cosi.v1alpha1.ProvisionerCreateBucketRequest.parameters:type_name -> cosi.v1alpha1.ProvisionerCreateBucketRequest.ParametersEntry
-	2,  // 7: cosi.v1alpha1.ProvisionerCreateBucketRequest.anonymous_bucket_access_mode:type_name -> cosi.v1alpha1.AnonymousBucketAccessMode
-	6,  // 8: cosi.v1alpha1.ProvisionerDeleteBucketRequest.protocol:type_name -> cosi.v1alpha1.Protocol
-	18, // 9: cosi.v1alpha1.ProvisionerDeleteBucketRequest.parameters:type_name -> cosi.v1alpha1.ProvisionerDeleteBucketRequest.ParametersEntry
-	6,  // 10: cosi.v1alpha1.ProvisionerGrantBucketAccessRequest.protocol:type_name -> cosi.v1alpha1.Protocol
-	19, // 11: cosi.v1alpha1.ProvisionerGrantBucketAccessRequest.parameters:type_name -> cosi.v1alpha1.ProvisionerGrantBucketAccessRequest.ParametersEntry
-	6,  // 12: cosi.v1alpha1.ProvisionerRevokeBucketAccessRequest.protocol:type_name -> cosi.v1alpha1.Protocol
-	20, // 13: cosi.v1alpha1.ProvisionerRevokeBucketAccessRequest.parameters:type_name -> cosi.v1alpha1.ProvisionerRevokeBucketAccessRequest.ParametersEntry
-	21, // 14: cosi.v1alpha1.alpha_enum:extendee -> google.protobuf.EnumOptions
-	22, // 15: cosi.v1alpha1.alpha_enum_value:extendee -> google.protobuf.EnumValueOptions
-	23, // 16: cosi.v1alpha1.cosi_secret:extendee -> google.protobuf.FieldOptions
-	23, // 17: cosi.v1alpha1.alpha_field:extendee -> google.protobuf.FieldOptions
-	24, // 18: cosi.v1alpha1.alpha_message:extendee -> google.protobuf.MessageOptions
-	25, // 19: cosi.v1alpha1.alpha_method:extendee -> google.protobuf.MethodOptions
-	26, // 20: cosi.v1alpha1.alpha_service:extendee -> google.protobuf.ServiceOptions
-	7,  // 21: cosi.v1alpha1.Identity.ProvisionerGetInfo:input_type -> cosi.v1alpha1.ProvisionerGetInfoRequest
-	9,  // 22: cosi.v1alpha1.Provisioner.ProvisionerCreateBucket:input_type -> cosi.v1alpha1.ProvisionerCreateBucketRequest
-	11, // 23: cosi.v1alpha1.Provisioner.ProvisionerDeleteBucket:input_type -> cosi.v1alpha1.ProvisionerDeleteBucketRequest
-	13, // 24: cosi.v1alpha1.Provisioner.ProvisionerGrantBucketAccess:input_type -> cosi.v1alpha1.ProvisionerGrantBucketAccessRequest
-	15, // 25: cosi.v1alpha1.Provisioner.ProvisionerRevokeBucketAccess:input_type -> cosi.v1alpha1.ProvisionerRevokeBucketAccessRequest
-	8,  // 26: cosi.v1alpha1.Identity.ProvisionerGetInfo:output_type -> cosi.v1alpha1.ProvisionerGetInfoResponse
-	10, // 27: cosi.v1alpha1.Provisioner.ProvisionerCreateBucket:output_type -> cosi.v1alpha1.ProvisionerCreateBucketResponse
-	12, // 28: cosi.v1alpha1.Provisioner.ProvisionerDeleteBucket:output_type -> cosi.v1alpha1.ProvisionerDeleteBucketResponse
-	14, // 29: cosi.v1alpha1.Provisioner.ProvisionerGrantBucketAccess:output_type -> cosi.v1alpha1.ProvisionerGrantBucketAccessResponse
-	16, // 30: cosi.v1alpha1.Provisioner.ProvisionerRevokeBucketAccess:output_type -> cosi.v1alpha1.ProvisionerRevokeBucketAccessResponse
-	26, // [26:31] is the sub-list for method output_type
-	21, // [21:26] is the sub-list for method input_type
-	21, // [21:21] is the sub-list for extension type_name
-	14, // [14:21] is the sub-list for extension extendee
-	0,  // [0:14] is the sub-list for field type_name
+	0,  // 0: cosi.v1alpha1.S3.signature_version:type_name -> cosi.v1alpha1.S3SignatureVersion
+	2,  // 1: cosi.v1alpha1.Protocol.s3:type_name -> cosi.v1alpha1.S3
+	3,  // 2: cosi.v1alpha1.Protocol.azureBlob:type_name -> cosi.v1alpha1.AzureBlob
+	4,  // 3: cosi.v1alpha1.Protocol.gcs:type_name -> cosi.v1alpha1.GCS
+	5,  // 4: cosi.v1alpha1.ProvisionerCreateBucketRequest.protocol:type_name -> cosi.v1alpha1.Protocol
+	16, // 5: cosi.v1alpha1.ProvisionerCreateBucketRequest.parameters:type_name -> cosi.v1alpha1.ProvisionerCreateBucketRequest.ParametersEntry
+	17, // 6: cosi.v1alpha1.ProvisionerGrantBucketAccessRequest.parameters:type_name -> cosi.v1alpha1.ProvisionerGrantBucketAccessRequest.ParametersEntry
+	18, // 7: cosi.v1alpha1.alpha_enum:extendee -> google.protobuf.EnumOptions
+	19, // 8: cosi.v1alpha1.alpha_enum_value:extendee -> google.protobuf.EnumValueOptions
+	20, // 9: cosi.v1alpha1.cosi_secret:extendee -> google.protobuf.FieldOptions
+	20, // 10: cosi.v1alpha1.alpha_field:extendee -> google.protobuf.FieldOptions
+	21, // 11: cosi.v1alpha1.alpha_message:extendee -> google.protobuf.MessageOptions
+	22, // 12: cosi.v1alpha1.alpha_method:extendee -> google.protobuf.MethodOptions
+	23, // 13: cosi.v1alpha1.alpha_service:extendee -> google.protobuf.ServiceOptions
+	6,  // 14: cosi.v1alpha1.Identity.ProvisionerGetInfo:input_type -> cosi.v1alpha1.ProvisionerGetInfoRequest
+	8,  // 15: cosi.v1alpha1.Provisioner.ProvisionerCreateBucket:input_type -> cosi.v1alpha1.ProvisionerCreateBucketRequest
+	10, // 16: cosi.v1alpha1.Provisioner.ProvisionerDeleteBucket:input_type -> cosi.v1alpha1.ProvisionerDeleteBucketRequest
+	12, // 17: cosi.v1alpha1.Provisioner.ProvisionerGrantBucketAccess:input_type -> cosi.v1alpha1.ProvisionerGrantBucketAccessRequest
+	14, // 18: cosi.v1alpha1.Provisioner.ProvisionerRevokeBucketAccess:input_type -> cosi.v1alpha1.ProvisionerRevokeBucketAccessRequest
+	7,  // 19: cosi.v1alpha1.Identity.ProvisionerGetInfo:output_type -> cosi.v1alpha1.ProvisionerGetInfoResponse
+	9,  // 20: cosi.v1alpha1.Provisioner.ProvisionerCreateBucket:output_type -> cosi.v1alpha1.ProvisionerCreateBucketResponse
+	11, // 21: cosi.v1alpha1.Provisioner.ProvisionerDeleteBucket:output_type -> cosi.v1alpha1.ProvisionerDeleteBucketResponse
+	13, // 22: cosi.v1alpha1.Provisioner.ProvisionerGrantBucketAccess:output_type -> cosi.v1alpha1.ProvisionerGrantBucketAccessResponse
+	15, // 23: cosi.v1alpha1.Provisioner.ProvisionerRevokeBucketAccess:output_type -> cosi.v1alpha1.ProvisionerRevokeBucketAccessResponse
+	19, // [19:24] is the sub-list for method output_type
+	14, // [14:19] is the sub-list for method input_type
+	14, // [14:14] is the sub-list for extension type_name
+	7,  // [7:14] is the sub-list for extension extendee
+	0,  // [0:7] is the sub-list for field type_name
 }
 
 func init() { file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_init() }
@@ -1533,7 +1404,7 @@ func file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_init()
 	}
 	if !protoimpl.UnsafeEnabled {
 		file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*S3Parameters); i {
+			switch v := v.(*S3); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1545,7 +1416,7 @@ func file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_init()
 			}
 		}
 		file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*AzureBlobParameters); i {
+			switch v := v.(*AzureBlob); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1557,7 +1428,7 @@ func file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_init()
 			}
 		}
 		file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*GCSParameters); i {
+			switch v := v.(*GCS); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1711,8 +1582,8 @@ func file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_init()
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_sigs_k8s_io_container_object_storage_interface_spec_cosi_proto_rawDesc,
-			NumEnums:      3,
-			NumMessages:   18,
+			NumEnums:      2,
+			NumMessages:   16,
 			NumExtensions: 7,
 			NumServices:   2,
 		},
diff --git a/cosi.pb.json.go b/cosi.pb.json.go
index 0a4fc69..57bd9cf 100644
--- a/cosi.pb.json.go
+++ b/cosi.pb.json.go
@@ -10,7 +10,7 @@ import (
 )
 
 // MarshalJSON implements json.Marshaler
-func (msg *S3Parameters) MarshalJSON() ([]byte, error) {
+func (msg *S3) MarshalJSON() ([]byte, error) {
 	var buf bytes.Buffer
 	err := (&jsonpb.Marshaler{
 		EnumsAsInts:  false,
@@ -21,14 +21,14 @@ func (msg *S3Parameters) MarshalJSON() ([]byte, error) {
 }
 
 // UnmarshalJSON implements json.Unmarshaler
-func (msg *S3Parameters) UnmarshalJSON(b []byte) error {
+func (msg *S3) UnmarshalJSON(b []byte) error {
 	return (&jsonpb.Unmarshaler{
 		AllowUnknownFields: false,
 	}).Unmarshal(bytes.NewReader(b), msg)
 }
 
 // MarshalJSON implements json.Marshaler
-func (msg *AzureBlobParameters) MarshalJSON() ([]byte, error) {
+func (msg *AzureBlob) MarshalJSON() ([]byte, error) {
 	var buf bytes.Buffer
 	err := (&jsonpb.Marshaler{
 		EnumsAsInts:  false,
@@ -39,14 +39,14 @@ func (msg *AzureBlobParameters) MarshalJSON() ([]byte, error) {
 }
 
 // UnmarshalJSON implements json.Unmarshaler
-func (msg *AzureBlobParameters) UnmarshalJSON(b []byte) error {
+func (msg *AzureBlob) UnmarshalJSON(b []byte) error {
 	return (&jsonpb.Unmarshaler{
 		AllowUnknownFields: false,
 	}).Unmarshal(bytes.NewReader(b), msg)
 }
 
 // MarshalJSON implements json.Marshaler
-func (msg *GCSParameters) MarshalJSON() ([]byte, error) {
+func (msg *GCS) MarshalJSON() ([]byte, error) {
 	var buf bytes.Buffer
 	err := (&jsonpb.Marshaler{
 		EnumsAsInts:  false,
@@ -57,7 +57,7 @@ func (msg *GCSParameters) MarshalJSON() ([]byte, error) {
 }
 
 // UnmarshalJSON implements json.Unmarshaler
-func (msg *GCSParameters) UnmarshalJSON(b []byte) error {
+func (msg *GCS) UnmarshalJSON(b []byte) error {
 	return (&jsonpb.Unmarshaler{
 		AllowUnknownFields: false,
 	}).Unmarshal(bytes.NewReader(b), msg)
diff --git a/cosi.proto b/cosi.proto
index d55a5b6..a0e8c20 100644
--- a/cosi.proto
+++ b/cosi.proto
@@ -77,16 +77,6 @@ service Provisioner {
     rpc ProvisionerRevokeBucketAccess (ProvisionerRevokeBucketAccessRequest) returns (ProvisionerRevokeBucketAccessResponse);
 }
 
-enum ProtocolName {
-    UnknownProtocol = 0;
-    // S3, AWS S3 protocol
-    S3 = 1;
-    // AZURE, Microsoft Azure protocol
-    AZURE = 2;
-    // GCS, Google GCS protocol
-    GCS = 3;
-}
-
 // S3SignatureVersion is the version of the signing algorithm for all s3 requests
 enum S3SignatureVersion {
     UnknownSignature = 0;
@@ -108,7 +98,7 @@ enum AnonymousBucketAccessMode {
     ReadWrite = 4;
 }
 
-message S3Parameters {
+message S3 {
     // endpoint denotes the URL of the S3 server
     string endpoint = 1;
     // bucket_name denotes the name of the bucket in the storage backend
@@ -119,14 +109,14 @@ message S3Parameters {
     S3SignatureVersion signature_version = 4;
 }
 
-message AzureBlobParameters {
+message AzureBlob {
     // container_name is the name of the azure container
     string container_name = 1;
     // storage_account is the id of the azure storage account
     string storage_account = 2;
 }
 
-message GCSParameters {
+message GCS {
     // bucket_name denotes the name of the bucket in the storage backend
     string bucket_name = 1;
     // private_key_name denotes the name of the private key in the storage backend
@@ -138,15 +128,10 @@ message GCSParameters {
 }
 
 message Protocol {
-    // ProtocolName is the name of the protocol
-    ProtocolName name = 1;
-    // version is the name of the protocol version
-    string version = 2;
-
     oneof type {
-        S3Parameters s3 = 3;
-        AzureBlobParameters azureBlob = 4;
-        GCSParameters gcs = 5;
+        S3 s3 = 1;
+        AzureBlob azureBlob = 2;
+        GCS gcs = 3;
     }
 }
 
@@ -167,34 +152,31 @@ message ProvisionerGetInfoResponse {
 }
 
 message ProvisionerCreateBucketRequest {    
+    // This field is REQUIRED
+    // name specifies the name of the bucket that should be created.
+    string name = 1;
+
     // This field is REQUIRED
     // Protocol specific information required by the call is passed in as key,value pairs.
-    Protocol protocol = 1;
+    Protocol protocol = 2;
 
     // This field is OPTIONAL
     // The caller should treat the values in parameters as opaque. 
     // The receiver is responsible for parsing and validating the values.
-    map<string,string> parameters = 2;
-
-    // This field is OPTIONAL
-    // Allow uncredentialed access to bucket.
-    AnonymousBucketAccessMode anonymous_bucket_access_mode = 3;
+    map<string,string> parameters = 3;
 }
 
 message ProvisionerCreateBucketResponse {
-    // Intentionally left blank
+    // bucket_id returned here is expected to be the globally unique 
+    // identifier for the bucket in the object storage provider 
+    string bucket_id = 1;
 }
 
 message ProvisionerDeleteBucketRequest {
     // This field is REQUIRED
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    Protocol protocol = 1;
-
-    // This field is OPTIONAL
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    // The caller should treat the values in parameters as opaque. 
-    // The receiver is responsible for parsing and validating the values.
-    map<string,string> parameters = 2;
+    // bucket_id is a globally unique identifier for the bucket
+    // in the object storage provider 
+    string bucket_id = 1;
 }
 
 message ProvisionerDeleteBucketResponse {
@@ -203,27 +185,31 @@ message ProvisionerDeleteBucketResponse {
 
 message ProvisionerGrantBucketAccessRequest {
     // This field is REQUIRED
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    Protocol protocol = 1;
-
-    // This field is OPTIONAL
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    map<string,string> parameters = 2;
+    // bucket_id is a globally unique identifier for the bucket
+    // in the object storage provider 
+    string bucket_id = 1;
 
-    // This field is OPTIONAL
-    // Principal for which access is requested
-    string principal = 3;
+    // This field is REQUIRED
+    // account_name is a identifier for object storage provider 
+    // to ensure that multiple requests for the same account
+    // result in only one access token being created
+    string account_name = 2;
 
     // This field is REQUIRED
     // Requested Access policy, ex: {"Effect":"Allow","Action":"s3:PutObject","Resource":"arn:aws:s3:::profilepics/*"}
-    string access_policy = 4;
+    string access_policy = 3;
+
+    // This field is OPTIONAL
+    // The caller should treat the values in parameters as opaque. 
+    // The receiver is responsible for parsing and validating the values.
+    map<string,string> parameters = 4;
 }
 
 message ProvisionerGrantBucketAccessResponse {
     // This field is OPTIONAL
-    // This is the account that is being provided access. This will
+    // This is the account_id that is being provided access. This will
     // be required later to revoke access. 
-    string principal = 1;
+    string account_id = 1;
 
     // This field is OPTIONAL
     // Contents of the credential file, ex: aws access key id and secret, etc.
@@ -236,16 +222,13 @@ message ProvisionerGrantBucketAccessResponse {
  
 message ProvisionerRevokeBucketAccessRequest {
     // This field is REQUIRED
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    Protocol protocol = 1;
-
-    // This field is OPTIONAL
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    map<string,string> parameters = 2;
+    // bucket_id is a globally unique identifier for the bucket
+    // in the object storage provider.
+    string bucket_id = 1;
 
     // This field is REQUIRED
-    // This is the account that is being revoked access.
-    string principal = 3;
+    // This is the account_id that is having its access revoked.
+    string account_id = 2;
 }
 
 message ProvisionerRevokeBucketAccessResponse {
diff --git a/spec.md b/spec.md
index 46ddfd8..5a4e349 100644
--- a/spec.md
+++ b/spec.md
@@ -205,16 +205,6 @@ service Provisioner {
     rpc ProvisionerRevokeBucketAccess (ProvisionerRevokeBucketAccessRequest) returns (ProvisionerRevokeBucketAccessResponse);
 }
 
-enum ProtocolName {
-    UnknownProtocol = 0;
-    // S3, AWS S3 protocol
-    S3 = 1;
-    // AZURE, Microsoft Azure protocol
-    AZURE = 2;
-    // GCS, Google GCS protocol
-    GCS = 3;
-}
-
 // S3SignatureVersion is the version of the signing algorithm for all s3 requests
 enum S3SignatureVersion {
     UnknownSignature = 0;
@@ -236,7 +226,7 @@ enum AnonymousBucketAccessMode {
     ReadWrite = 4;
 }
 
-message S3Parameters {
+message S3 {
     // endpoint denotes the URL of the S3 server
     string endpoint = 1;
     // bucket_name denotes the name of the bucket in the storage backend
@@ -247,14 +237,14 @@ message S3Parameters {
     S3SignatureVersion signature_version = 4;
 }
 
-message AzureBlobParameters {
+message AzureBlob {
     // container_name is the name of the azure container
     string container_name = 1;
     // storage_account is the id of the azure storage account
     string storage_account = 2;
 }
 
-message GCSParameters {
+message GCS {
     // bucket_name denotes the name of the bucket in the storage backend
     string bucket_name = 1;
     // private_key_name denotes the name of the private key in the storage backend
@@ -266,15 +256,10 @@ message GCSParameters {
 }
 
 message Protocol {
-    // ProtocolName is the name of the protocol
-    ProtocolName name = 1;
-    // version is the name of the protocol version
-    string version = 2;
-
     oneof type {
-        S3Parameters s3 = 3;
-        AzureBlobParameters azureBlob = 4;
-        GCSParameters gcs = 5;
+        S3 s3 = 1;
+        AzureBlob azureBlob = 2;
+        GCS gcs = 3;
     }
 }
 
@@ -295,34 +280,31 @@ message ProvisionerGetInfoResponse {
 }
 
 message ProvisionerCreateBucketRequest {    
+    // This field is REQUIRED
+    // name specifies the name of the bucket that should be created.
+    string name = 1;
+
     // This field is REQUIRED
     // Protocol specific information required by the call is passed in as key,value pairs.
-    Protocol protocol = 1;
+    Protocol protocol = 2;
 
     // This field is OPTIONAL
     // The caller should treat the values in parameters as opaque. 
     // The receiver is responsible for parsing and validating the values.
-    map<string,string> parameters = 2;
-
-    // This field is OPTIONAL
-    // Allow uncredentialed access to bucket.
-    AnonymousBucketAccessMode anonymous_bucket_access_mode = 3;
+    map<string,string> parameters = 3;
 }
 
 message ProvisionerCreateBucketResponse {
-    // Intentionally left blank
+    // bucket_id returned here is expected to be the globally unique 
+    // identifier for the bucket in the object storage provider 
+    string bucket_id = 1;
 }
 
 message ProvisionerDeleteBucketRequest {
     // This field is REQUIRED
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    Protocol protocol = 1;
-
-    // This field is OPTIONAL
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    // The caller should treat the values in parameters as opaque. 
-    // The receiver is responsible for parsing and validating the values.
-    map<string,string> parameters = 2;
+    // bucket_id is a globally unique identifier for the bucket
+    // in the object storage provider 
+    string bucket_id = 1;
 }
 
 message ProvisionerDeleteBucketResponse {
@@ -331,27 +313,31 @@ message ProvisionerDeleteBucketResponse {
 
 message ProvisionerGrantBucketAccessRequest {
     // This field is REQUIRED
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    Protocol protocol = 1;
+    // bucket_id is a globally unique identifier for the bucket
+    // in the object storage provider 
+    string bucket_id = 1;
 
-    // This field is OPTIONAL
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    map<string,string> parameters = 2;
-
-    // This field is OPTIONAL
-    // Principal for which access is requested
-    string principal = 3;
+    // This field is REQUIRED
+    // account_name is a identifier for object storage provider 
+    // to ensure that multiple requests for the same account
+    // result in only one access token being created
+    string account_name = 2;
 
     // This field is REQUIRED
     // Requested Access policy, ex: {"Effect":"Allow","Action":"s3:PutObject","Resource":"arn:aws:s3:::profilepics/*"}
-    string access_policy = 4;
+    string access_policy = 3;
+
+    // This field is OPTIONAL
+    // The caller should treat the values in parameters as opaque. 
+    // The receiver is responsible for parsing and validating the values.
+    map<string,string> parameters = 4;
 }
 
 message ProvisionerGrantBucketAccessResponse {
     // This field is OPTIONAL
-    // This is the account that is being provided access. This will
+    // This is the account_id that is being provided access. This will
     // be required later to revoke access. 
-    string principal = 1;
+    string account_id = 1;
 
     // This field is OPTIONAL
     // Contents of the credential file, ex: aws access key id and secret, etc.
@@ -364,16 +350,13 @@ message ProvisionerGrantBucketAccessResponse {
  
 message ProvisionerRevokeBucketAccessRequest {
     // This field is REQUIRED
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    Protocol protocol = 1;
-
-    // This field is OPTIONAL
-    // Protocol specific information required by the call is passed in as key,value pairs.
-    map<string,string> parameters = 2;
+    // bucket_id is a globally unique identifier for the bucket
+    // in the object storage provider.
+    string bucket_id = 1;
 
     // This field is REQUIRED
-    // This is the account that is being revoked access.
-    string principal = 3;
+    // This is the account_id that is having its access revoked.
+    string account_id = 2;
 }
 
 message ProvisionerRevokeBucketAccessResponse {
@@ -489,17 +472,6 @@ message ProvisionerCreateBucketRequest {
     // This field is OPTIONAL
     // Protocol specific information required by the call is passed in as key,value pairs.
     map<string,string> bucket_context = 2;
-
-    enum AnonymousBucketAccessMode {
-	BUCKET_PRIVATE = 0;
-	BUCKET_READ_ONLY = 1;
-	BUCKET_WRITE_ONLY = 2;
-	BUCKET_READ_WRITE = 3;
-    }
-    
-    // This field is OPTIONAL
-    // Allow uncredentialed access to bucket.
-    AnonymousBucketAccessMode anonymous_bucket_access_mode = 3;
 }
 
 message ProvisionerCreateBucketResponse {