diff --git a/gen/pb-go/rekor/events/v1/sigstore_rekor_events.pb.go b/gen/pb-go/rekor/events/v1/sigstore_rekor_events.pb.go
new file mode 100644
index 00000000..f1142439
--- /dev/null
+++ b/gen/pb-go/rekor/events/v1/sigstore_rekor_events.pb.go
@@ -0,0 +1,271 @@
+// Copyright 2023 The Sigstore Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        v3.21.6
+// source: sigstore_rekor_events.proto
+
+package v1
+
+import (
+	_ "google.golang.org/genproto/googleapis/api/annotations"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// NewEntry defines the CloudEvents (https://cloudevents.io/) message that
+// is published when a new entry is added to Rekor. Adheres to the v1.0.2 schema
+// defined in https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/formats/cloudevents.json.
+type NewEntry struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The CloudEvents specification version.
+	SpecVersion string `protobuf:"bytes,1,opt,name=spec_version,json=specversion,proto3" json:"spec_version,omitempty"`
+	// The unique id of the entry in the log.
+	Id string `protobuf:"bytes,2,opt,name=id,proto3" json:"id,omitempty"`
+	// The JSON-encoded dev.sigstore.rekor.v1.TransparencyLogEntry message.
+	Data string `protobuf:"bytes,3,opt,name=data,proto3" json:"data,omitempty"`
+	// The type of the encoded data. Must be "application/json".
+	DataType string `protobuf:"bytes,4,opt,name=data_type,json=datacontenttype,proto3" json:"data_type,omitempty"`
+	// The type of the message. Must be "dev.sigstore.rekor.events.v1.NewEntry".
+	Type string `protobuf:"bytes,5,opt,name=type,proto3" json:"type,omitempty"`
+	// The source of the event.
+	Source string `protobuf:"bytes,6,opt,name=source,proto3" json:"source,omitempty"`
+	// The kind (aka type) of the entry. Must match the value in the
+	// dev.sigstore.rekor.v1.TransparencyLogEntry.KindVersion.kind field.
+	EntryKind string `protobuf:"bytes,7,opt,name=entry_kind,json=rekor_entry_kind,proto3" json:"entry_kind,omitempty"`
+	// The subject identifiers for the entities that signed the artifact
+	// uploaded to Rekor. This field may not be set if the entry_kind is not a
+	// format that supports this type of metadata.
+	Subjects []string `protobuf:"bytes,8,rep,name=subjects,json=rekor_signing_subjects,proto3" json:"subjects,omitempty"`
+	// The timestamp that the entry was added to the log. Should match the
+	// value in dev.sigstore.rekor.v1.TransparencyLogEntry.integrated_time.
+	Time *timestamppb.Timestamp `protobuf:"bytes,9,opt,name=time,proto3" json:"time,omitempty"`
+}
+
+func (x *NewEntry) Reset() {
+	*x = NewEntry{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_sigstore_rekor_events_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *NewEntry) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*NewEntry) ProtoMessage() {}
+
+func (x *NewEntry) ProtoReflect() protoreflect.Message {
+	mi := &file_sigstore_rekor_events_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use NewEntry.ProtoReflect.Descriptor instead.
+func (*NewEntry) Descriptor() ([]byte, []int) {
+	return file_sigstore_rekor_events_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *NewEntry) GetSpecVersion() string {
+	if x != nil {
+		return x.SpecVersion
+	}
+	return ""
+}
+
+func (x *NewEntry) GetId() string {
+	if x != nil {
+		return x.Id
+	}
+	return ""
+}
+
+func (x *NewEntry) GetData() string {
+	if x != nil {
+		return x.Data
+	}
+	return ""
+}
+
+func (x *NewEntry) GetDataType() string {
+	if x != nil {
+		return x.DataType
+	}
+	return ""
+}
+
+func (x *NewEntry) GetType() string {
+	if x != nil {
+		return x.Type
+	}
+	return ""
+}
+
+func (x *NewEntry) GetSource() string {
+	if x != nil {
+		return x.Source
+	}
+	return ""
+}
+
+func (x *NewEntry) GetEntryKind() string {
+	if x != nil {
+		return x.EntryKind
+	}
+	return ""
+}
+
+func (x *NewEntry) GetSubjects() []string {
+	if x != nil {
+		return x.Subjects
+	}
+	return nil
+}
+
+func (x *NewEntry) GetTime() *timestamppb.Timestamp {
+	if x != nil {
+		return x.Time
+	}
+	return nil
+}
+
+var File_sigstore_rekor_events_proto protoreflect.FileDescriptor
+
+var file_sigstore_rekor_events_proto_rawDesc = []byte{
+	0x0a, 0x1b, 0x73, 0x69, 0x67, 0x73, 0x74, 0x6f, 0x72, 0x65, 0x5f, 0x72, 0x65, 0x6b, 0x6f, 0x72,
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+	0x65, 0x63, 0x74, 0x73, 0x12, 0x2e, 0x0a, 0x04, 0x74, 0x69, 0x6d, 0x65, 0x18, 0x09, 0x20, 0x01,
+	0x28, 0x0b, 0x32, 0x1a, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x62, 0x75, 0x66, 0x2e, 0x54, 0x69, 0x6d, 0x65, 0x73, 0x74, 0x61, 0x6d, 0x70, 0x52, 0x04,
+	0x74, 0x69, 0x6d, 0x65, 0x42, 0x76, 0x0a, 0x22, 0x64, 0x65, 0x76, 0x2e, 0x73, 0x69, 0x67, 0x73,
+	0x74, 0x6f, 0x72, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2e, 0x72, 0x65, 0x6b, 0x6f, 0x72,
+	0x2e, 0x65, 0x76, 0x65, 0x6e, 0x74, 0x73, 0x2e, 0x76, 0x31, 0x42, 0x10, 0x52, 0x65, 0x6b, 0x6f,
+	0x72, 0x45, 0x76, 0x65, 0x6e, 0x74, 0x73, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50, 0x01, 0x5a, 0x3c,
+	0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x73, 0x69, 0x67, 0x73, 0x74,
+	0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2d, 0x73, 0x70, 0x65,
+	0x63, 0x73, 0x2f, 0x67, 0x65, 0x6e, 0x2f, 0x70, 0x62, 0x2d, 0x67, 0x6f, 0x2f, 0x72, 0x65, 0x6b,
+	0x6f, 0x72, 0x2f, 0x65, 0x76, 0x65, 0x6e, 0x74, 0x73, 0x2f, 0x76, 0x31, 0x62, 0x06, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_sigstore_rekor_events_proto_rawDescOnce sync.Once
+	file_sigstore_rekor_events_proto_rawDescData = file_sigstore_rekor_events_proto_rawDesc
+)
+
+func file_sigstore_rekor_events_proto_rawDescGZIP() []byte {
+	file_sigstore_rekor_events_proto_rawDescOnce.Do(func() {
+		file_sigstore_rekor_events_proto_rawDescData = protoimpl.X.CompressGZIP(file_sigstore_rekor_events_proto_rawDescData)
+	})
+	return file_sigstore_rekor_events_proto_rawDescData
+}
+
+var file_sigstore_rekor_events_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_sigstore_rekor_events_proto_goTypes = []interface{}{
+	(*NewEntry)(nil),              // 0: dev.sigstore.rekor.events.v1.NewEntry
+	(*timestamppb.Timestamp)(nil), // 1: google.protobuf.Timestamp
+}
+var file_sigstore_rekor_events_proto_depIdxs = []int32{
+	1, // 0: dev.sigstore.rekor.events.v1.NewEntry.time:type_name -> google.protobuf.Timestamp
+	1, // [1:1] is the sub-list for method output_type
+	1, // [1:1] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_sigstore_rekor_events_proto_init() }
+func file_sigstore_rekor_events_proto_init() {
+	if File_sigstore_rekor_events_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_sigstore_rekor_events_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*NewEntry); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_sigstore_rekor_events_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_sigstore_rekor_events_proto_goTypes,
+		DependencyIndexes: file_sigstore_rekor_events_proto_depIdxs,
+		MessageInfos:      file_sigstore_rekor_events_proto_msgTypes,
+	}.Build()
+	File_sigstore_rekor_events_proto = out.File
+	file_sigstore_rekor_events_proto_rawDesc = nil
+	file_sigstore_rekor_events_proto_goTypes = nil
+	file_sigstore_rekor_events_proto_depIdxs = nil
+}
diff --git a/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/rekor/events/__init__.py b/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/rekor/events/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/rekor/events/v1/__init__.py b/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/rekor/events/v1/__init__.py
new file mode 100644
index 00000000..d892bb37
--- /dev/null
+++ b/gen/pb-python/sigstore_protobuf_specs/dev/sigstore/rekor/events/v1/__init__.py
@@ -0,0 +1,57 @@
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# sources: sigstore_rekor_events.proto
+# plugin: python-betterproto
+from dataclasses import dataclass
+from datetime import datetime
+from typing import List
+
+import betterproto
+
+
+@dataclass(eq=False, repr=False)
+class NewEntry(betterproto.Message):
+    """
+    NewEntry defines the CloudEvents (https://cloudevents.io/) message that is
+    published when a new entry is added to Rekor. Adheres to the v1.0.2 schema
+    defined in https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/form
+    ats/cloudevents.json.
+    """
+
+    spec_version: str = betterproto.string_field(1)
+    """The CloudEvents specification version."""
+
+    id: str = betterproto.string_field(2)
+    """The unique id of the entry in the log."""
+
+    data: str = betterproto.string_field(3)
+    """The JSON-encoded dev.sigstore.rekor.v1.TransparencyLogEntry message."""
+
+    data_type: str = betterproto.string_field(4)
+    """The type of the encoded data. Must be "application/json"."""
+
+    type: str = betterproto.string_field(5)
+    """
+    The type of the message. Must be "dev.sigstore.rekor.events.v1.NewEntry".
+    """
+
+    source: str = betterproto.string_field(6)
+    """The source of the event."""
+
+    entry_kind: str = betterproto.string_field(7)
+    """
+    The kind (aka type) of the entry. Must match the value in the
+    dev.sigstore.rekor.v1.TransparencyLogEntry.KindVersion.kind field.
+    """
+
+    subjects: List[str] = betterproto.string_field(8)
+    """
+    The subject identifiers for the entities that signed the artifact uploaded
+    to Rekor. This field may not be set if the entry_kind is not a format that
+    supports this type of metadata.
+    """
+
+    time: datetime = betterproto.message_field(9)
+    """
+    The timestamp that the entry was added to the log. Should match the value
+    in dev.sigstore.rekor.v1.TransparencyLogEntry.integrated_time.
+    """
diff --git a/gen/pb-ruby/lib/sigstore_rekor_events_pb.rb b/gen/pb-ruby/lib/sigstore_rekor_events_pb.rb
new file mode 100644
index 00000000..cde035c7
--- /dev/null
+++ b/gen/pb-ruby/lib/sigstore_rekor_events_pb.rb
@@ -0,0 +1,35 @@
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: sigstore_rekor_events.proto
+
+require 'google/protobuf'
+
+require 'google/api/field_behavior_pb'
+require 'google/protobuf/timestamp_pb'
+
+Google::Protobuf::DescriptorPool.generated_pool.build do
+  add_file("sigstore_rekor_events.proto", :syntax => :proto3) do
+    add_message "dev.sigstore.rekor.events.v1.NewEntry" do
+      optional :spec_version, :string, 1, json_name: "specversion"
+      optional :id, :string, 2
+      optional :data, :string, 3
+      optional :data_type, :string, 4, json_name: "datacontenttype"
+      optional :type, :string, 5
+      optional :source, :string, 6
+      optional :entry_kind, :string, 7, json_name: "rekor_entry_kind"
+      repeated :subjects, :string, 8, json_name: "rekor_signing_subjects"
+      optional :time, :message, 9, "google.protobuf.Timestamp"
+    end
+  end
+end
+
+module Dev
+  module Sigstore
+    module Rekor
+      module Events
+        module V1
+          NewEntry = ::Google::Protobuf::DescriptorPool.generated_pool.lookup("dev.sigstore.rekor.events.v1.NewEntry").msgclass
+        end
+      end
+    end
+  end
+end
diff --git a/gen/pb-typescript/src/__generated__/sigstore_rekor_events.ts b/gen/pb-typescript/src/__generated__/sigstore_rekor_events.ts
new file mode 100644
index 00000000..f13b1ceb
--- /dev/null
+++ b/gen/pb-typescript/src/__generated__/sigstore_rekor_events.ts
@@ -0,0 +1,108 @@
+/* eslint-disable */
+import { Timestamp } from "./google/protobuf/timestamp";
+
+/**
+ * NewEntry defines the CloudEvents (https://cloudevents.io/) message that
+ * is published when a new entry is added to Rekor. Adheres to the v1.0.2 schema
+ * defined in https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/formats/cloudevents.json.
+ */
+export interface NewEntry {
+  /** The CloudEvents specification version. */
+  specVersion: string;
+  /** The unique id of the entry in the log. */
+  id: string;
+  /** The JSON-encoded dev.sigstore.rekor.v1.TransparencyLogEntry message. */
+  data: string;
+  /** The type of the encoded data. Must be "application/json". */
+  dataType: string;
+  /** The type of the message. Must be "dev.sigstore.rekor.events.v1.NewEntry". */
+  type: string;
+  /** The source of the event. */
+  source: string;
+  /**
+   * The kind (aka type) of the entry. Must match the value in the
+   * dev.sigstore.rekor.v1.TransparencyLogEntry.KindVersion.kind field.
+   */
+  entryKind: string;
+  /**
+   * The subject identifiers for the entities that signed the artifact
+   * uploaded to Rekor. This field may not be set if the entry_kind is not a
+   * format that supports this type of metadata.
+   */
+  subjects: string[];
+  /**
+   * The timestamp that the entry was added to the log. Should match the
+   * value in dev.sigstore.rekor.v1.TransparencyLogEntry.integrated_time.
+   */
+  time: Date | undefined;
+}
+
+function createBaseNewEntry(): NewEntry {
+  return {
+    specVersion: "",
+    id: "",
+    data: "",
+    dataType: "",
+    type: "",
+    source: "",
+    entryKind: "",
+    subjects: [],
+    time: undefined,
+  };
+}
+
+export const NewEntry = {
+  fromJSON(object: any): NewEntry {
+    return {
+      specVersion: isSet(object.specversion) ? String(object.specversion) : "",
+      id: isSet(object.id) ? String(object.id) : "",
+      data: isSet(object.data) ? String(object.data) : "",
+      dataType: isSet(object.datacontenttype) ? String(object.datacontenttype) : "",
+      type: isSet(object.type) ? String(object.type) : "",
+      source: isSet(object.source) ? String(object.source) : "",
+      entryKind: isSet(object.rekor_entry_kind) ? String(object.rekor_entry_kind) : "",
+      subjects: Array.isArray(object?.rekor_signing_subjects)
+        ? object.rekor_signing_subjects.map((e: any) => String(e))
+        : [],
+      time: isSet(object.time) ? fromJsonTimestamp(object.time) : undefined,
+    };
+  },
+
+  toJSON(message: NewEntry): unknown {
+    const obj: any = {};
+    message.specVersion !== undefined && (obj.specversion = message.specVersion);
+    message.id !== undefined && (obj.id = message.id);
+    message.data !== undefined && (obj.data = message.data);
+    message.dataType !== undefined && (obj.datacontenttype = message.dataType);
+    message.type !== undefined && (obj.type = message.type);
+    message.source !== undefined && (obj.source = message.source);
+    message.entryKind !== undefined && (obj.rekor_entry_kind = message.entryKind);
+    if (message.subjects) {
+      obj.rekor_signing_subjects = message.subjects.map((e) => e);
+    } else {
+      obj.rekor_signing_subjects = [];
+    }
+    message.time !== undefined && (obj.time = message.time.toISOString());
+    return obj;
+  },
+};
+
+function fromTimestamp(t: Timestamp): Date {
+  let millis = Number(t.seconds) * 1_000;
+  millis += t.nanos / 1_000_000;
+  return new Date(millis);
+}
+
+function fromJsonTimestamp(o: any): Date {
+  if (o instanceof Date) {
+    return o;
+  } else if (typeof o === "string") {
+    return new Date(o);
+  } else {
+    return fromTimestamp(Timestamp.fromJSON(o));
+  }
+}
+
+function isSet(value: any): boolean {
+  return value !== null && value !== undefined;
+}
diff --git a/protos/sigstore_rekor_events.proto b/protos/sigstore_rekor_events.proto
new file mode 100644
index 00000000..4585a40d
--- /dev/null
+++ b/protos/sigstore_rekor_events.proto
@@ -0,0 +1,69 @@
+// Copyright 2023 The Sigstore Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+package dev.sigstore.rekor.events.v1;
+
+import "google/api/field_behavior.proto";
+import "google/protobuf/timestamp.proto";
+
+option go_package = "github.com/sigstore/protobuf-specs/gen/pb-go/rekor/events/v1";
+option java_package = "dev.sigstore.proto.rekor.events.v1";
+option java_multiple_files = true;
+option java_outer_classname = "RekorEventsProto";
+
+// NewEntry defines the CloudEvents (https://cloudevents.io/) message that
+// is published when a new entry is added to Rekor. Adheres to the v1.0.2 schema
+// defined in https://github.com/cloudevents/spec/blob/v1.0.2/cloudevents/formats/cloudevents.json.
+message NewEntry {
+    // The CloudEvents specification version.
+    string spec_version = 1 [
+        json_name="specversion",
+        (google.api.field_behavior)=REQUIRED
+    ];
+
+    // The unique id of the entry in the log.
+    string id = 2 [(google.api.field_behavior)=REQUIRED];
+
+    // The JSON-encoded dev.sigstore.rekor.v1.TransparencyLogEntry message.
+    string data = 3 [(google.api.field_behavior)=REQUIRED];
+
+    // The type of the encoded data. Must be "application/json".
+    string data_type = 4 [
+        json_name="datacontenttype",
+        (google.api.field_behavior)=REQUIRED
+    ];
+    
+    // The type of the message. Must be "dev.sigstore.rekor.events.v1.NewEntry".
+    string type = 5 [(google.api.field_behavior)=REQUIRED];
+
+    // The source of the event.
+    string source = 6 [(google.api.field_behavior)=REQUIRED];
+
+    // The kind (aka type) of the entry. Must match the value in the
+    // dev.sigstore.rekor.v1.TransparencyLogEntry.KindVersion.kind field.
+    string entry_kind = 7 [
+        json_name="rekor_entry_kind",
+        (google.api.field_behavior)=REQUIRED
+    ];
+
+    // The subject identifiers for the entities that signed the artifact
+    // uploaded to Rekor. This field may not be set if the entry_kind is not a
+    // format that supports this type of metadata.
+    repeated string subjects = 8 [json_name="rekor_signing_subjects"];
+
+    // The timestamp that the entry was added to the log. Should match the
+    // value in dev.sigstore.rekor.v1.TransparencyLogEntry.integrated_time.
+    .google.protobuf.Timestamp time = 9;
+}