diff --git a/package-lock.json b/package-lock.json
index 649e2211fe..1330a4bcb7 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -42806,6 +42806,7 @@
       "version": "0.0.2",
       "license": "MIT OR Apache-2.0",
       "dependencies": {
+        "@libp2p/interface": "2.7.0",
         "@noble/hashes": "^1.7.1",
         "@waku/message-hash": "^0.1.18",
         "@waku/proto": "^0.0.9",
diff --git a/packages/proto/src/generated/sds_message.ts b/packages/proto/src/generated/sds_message.ts
index 757756b6f9..8ad2dbef6c 100644
--- a/packages/proto/src/generated/sds_message.ts
+++ b/packages/proto/src/generated/sds_message.ts
@@ -7,11 +7,81 @@
 import { type Codec, decodeMessage, type DecodeOptions, encodeMessage, MaxLengthError, message } from 'protons-runtime'
 import type { Uint8ArrayList } from 'uint8arraylist'
 
+export interface HistoryEntry {
+  messageId: string
+  retrievalHint?: Uint8Array
+}
+
+export namespace HistoryEntry {
+  let _codec: Codec<HistoryEntry>
+
+  export const codec = (): Codec<HistoryEntry> => {
+    if (_codec == null) {
+      _codec = message<HistoryEntry>((obj, w, opts = {}) => {
+        if (opts.lengthDelimited !== false) {
+          w.fork()
+        }
+
+        if ((obj.messageId != null && obj.messageId !== '')) {
+          w.uint32(10)
+          w.string(obj.messageId)
+        }
+
+        if (obj.retrievalHint != null) {
+          w.uint32(18)
+          w.bytes(obj.retrievalHint)
+        }
+
+        if (opts.lengthDelimited !== false) {
+          w.ldelim()
+        }
+      }, (reader, length, opts = {}) => {
+        const obj: any = {
+          messageId: ''
+        }
+
+        const end = length == null ? reader.len : reader.pos + length
+
+        while (reader.pos < end) {
+          const tag = reader.uint32()
+
+          switch (tag >>> 3) {
+            case 1: {
+              obj.messageId = reader.string()
+              break
+            }
+            case 2: {
+              obj.retrievalHint = reader.bytes()
+              break
+            }
+            default: {
+              reader.skipType(tag & 7)
+              break
+            }
+          }
+        }
+
+        return obj
+      })
+    }
+
+    return _codec
+  }
+
+  export const encode = (obj: Partial<HistoryEntry>): Uint8Array => {
+    return encodeMessage(obj, HistoryEntry.codec())
+  }
+
+  export const decode = (buf: Uint8Array | Uint8ArrayList, opts?: DecodeOptions<HistoryEntry>): HistoryEntry => {
+    return decodeMessage(buf, HistoryEntry.codec(), opts)
+  }
+}
+
 export interface SdsMessage {
   messageId: string
   channelId: string
   lamportTimestamp?: number
-  causalHistory: string[]
+  causalHistory: HistoryEntry[]
   bloomFilter?: Uint8Array
   content?: Uint8Array
 }
@@ -44,7 +114,7 @@ export namespace SdsMessage {
         if (obj.causalHistory != null) {
           for (const value of obj.causalHistory) {
             w.uint32(90)
-            w.string(value)
+            HistoryEntry.codec().encode(value, w)
           }
         }
 
@@ -91,7 +161,9 @@ export namespace SdsMessage {
                 throw new MaxLengthError('Decode error - map field "causalHistory" had too many elements')
               }
 
-              obj.causalHistory.push(reader.string())
+              obj.causalHistory.push(HistoryEntry.codec().decode(reader, reader.uint32(), {
+                limits: opts.limits?.causalHistory$
+              }))
               break
             }
             case 12: {
diff --git a/packages/proto/src/lib/sds_message.proto b/packages/proto/src/lib/sds_message.proto
index f0396e6cc8..c75c8d7447 100644
--- a/packages/proto/src/lib/sds_message.proto
+++ b/packages/proto/src/lib/sds_message.proto
@@ -1,11 +1,16 @@
 syntax = "proto3";
 
+message HistoryEntry {
+  string message_id = 1; // Unique identifier of the SDS message, as defined in `Message`
+  optional bytes retrieval_hint = 2; // Optional information to help remote parties retrieve this SDS message; For example, A Waku deterministic message hash or routing payload hash
+}
+
 message SdsMessage {
   // 1 Reserved for sender/participant id
   string message_id = 2;          // Unique identifier of the message
   string channel_id = 3;          // Identifier of the channel to which the message belongs
   optional int32 lamport_timestamp = 10;    // Logical timestamp for causal ordering in channel
-  repeated string causal_history = 11;  // List of preceding message IDs that this message causally depends on. Generally 2 or 3 message IDs are included.
+  repeated HistoryEntry causal_history = 11;  // List of preceding message IDs that this message causally depends on. Generally 2 or 3 message IDs are included.
   optional bytes bloom_filter = 12;         // Bloom filter representing received message IDs in channel
   optional bytes content = 20;             // Actual content of the message
 }
\ No newline at end of file
diff --git a/packages/sds/package.json b/packages/sds/package.json
index a5e74c631c..545ecca746 100644
--- a/packages/sds/package.json
+++ b/packages/sds/package.json
@@ -59,7 +59,7 @@
         "node": ">=20"
     },
     "dependencies": {
-        "@libp2p/interface": "^2.7.0",
+        "@libp2p/interface": "2.7.0",
         "@noble/hashes": "^1.7.1",
         "@waku/message-hash": "^0.1.18",
         "@waku/proto": "^0.0.9",
diff --git a/packages/sds/src/sds.spec.ts b/packages/sds/src/sds.spec.ts
index b70bb6edac..64ced83926 100644
--- a/packages/sds/src/sds.spec.ts
+++ b/packages/sds/src/sds.spec.ts
@@ -4,14 +4,15 @@ import { expect } from "chai";
 import { DefaultBloomFilter } from "./bloom.js";
 import {
   DEFAULT_BLOOM_FILTER_OPTIONS,
+  HistoryEntry,
   Message,
   MessageChannel,
   MessageChannelEvent
 } from "./sds.js";
 
 const channelId = "test-channel";
-const callback = (_message: Message): Promise<boolean> => {
-  return Promise.resolve(true);
+const callback = (_message: Message): Promise<{ success: boolean }> => {
+  return Promise.resolve({ success: true });
 };
 
 const getBloomFilter = (channel: MessageChannel): DefaultBloomFilter => {
@@ -62,15 +63,16 @@ describe("MessageChannel", function () {
       const expectedTimestamp = (channelA as any).lamportTimestamp + 1;
       const messageId = MessageChannel.getMessageId(new Uint8Array());
       await channelA.sendMessage(new Uint8Array(), callback);
-      const messageIdLog = (channelA as any).messageIdLog as {
+      const messageIdLog = (channelA as any).localHistory as {
         timestamp: number;
-        messageId: string;
+        historyEntry: HistoryEntry;
       }[];
       expect(messageIdLog.length).to.equal(1);
       expect(
         messageIdLog.some(
           (log) =>
-            log.timestamp === expectedTimestamp && log.messageId === messageId
+            log.timestamp === expectedTimestamp &&
+            log.historyEntry.messageId === messageId
         )
       ).to.equal(true);
     });
@@ -100,12 +102,15 @@ describe("MessageChannel", function () {
 
       // Causal history should only contain the last N messages as defined by causalHistorySize
       const causalHistory = outgoingBuffer[outgoingBuffer.length - 1]
-        .causalHistory as string[];
+        .causalHistory as HistoryEntry[];
       expect(causalHistory.length).to.equal(causalHistorySize);
 
       const expectedCausalHistory = messages
         .slice(-causalHistorySize - 1, -1)
-        .map((message) => MessageChannel.getMessageId(utf8ToBytes(message)));
+        .map((message) => ({
+          messageId: MessageChannel.getMessageId(utf8ToBytes(message)),
+          retrievalHint: undefined
+        }));
       expect(causalHistory).to.deep.equal(expectedCausalHistory);
     });
   });
@@ -120,7 +125,7 @@ describe("MessageChannel", function () {
       const timestampBefore = (channelA as any).lamportTimestamp;
       await channelB.sendMessage(new Uint8Array(), (message) => {
         channelA.receiveMessage(message);
-        return Promise.resolve(true);
+        return Promise.resolve({ success: true });
       });
       const timestampAfter = (channelA as any).lamportTimestamp;
       expect(timestampAfter).to.equal(timestampBefore + 1);
@@ -133,7 +138,7 @@ describe("MessageChannel", function () {
       for (const m of messagesB) {
         await channelB.sendMessage(utf8ToBytes(m), (message) => {
           channelA.receiveMessage(message);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         });
       }
       const timestampAfter = (channelA as any).lamportTimestamp;
@@ -147,7 +152,7 @@ describe("MessageChannel", function () {
           timestamp++;
           channelB.receiveMessage(message);
           expect((channelB as any).lamportTimestamp).to.equal(timestamp);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         });
       }
 
@@ -156,7 +161,7 @@ describe("MessageChannel", function () {
           timestamp++;
           channelA.receiveMessage(message);
           expect((channelA as any).lamportTimestamp).to.equal(timestamp);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         });
       }
 
@@ -173,7 +178,7 @@ describe("MessageChannel", function () {
           channelB.receiveMessage(message);
           const bloomFilter = getBloomFilter(channelB);
           expect(bloomFilter.lookup(message.messageId)).to.equal(true);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         });
       }
     });
@@ -189,7 +194,7 @@ describe("MessageChannel", function () {
       await channelA.sendMessage(utf8ToBytes(messagesB[0]), (message) => {
         receivedMessage = message;
         channelB.receiveMessage(message);
-        return Promise.resolve(true);
+        return Promise.resolve({ success: true });
       });
 
       const incomingBuffer = (channelB as any).incomingBuffer as Message[];
@@ -201,12 +206,15 @@ describe("MessageChannel", function () {
       expect(timestampAfter).to.equal(timestampBefore);
 
       // Message should not be in local history
-      const localHistory = (channelB as any).messageIdLog as {
+      const localHistory = (channelB as any).localHistory as {
         timestamp: number;
-        messageId: string;
+        historyEntry: HistoryEntry;
       }[];
       expect(
-        localHistory.some((m) => m.messageId === receivedMessage!.messageId)
+        localHistory.some(
+          ({ historyEntry: { messageId } }) =>
+            messageId === receivedMessage!.messageId
+        )
       ).to.equal(false);
     });
   });
@@ -221,14 +229,14 @@ describe("MessageChannel", function () {
       for (const m of messagesA) {
         await channelA.sendMessage(utf8ToBytes(m), (message) => {
           channelB.receiveMessage(message);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         });
       }
 
       let notInHistory: Message | null = null;
       await channelA.sendMessage(utf8ToBytes("not-in-history"), (message) => {
         notInHistory = message;
-        return Promise.resolve(true);
+        return Promise.resolve({ success: true });
       });
 
       expect((channelA as any).outgoingBuffer.length).to.equal(
@@ -237,7 +245,7 @@ describe("MessageChannel", function () {
 
       await channelB.sendMessage(utf8ToBytes(messagesB[0]), (message) => {
         channelA.receiveMessage(message);
-        return Promise.resolve(true);
+        return Promise.resolve({ success: true });
       });
 
       // Since messagesA are in causal history of channel B's message
@@ -262,7 +270,7 @@ describe("MessageChannel", function () {
       for (const m of messages) {
         await channelA.sendMessage(utf8ToBytes(m), (message) => {
           channelB.receiveMessage(message);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         });
       }
 
@@ -276,7 +284,7 @@ describe("MessageChannel", function () {
         utf8ToBytes(messagesB[messagesB.length - 1]),
         (message) => {
           channelA.receiveMessage(message);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         }
       );
 
@@ -310,7 +318,7 @@ describe("MessageChannel", function () {
         // Send messages until acknowledgement count is reached
         await channelB.sendMessage(utf8ToBytes(`x-${i}`), (message) => {
           channelA.receiveMessage(message);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         });
       }
 
@@ -344,9 +352,9 @@ describe("MessageChannel", function () {
         await channelA.sendMessage(utf8ToBytes(m), callback);
       }
 
-      await channelA.sendMessage(utf8ToBytes(messagesB[0]), (message) => {
+      await channelA.sendMessage(utf8ToBytes(messagesB[0]), async (message) => {
         channelB.receiveMessage(message);
-        return Promise.resolve(true);
+        return Promise.resolve({ success: true });
       });
 
       const incomingBuffer = (channelB as any).incomingBuffer as Message[];
@@ -357,7 +365,7 @@ describe("MessageChannel", function () {
 
       const missingMessages = channelB.sweepIncomingBuffer();
       expect(missingMessages.length).to.equal(causalHistorySize);
-      expect(missingMessages[0]).to.equal(
+      expect(missingMessages[0].messageId).to.equal(
         MessageChannel.getMessageId(utf8ToBytes(messagesA[0]))
       );
     });
@@ -368,18 +376,18 @@ describe("MessageChannel", function () {
       for (const m of messagesA) {
         await channelA.sendMessage(utf8ToBytes(m), (message) => {
           sentMessages.push(message);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         });
       }
 
       await channelA.sendMessage(utf8ToBytes(messagesB[0]), (message) => {
         channelB.receiveMessage(message);
-        return Promise.resolve(true);
+        return Promise.resolve({ success: true });
       });
 
       const missingMessages = channelB.sweepIncomingBuffer();
       expect(missingMessages.length).to.equal(causalHistorySize);
-      expect(missingMessages[0]).to.equal(
+      expect(missingMessages[0].messageId).to.equal(
         MessageChannel.getMessageId(utf8ToBytes(messagesA[0]))
       );
 
@@ -411,7 +419,7 @@ describe("MessageChannel", function () {
 
       await channelA.sendMessage(utf8ToBytes(messagesB[0]), (message) => {
         channelC.receiveMessage(message);
-        return Promise.resolve(true);
+        return Promise.resolve({ success: true });
       });
 
       const missingMessages = channelC.sweepIncomingBuffer();
@@ -439,7 +447,7 @@ describe("MessageChannel", function () {
         await channelA.sendMessage(utf8ToBytes(m), (message) => {
           unacknowledgedMessages.push(message);
           channelB.receiveMessage(message);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         });
       }
 
@@ -458,7 +466,7 @@ describe("MessageChannel", function () {
         utf8ToBytes(messagesB[causalHistorySize]),
         (message) => {
           channelA.receiveMessage(message);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         }
       );
 
@@ -495,7 +503,7 @@ describe("MessageChannel", function () {
         bloomFilter.lookup(MessageChannel.getMessageId(new Uint8Array()))
       ).to.equal(false);
 
-      const localLog = (channelA as any).messageIdLog as {
+      const localLog = (channelA as any).localHistory as {
         timestamp: number;
         messageId: string;
       }[];
@@ -514,7 +522,7 @@ describe("MessageChannel", function () {
       expect(timestampAfter).to.equal(expectedTimestamp);
       expect(timestampAfter).to.be.greaterThan(timestampBefore);
 
-      const localLog = (channelB as any).messageIdLog as {
+      const localLog = (channelB as any).localHistory as {
         timestamp: number;
         messageId: string;
       }[];
@@ -530,7 +538,7 @@ describe("MessageChannel", function () {
       for (const m of messagesA) {
         await channelA.sendMessage(utf8ToBytes(m), (message) => {
           channelB.receiveMessage(message);
-          return Promise.resolve(true);
+          return Promise.resolve({ success: true });
         });
       }
 
diff --git a/packages/sds/src/sds.ts b/packages/sds/src/sds.ts
index c316f88ff4..ea3c26a814 100644
--- a/packages/sds/src/sds.ts
+++ b/packages/sds/src/sds.ts
@@ -13,6 +13,7 @@ type MessageChannelEvents = {
 };
 
 export type Message = proto_sds_message.SdsMessage;
+export type HistoryEntry = proto_sds_message.HistoryEntry;
 export type ChannelId = string;
 
 export const DEFAULT_BLOOM_FILTER_OPTIONS = {
@@ -36,7 +37,7 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
   private outgoingBuffer: Message[];
   private acknowledgements: Map<string, number>;
   private incomingBuffer: Message[];
-  private messageIdLog: { timestamp: number; messageId: string }[];
+  private localHistory: { timestamp: number; historyEntry: HistoryEntry }[];
   private channelId: ChannelId;
   private causalHistorySize: number;
   private acknowledgementCount: number;
@@ -56,7 +57,7 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
     this.outgoingBuffer = [];
     this.acknowledgements = new Map();
     this.incomingBuffer = [];
-    this.messageIdLog = [];
+    this.localHistory = [];
     this.causalHistorySize =
       options.causalHistorySize ?? DEFAULT_CAUSAL_HISTORY_SIZE;
     this.acknowledgementCount = this.getAcknowledgementCount();
@@ -90,7 +91,10 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
    */
   public async sendMessage(
     payload: Uint8Array,
-    callback?: (message: Message) => Promise<boolean>
+    callback?: (message: Message) => Promise<{
+      success: boolean;
+      retrievalHint?: Uint8Array;
+    }>
   ): Promise<void> {
     this.lamportTimestamp++;
 
@@ -100,9 +104,9 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
       messageId,
       channelId: this.channelId,
       lamportTimestamp: this.lamportTimestamp,
-      causalHistory: this.messageIdLog
+      causalHistory: this.localHistory
         .slice(-this.causalHistorySize)
-        .map(({ messageId }) => messageId),
+        .map(({ historyEntry }) => historyEntry),
       bloomFilter: this.filter.toBytes(),
       content: payload
     };
@@ -110,10 +114,16 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
     this.outgoingBuffer.push(message);
 
     if (callback) {
-      const success = await callback(message);
+      const { success, retrievalHint } = await callback(message);
       if (success) {
         this.filter.insert(messageId);
-        this.messageIdLog.push({ timestamp: this.lamportTimestamp, messageId });
+        this.localHistory.push({
+          timestamp: this.lamportTimestamp,
+          historyEntry: {
+            messageId,
+            retrievalHint
+          }
+        });
       }
     }
   }
@@ -175,9 +185,10 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
       this.filter.insert(message.messageId);
     }
     // verify causal history
-    const dependenciesMet = message.causalHistory.every((messageId) =>
-      this.messageIdLog.some(
-        ({ messageId: logMessageId }) => logMessageId === messageId
+    const dependenciesMet = message.causalHistory.every((historyEntry) =>
+      this.localHistory.some(
+        ({ historyEntry: { messageId } }) =>
+          messageId === historyEntry.messageId
       )
     );
     if (!dependenciesMet) {
@@ -189,17 +200,18 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
   }
 
   // https://rfc.vac.dev/vac/raw/sds/#periodic-incoming-buffer-sweep
-  public sweepIncomingBuffer(): string[] {
+  public sweepIncomingBuffer(): HistoryEntry[] {
     const { buffer, missing } = this.incomingBuffer.reduce<{
       buffer: Message[];
-      missing: string[];
+      missing: HistoryEntry[];
     }>(
       ({ buffer, missing }, message) => {
         // Check each message for missing dependencies
         const missingDependencies = message.causalHistory.filter(
-          (messageId) =>
-            !this.messageIdLog.some(
-              ({ messageId: logMessageId }) => logMessageId === messageId
+          (messageHistoryEntry) =>
+            !this.localHistory.some(
+              ({ historyEntry: { messageId } }) =>
+                messageId === messageHistoryEntry.messageId
             )
         );
         if (missingDependencies.length === 0) {
@@ -227,7 +239,7 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
           missing: missing.concat(missingDependencies)
         };
       },
-      { buffer: new Array<Message>(), missing: new Array<string>() }
+      { buffer: new Array<Message>(), missing: new Array<HistoryEntry>() }
     );
     // Update the incoming buffer to only include messages with no missing dependencies
     this.incomingBuffer = buffer;
@@ -284,9 +296,9 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
       messageId: MessageChannel.getMessageId(emptyMessage),
       channelId: this.channelId,
       lamportTimestamp: this.lamportTimestamp,
-      causalHistory: this.messageIdLog
+      causalHistory: this.localHistory
         .slice(-this.causalHistorySize)
-        .map(({ messageId }) => messageId),
+        .map(({ historyEntry }) => historyEntry),
       bloomFilter: this.filter.toBytes(),
       content: emptyMessage
     };
@@ -298,7 +310,7 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
   }
 
   // See https://rfc.vac.dev/vac/raw/sds/#deliver-message
-  private deliverMessage(message: Message): void {
+  private deliverMessage(message: Message, retrievalHint?: Uint8Array): void {
     this.notifyDeliveredMessage(message.messageId);
 
     const messageLamportTimestamp = message.lamportTimestamp ?? 0;
@@ -321,15 +333,18 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
     // If one or more message IDs with the same Lamport timestamp already exists,
     // the participant MUST follow the Resolve Conflicts procedure.
     // https://rfc.vac.dev/vac/raw/sds/#resolve-conflicts
-    this.messageIdLog.push({
+    this.localHistory.push({
       timestamp: messageLamportTimestamp,
-      messageId: message.messageId
+      historyEntry: {
+        messageId: message.messageId,
+        retrievalHint
+      }
     });
-    this.messageIdLog.sort((a, b) => {
+    this.localHistory.sort((a, b) => {
       if (a.timestamp !== b.timestamp) {
         return a.timestamp - b.timestamp;
       }
-      return a.messageId.localeCompare(b.messageId);
+      return a.historyEntry.messageId.localeCompare(b.historyEntry.messageId);
     });
   }
 
@@ -338,9 +353,9 @@ export class MessageChannel extends TypedEventEmitter<MessageChannelEvents> {
   // See https://rfc.vac.dev/vac/raw/sds/#review-ack-status
   private reviewAckStatus(receivedMessage: Message): void {
     // the participant MUST mark all messages in the received causal_history as acknowledged.
-    receivedMessage.causalHistory.forEach((messageId) => {
+    receivedMessage.causalHistory.forEach(({ messageId }) => {
       this.outgoingBuffer = this.outgoingBuffer.filter(
-        (msg) => msg.messageId !== messageId
+        ({ messageId: outgoingMessageId }) => outgoingMessageId !== messageId
       );
       this.acknowledgements.delete(messageId);
       if (!this.filter.lookup(messageId)) {