diff --git a/waku/factory/internal_config.nim b/waku/factory/internal_config.nim
index 87be67711..c07020ca6 100644
--- a/waku/factory/internal_config.nim
+++ b/waku/factory/internal_config.nim
@@ -11,6 +11,7 @@ import
   ../common/utils/nat,
   ../node/config,
   ../waku_enr/capabilities,
+  ../waku_enr/mix,
   ../waku_enr,
   ../waku_core
 
@@ -33,6 +34,9 @@ proc enrConfiguration*(
   ).isOkOr:
     return err("could not initialize ENR with shards")
 
+  if conf.mix and conf.mixKey.isSome():
+    enrBuilder.withMixKey(conf.mixKey.get())
+
   let recordRes = enrBuilder.build()
   let record =
     if recordRes.isErr():
diff --git a/waku/waku_enr/mix.nim b/waku/waku_enr/mix.nim
new file mode 100644
index 000000000..4399d02af
--- /dev/null
+++ b/waku/waku_enr/mix.nim
@@ -0,0 +1,22 @@
+{.push raises: [].}
+
+import 
+    std/[options],
+    results,
+    libp2p/crypto/curve25519,
+    nimcrypto/utils as ncrutils
+
+import ../common/enr
+
+const MixKeyEnrField* = "mix-key"
+
+func withMixKey*(builder: var EnrBuilder, mixPrivKey:string) =
+  let mixKey = intoCurve25519Key(ncrutils.fromHex(mixPrivKey))
+  let mixPubKey = public(mixKey)
+  builder.addFieldPair(MixKeyEnrField, getBytes(mixPubKey))
+
+func mixKey*(record: TypedRecord): Option[seq[byte]] =
+  let field = record.tryGet(MixKeyEnrField, seq[byte])
+  if field.isNone():
+    return none(seq[byte])
+  return field
diff --git a/waku/waku_lightpush/client.nim b/waku/waku_lightpush/client.nim
index 9e7167dd7..c50f08641 100644
--- a/waku/waku_lightpush/client.nim
+++ b/waku/waku_lightpush/client.nim
@@ -114,15 +114,19 @@ proc publishToAny*(
 
 proc publishWithConn*(
   wl: WakuLightPushClient, pubSubTopic: PubsubTopic, message: WakuMessage, conn: Connection
-): Future[WakuLightPushResult[void]] {.async, gcsafe.} =
+): Future[WakuLightPushResult] {.async, gcsafe.} =
   ## This proc is similar to the publish one but in this case
   ## we use existing connection to publish.
 
   info "publishWithConn", msg_hash = computeMessageHash(pubsubTopic, message).to0xHex
 
-  let pushRequest = PushRequest(pubSubTopic: pubSubTopic, message: message)
-  let rpc = PushRPC(requestId: generateRequestId(wl.rng), request: some(pushRequest))
-  await conn.writeLP(rpc.encode().buffer)
+  let pushRequest = LightpushRequest(
+    requestId: generateRequestId(wl.rng),
+    pubSubTopic: some(pubSubTopic),
+    message: message,
+  )
+
+  await conn.writeLP(pushRequest.encode().buffer)
 
   for obs in wl.publishObservers:
     obs.onMessagePublished(pubSubTopic, message)