diff --git a/core/conversations/src/conversation.rs b/core/conversations/src/conversation.rs
index c184fbe..ba148db 100644
--- a/core/conversations/src/conversation.rs
+++ b/core/conversations/src/conversation.rs
@@ -1,4 +1,5 @@
 pub mod group_v1;
+mod group_v2;
 mod privatev1;
 
 pub use crate::errors::ChatError;
@@ -6,6 +7,7 @@ use crate::outcomes::ConvoOutcome;
 use crate::proto::EncryptedPayload;
 use crate::service_context::{ExternalServices, ServiceContext};
 pub use group_v1::GroupV1Convo;
+pub use group_v2::GroupV2Convo;
 pub use privatev1::PrivateV1Convo;
 use shared_traits::IdentIdRef;
 
diff --git a/core/conversations/src/conversation/group_v2.rs b/core/conversations/src/conversation/group_v2.rs
new file mode 100644
index 0000000..9b4d19a
--- /dev/null
+++ b/core/conversations/src/conversation/group_v2.rs
@@ -0,0 +1,486 @@
+// This Implementation is a Quick and Dirty Integration of DeMLS into libchat.
+// DeMLS and Libchat have different execution models, trait definitions and ownership/lifetimes of objects.
+// The easies path is to do a Spike to see what it would take, gather the friction points and then iterate.
+
+use crate::types::AddressedEncryptedPayload;
+use crate::{Content, WakeupService};
+use alloy::signers::local::PrivateKeySigner;
+use blake2::{Blake2b, Digest, digest::consts::U6};
+use chat_proto::logoschat::encryption::{EncryptedPayload, Plaintext, encrypted_payload};
+use de_mls::core::{
+    ConsensusPlugin, ConsensusServiceFor, ConversationEvent, ConversationPluginsFactory,
+    ScoringConfig, StewardListConfig,
+};
+use de_mls::defaults::{
+    DefaultConsensusPlugin, DefaultConversationPluginsFactory, MemoryDeMlsStorage,
+};
+use de_mls::member_id::MemberId;
+use de_mls::mls_crypto::MlsCredentials;
+use de_mls::protos::de_mls::messages::v1::{
+    AppMessage as AppMessageProto, MemberWelcome, app_message,
+};
+use de_mls::session::{Conversation, ConversationConfig, ConversationDeps};
+use hashgraph_like_consensus::signing::EthereumConsensusSigner;
+use prost::Message;
+use rand;
+use shared_traits::{IdentId, IdentIdRef};
+use std::sync::Arc;
+use std::time::Duration;
+use tracing::{info, instrument, warn};
+
+use crate::IdentityProvider;
+use crate::conversation::{ConversationIdRef, ExternalServices, ServiceContext};
+use crate::{
+    ConvoOutcome, DeliveryService, RegistrationService,
+    conversation::{ChatError, Convo, GroupConvo},
+};
+
+/// This is a Test Wrapper of Demls MemberId Trait
+/// Libchat has its own trait that will need to be intergrated at somepoint.
+pub struct LocalDemlsMember {
+    name: String,
+}
+
+impl LocalDemlsMember {
+    pub fn new(name: impl Into<String>) -> Self {
+        Self { name: name.into() }
+    }
+}
+
+impl MemberId for LocalDemlsMember {
+    fn member_id_bytes(&self) -> &[u8] {
+        self.name.as_bytes()
+    }
+
+    fn member_id_display(&self) -> &str {
+        &self.name
+    }
+}
+
+/// Borrows an existing `IdentityProvider` but reports a namespaced `id()`,
+/// so the same identity can register multiple keypackage "flavors"
+/// (e.g. openmls vs. de-mls) without colliding in the registry.
+struct NamespacedIdentity<'a> {
+    inner: &'a dyn IdentityProvider,
+    id: IdentId,
+}
+
+impl<'a> NamespacedIdentity<'a> {
+    fn new(inner: &'a dyn IdentityProvider, namespace: &str) -> Self {
+        let id = IdentId::new(Self::prefix(inner.id(), namespace));
+        Self { inner, id }
+    }
+
+    fn prefix(id: &IdentId, namesapce: &str) -> String {
+        format!("{id}|{namesapce}")
+    }
+}
+
+impl IdentityProvider for NamespacedIdentity<'_> {
+    fn id(&self) -> IdentIdRef<'_> {
+        &self.id
+    }
+
+    fn display_name(&self) -> String {
+        self.inner.display_name()
+    }
+
+    fn sign(&self, payload: &[u8]) -> crypto::Ed25519Signature {
+        self.inner.sign(payload)
+    }
+
+    fn public_key(&self) -> &crypto::Ed25519VerifyingKey {
+        self.inner.public_key()
+    }
+}
+
+/// Namespace used for de-mls (GroupV2) keypackages, so they don't collide
+/// with the openmls (GroupV1) keypackage registered under the bare account id.
+const DEMLS_KEYPACKAGE_NAMESPACE: &str = "demls";
+
+struct DemlsSetup {
+    member: LocalDemlsMember,
+    factory: DefaultConversationPluginsFactory,
+    consensus_storage: <DefaultConsensusPlugin as ConsensusPlugin>::ConsensusStorage,
+    consensus_signer: EthereumConsensusSigner,
+    app_id: Vec<u8>,            // random bytes; echo-dedup key
+    config: ConversationConfig, // the ms-scale test timers, as before
+}
+
+impl DemlsSetup {
+    fn new(identity_name: String) -> Result<Self, ChatError> {
+        let member = LocalDemlsMember::new(identity_name);
+        let credentials = Arc::new(MlsCredentials::from_member_id(&member)?);
+        let factory = DefaultConversationPluginsFactory::new(
+            Arc::new(MemoryDeMlsStorage::new()),
+            credentials,
+        );
+        // TODO(config): TEST-ONLY millisecond timers. de-mls deadlines are real
+        // wall-clock, so the default 60s timers never fire under fast virtual
+        // time. Production needs a real config injected from the caller, not
+        // these hardcoded values.
+        let config = ConversationConfig {
+            commit_inactivity_duration: Duration::from_millis(50),
+            freeze_duration: Duration::from_millis(20),
+            voting_delay: Duration::from_millis(30),
+            election_voting_delay: Duration::from_millis(30),
+            consensus_timeout: Duration::from_millis(150),
+            proposal_expiration: Duration::from_millis(2000),
+            ..ConversationConfig::default()
+        };
+        Ok(DemlsSetup {
+            member,
+            factory,
+            consensus_storage: DefaultConsensusPlugin::new_storage(),
+            consensus_signer: EthereumConsensusSigner::new(PrivateKeySigner::random()),
+            app_id: rand_string(5).as_bytes().to_vec(),
+            config,
+        })
+    }
+
+    /// Call exactly once per Conversation construction.
+    fn deps(
+        &self,
+    ) -> ConversationDeps<'_, DefaultConsensusPlugin, DefaultConversationPluginsFactory> {
+        ConversationDeps {
+            plugins: &self.factory,
+            consensus: ConsensusServiceFor::<DefaultConsensusPlugin>::new_with_components(
+                self.consensus_storage.clone(),
+                DefaultConsensusPlugin::new_event_bus(),
+                self.consensus_signer.clone(),
+                10,
+            ),
+            identity: &self.member,
+            app_id: Arc::from(self.app_id.as_slice()),
+            config: self.config.clone(),
+            scoring_config: ScoringConfig::default(),
+            steward_list_config: StewardListConfig::default(),
+        }
+    }
+}
+
+pub struct GroupV2Convo {
+    convo_id: String,
+    setup: DemlsSetup,
+    conversation: Option<Conversation<DefaultConsensusPlugin, DefaultConversationPluginsFactory>>,
+    /// Member-ids we proposed via add_member. WelcomeReady now fires on
+    /// every member; we forward a welcome only to joiners WE invited.
+    pending_invites: Vec<Vec<u8>>,
+}
+
+impl std::fmt::Debug for GroupV2Convo {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("GroupV2Convo")
+            .field("convo_id", &self.convo_id)
+            .finish_non_exhaustive()
+    }
+}
+
+fn rand_string(n: usize) -> String {
+    let bytes: Vec<u8> = (0..n).map(|_| rand::random::<u8>()).collect();
+    hex::encode(bytes)
+}
+
+impl GroupV2Convo {
+    pub fn new<S: ExternalServices>(
+        service_ctx: &mut ServiceContext<S>,
+    ) -> Result<Self, ChatError> {
+        let setup = DemlsSetup::new(service_ctx.mls_identity.display_name())?;
+        let convo_id = rand_string(5);
+        let conversation = Conversation::create(&convo_id, setup.deps())?;
+        let convo = GroupV2Convo {
+            convo_id,
+            setup,
+            conversation: Some(conversation),
+            pending_invites: vec![],
+        };
+
+        convo.init(service_ctx)?;
+
+        Ok(convo)
+    }
+
+    /// Joiner side: register a fresh key package under the account name,
+    /// but do NOT start a conversation. `convo_id` stays empty until
+    /// [`Self::accept_welcome`] fills it.
+    pub fn new_pending<S: ExternalServices>(
+        service_ctx: &mut ServiceContext<S>,
+    ) -> Result<Self, ChatError> {
+        let name = service_ctx.mls_identity.display_name();
+        let setup = DemlsSetup::new(name.clone())?;
+        let kp = setup.factory.generate_key_package()?;
+
+        // TEMPORARY: Demls creates its own Provider which causes keys to be fragmented in different storage providers.
+        // The key registry does not support a method to namespace keys with the same identity. When the key is pulled down it cannot
+        // guarentee it was the one created with demls owned provider, resulting in failure.
+        // This workaround prefixes the ID used to store the keys, such that they do not conflict.
+        let namespaced =
+            NamespacedIdentity::new(&*service_ctx.mls_identity, DEMLS_KEYPACKAGE_NAMESPACE);
+        service_ctx
+            .registry
+            .register(&namespaced, kp.as_bytes().to_vec())
+            .map_err(ChatError::generic)?;
+
+        Ok(GroupV2Convo {
+            convo_id: String::new(),
+            setup,
+            conversation: None,
+            pending_invites: vec![],
+        })
+    }
+
+    /// Joiner side: ingest a de-mls welcome handed over the InboxV2 1-1
+    /// channel. `from_welcome` attaches MLS and applies the bundled
+    /// `ConversationSync` in one call; we then subscribe to the
+    /// conversation address and flush the join broadcast.
+    #[instrument(name = "groupv2.accept_welcome", skip_all, fields(user_id = %service_ctx.mls_identity.display_name()))]
+    pub fn accept_welcome<S: ExternalServices>(
+        &mut self,
+        service_ctx: &mut ServiceContext<S>,
+        welcome: &MemberWelcome,
+    ) -> Result<(), ChatError> {
+        let conv = Conversation::from_welcome(self.setup.deps(), welcome)?
+            .ok_or_else(|| ChatError::generic("welcome not addressed to this member"))?;
+        self.convo_id = conv.id().to_string();
+        self.conversation = Some(conv);
+        self.init(service_ctx)?; // subscribe
+        self.after_op(service_ctx)?; // flush join broadcast + schedule wakeup
+        Ok(())
+    }
+
+    fn delivery_address_from_id(convo_id: &str) -> String {
+        let hash = Blake2b::<U6>::new()
+            .chain_update("delivery_addr|")
+            .chain_update(convo_id)
+            .finalize();
+        hex::encode(hash)
+    }
+
+    fn init<S: ExternalServices>(
+        &self,
+        service_ctx: &mut ServiceContext<S>,
+    ) -> Result<(), ChatError> {
+        // Configure the delivery service to listen for the required delivery addresses.
+        service_ctx
+            .ds
+            .subscribe(&Self::delivery_address_from_id(&self.convo_id))
+            .map_err(ChatError::generic)?;
+        Ok(())
+    }
+
+    pub fn id(&self) -> ConversationIdRef<'_> {
+        &self.convo_id
+    }
+}
+
+impl<S> Convo<S> for GroupV2Convo
+where
+    S: ExternalServices,
+{
+    #[instrument(name = "groupv2.send_content", skip_all, fields(user_id = %service_ctx.mls_identity.display_name(), content))]
+    fn send_content(
+        &mut self,
+        service_ctx: &mut super::ServiceContext<S>,
+        content: &[u8],
+    ) -> Result<(), ChatError> {
+        let conv = self
+            .conversation
+            .as_mut()
+            .ok_or_else(|| ChatError::generic("conversation not found"))?;
+        conv.send_message(content.to_vec())?;
+        self.after_op(service_ctx)?;
+        Ok(())
+    }
+
+    #[instrument(name = "groupv2.handle_frame", skip_all, fields(user_id = %service_ctx.mls_identity.display_name()))]
+    fn handle_frame(
+        &mut self,
+        service_ctx: &mut super::ServiceContext<S>,
+        encoded_payload: EncryptedPayload,
+    ) -> Result<ConvoOutcome, ChatError> {
+        let bytes = match encoded_payload.encryption {
+            Some(encrypted_payload::Encryption::Plaintext(pt)) => pt.payload,
+            _ => {
+                return Err(ChatError::generic("Expected plaintext"));
+            }
+        };
+        let frame = GroupV2Frame::decode(bytes.as_ref()).map_err(ChatError::generic)?;
+        let inner = match frame.payload {
+            Some(GroupV2Payload::DeMlsWrapper(b)) => b.to_vec(),
+            _ => return Ok(ConvoOutcome::empty(self.convo_id.clone())),
+        };
+
+        let conv = self
+            .conversation
+            .as_mut()
+            .ok_or_else(|| ChatError::generic("no conversation"))?;
+        conv.process_inbound(&frame.sender_app_id, &inner)?;
+        conv.poll();
+        let events = self.after_op(service_ctx)?; // route + publish + re-arm, returns events
+
+        match self.events_to_content(&events) {
+            Some(o) => Ok(o),
+            None => {
+                warn!("returning None as ConvoOutcome");
+                Ok(ConvoOutcome::empty(self.convo_id.to_string()))
+            }
+        }
+    }
+
+    #[instrument(name = "groupv2.wakeup", skip_all, fields(user_id = %ctx.mls_identity.display_name()))]
+    fn wakeup(&mut self, ctx: &mut ServiceContext<S>) -> Result<(), ChatError> {
+        info!(convo = %self.convo_id, "Wakeup");
+        let Some(conv) = self.conversation.as_mut() else {
+            return Ok(()); // pending joiner: no deadlines exist yet
+        };
+        let outcome = conv.poll();
+        if outcome.leave_requested {
+            // Commit ejected us (or join expired). Real handling - drops
+            // this convo from its map;
+            tracing::warn!(convo = %self.convo_id, "conversation requested teardown");
+        }
+        self.after_op(ctx)?; // publish what poll produced + re-arm alarm
+        Ok(())
+    }
+}
+
+impl<S> GroupConvo<S> for GroupV2Convo
+where
+    S: ExternalServices,
+{
+    fn id(&self) -> ConversationIdRef<'_> {
+        &self.convo_id
+    }
+    #[instrument(name = "groupv2.add_member", skip_all, fields(user_id = %service_ctx.mls_identity.display_name()))]
+    fn add_member(
+        &mut self,
+        service_ctx: &mut ServiceContext<S>,
+        members: &[IdentIdRef],
+    ) -> Result<(), ChatError> {
+        // Record who WE invited before touching the conversation: after_op
+        // forwards a welcome only to joiners in pending_invites (member-id
+        // bytes == account name bytes for LocalDemlsMember).
+        let mut kps = Vec::with_capacity(members.len());
+        for member in members {
+            let device_id = NamespacedIdentity::prefix(member, DEMLS_KEYPACKAGE_NAMESPACE);
+            let kp_bytes = service_ctx
+                .registry
+                .retrieve(&device_id)
+                .map_err(ChatError::generic)?
+                .ok_or_else(|| ChatError::generic("No key package"))?;
+            self.pending_invites
+                .push(member.as_str().as_bytes().to_vec());
+            kps.push(kp_bytes);
+        }
+
+        let conv = self
+            .conversation
+            .as_mut()
+            .ok_or_else(|| ChatError::generic("no conversation"))?;
+        for kp_bytes in &kps {
+            conv.add_member(kp_bytes)?;
+        }
+        self.after_op(service_ctx)?;
+        Ok(())
+    }
+
+    // fn conversation_state(&self) -> Result<ConversationState, ChatError> {
+    //     Ok(self
+    //         .conversation
+    //         .as_ref()
+    //         .map(|c| c.state())
+    //         .unwrap_or(ConversationState::PendingJoin))
+    // }
+}
+
+impl GroupV2Convo {
+    fn after_op<S: ExternalServices>(
+        &mut self,
+        service_ctx: &mut ServiceContext<S>,
+    ) -> Result<Vec<ConversationEvent>, ChatError> {
+        let Some(conv) = self.conversation.as_ref() else {
+            return Ok(Vec::new()); // still pending join — nothing buffered
+        };
+        // Pull everything first (these are &self, take-all):
+        let events = conv.drain_events();
+        let outbound = conv.drain_outbound(); // Vec<de_mls::session::Outbound>
+        let wakeup = conv.next_wakeup_in();
+
+        // 1. Route welcomes for joiners WE invited (event fires on every member now).
+        for evt in &events {
+            if let ConversationEvent::WelcomeReady { welcome, .. } = evt {
+                for joiner in &welcome.joiner_identities {
+                    if let Some(i) = self.pending_invites.iter().position(|p| p == joiner) {
+                        self.pending_invites.remove(i);
+                        let name = String::from_utf8(joiner.clone()).map_err(ChatError::generic)?;
+                        crate::inbox_v2::invite_user_v2(
+                            &mut service_ctx.ds,
+                            &IdentId::new(name),
+                            welcome,
+                        )?;
+                    }
+                }
+            }
+        }
+
+        // 2. Publish
+        for out in outbound {
+            let frame = GroupV2Frame {
+                payload: Some(GroupV2Payload::DeMlsWrapper(out.payload.into())),
+                sender_app_id: out.sender, // was pkt.app_id
+            };
+            let payload = AddressedEncryptedPayload {
+                delivery_address: Self::delivery_address_from_id(&out.conversation_id),
+                data: EncryptedPayload {
+                    encryption: Some(encrypted_payload::Encryption::Plaintext(Plaintext {
+                        payload: frame.encode_to_vec().into(),
+                    })),
+                },
+            };
+            service_ctx
+                .ds
+                .publish(payload.into_envelope(out.conversation_id))
+                .map_err(ChatError::generic)?;
+        }
+
+        // 3. Re-arm the alarm with the conversation's earliest deadline.
+        if let Some(d) = wakeup {
+            service_ctx
+                .wakeup_service
+                .wakeup_in(d, self.convo_id.clone());
+        }
+        Ok(events)
+    }
+
+    fn events_to_content(&self, events: &[ConversationEvent]) -> Option<ConvoOutcome> {
+        events.iter().find_map(|evt| match evt {
+            ConversationEvent::AppMessage(AppMessageProto {
+                payload: Some(app_message::Payload::ConversationMessage(cm)),
+            }) => Some(ConvoOutcome {
+                convo_id: self.convo_id.clone().into(),
+                content: Some(Content {
+                    bytes: cm.message.clone(),
+                }),
+            }),
+            _ => None,
+        })
+    }
+}
+
+use prost::{Oneof, bytes::Bytes};
+
+#[derive(Clone, PartialEq, Message)]
+pub struct GroupV2Frame {
+    #[prost(oneof = "GroupV2Payload", tags = "2, 3")]
+    pub payload: Option<GroupV2Payload>,
+    #[prost(bytes = "vec", tag = "4")]
+    pub sender_app_id: Vec<u8>,
+}
+
+#[derive(Clone, PartialEq, Oneof)]
+pub enum GroupV2Payload {
+    #[prost(message, tag = "2")]
+    DeMlsWrapper(Bytes),
+    #[prost(message, tag = "3")]
+    MlsCommitMessage(Bytes),
+}
diff --git a/core/conversations/src/core.rs b/core/conversations/src/core.rs
index 291faaf..3e553d3 100644
--- a/core/conversations/src/core.rs
+++ b/core/conversations/src/core.rs
@@ -199,6 +199,13 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
     pub fn create_group_convo(
         &mut self,
         participants: &[IdentIdRef],
+    ) -> Result<ConversationId, ChatError> {
+        self.create_group_convo_v2(participants)
+    }
+
+    pub fn create_group_convo_v1(
+        &mut self,
+        participants: &[IdentIdRef],
     ) -> Result<ConversationId, ChatError> {
         // TODO: (P1) Ensure errors are handled properly. This is a high chance for
         // desynchronized state: MlsGroup persistence, conversation persistence, and
@@ -213,6 +220,25 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
             })?;
         convo.add_member(&mut self.services, participants)?;
         Ok(convo.id().to_string())
+    pub fn create_group_convo_v2(
+        &mut self,
+        participants: &[IdentIdRef],
+    ) -> Result<ConversationId, ChatError> {
+        // TODO: (P1) Ensure errors are handled properly. This is a high chance for
+        // desynchronized state: MlsGroup persistence, conversation persistence, and
+        // invite delivery all happen separately.
+        let mut convo = GroupV2Convo::new(&mut self.services)?;
+        self.services
+            .store
+            .save_conversation(&storage::ConversationMeta {
+                local_convo_id: convo.id().to_string(),
+                remote_convo_id: "0".into(),
+                kind: ConversationKind::GroupV1,
+            })?;
+        convo.add_member(&mut self.services, participants)?;
+        let convo_id = convo.id().to_string();
+
+        Ok(convo_id)
     }
 
     /// Add members to an existing group conversation.
diff --git a/core/conversations/src/errors.rs b/core/conversations/src/errors.rs
index 5b2bfe4..879e923 100644
--- a/core/conversations/src/errors.rs
+++ b/core/conversations/src/errors.rs
@@ -1,3 +1,4 @@
+use de_mls::{mls_crypto::MlsError, session::ConversationError};
 use openmls::{framing::errors::MlsMessageError, prelude::tls_codec};
 pub use thiserror::Error;
 
@@ -37,6 +38,10 @@ pub enum ChatError {
     KeyPackage(#[from] openmls::prelude::KeyPackageVerifyError),
     #[error("Delivery: {0}")]
     Delivery(String),
+    #[error("mls error: {0}")]
+    MlsError(#[from] MlsError),
+    #[error("demls error: {0}")]
+    DeMlsError(#[from] ConversationError),
 }
 
 impl ChatError {
diff --git a/core/conversations/src/inbox_v2.rs b/core/conversations/src/inbox_v2.rs
index a713b66..c898902 100644
--- a/core/conversations/src/inbox_v2.rs
+++ b/core/conversations/src/inbox_v2.rs
@@ -47,17 +47,43 @@ pub trait MlsProvider: OpenMlsProvider {
     ) -> Result<(), ChatError>;
 }
 
+/// Deliver a de-mls welcome to `account_id` over its InboxV2 1-1 channel.
+/// Function mirroring the GroupV1 `invite_user` path, but carrying a de-mls `MemberWelcome`.
+pub fn invite_user_v2<DS: DeliveryService>(
+    ds: &mut DS,
+    account_id: IdentIdRef,
+    welcome: &MemberWelcome,
+) -> Result<(), ChatError> {
+    let frame = InboxV2Frame {
+        payload: Some(InviteType::GroupV2(welcome.encode_to_vec())),
+    };
+    let envelope = EnvelopeV1 {
+        conversation_hint: conversation_id_for(account_id),
+        salt: 0,
+        payload: frame.encode_to_vec().into(),
+    };
+    ds.publish(AddressedEnvelope {
+        delivery_address: delivery_address_for(account_id),
+        data: envelope.encode_to_vec(),
+    })
+    .map_err(ChatError::generic)
+}
+
 /// An PQ focused Conversation initializer.
 /// InboxV2 Incorporates an Account based identity system to support PQ based conversation protocols
 /// such as MLS.
 pub struct InboxV2 {
     // Account_id field is an owned value, so it can be returned via reference.
     ident_id: IdentId,
+    pending_demls: RefCell<Option<GroupV2Convo>>,
 }
 
 impl InboxV2 {
     pub fn new(ident_id: IdentId) -> Self {
-        Self { ident_id }
+        Self {
+            ident_id,
+            pending_demls: RefCell::new(None),
+        }
     }
 
     pub fn ident_id(&self) -> IdentIdRef<'_> {
@@ -66,7 +92,7 @@ impl InboxV2 {
 
     /// Submit MlsKeypackage to registration service
     pub fn register<S: ExternalServices>(
-        &self,
+        &mut self,
         cx: &mut ServiceContext<S>,
     ) -> Result<(), ChatError> {
         let keypackage_bytes = Self::create_keypackage(cx)?.tls_serialize_detached()?;
@@ -75,7 +101,15 @@ impl InboxV2 {
         // "LastResort" package or publish multiple
         cx.registry
             .register(&cx.mls_identity, keypackage_bytes)
-            .map_err(ChatError::generic)
+            .map_err(ChatError::generic)?;
+
+        // de-mls (GroupV2) joiner: build a conversation-less User and register
+        // its de-mls key package under the same account name. This shadows the
+        // OpenMLS key package above in the registry; GroupV2 is the path the
+        // de-mls integration exercises.
+        *self.pending_demls.borrow_mut() = Some(GroupV2Convo::new_pending(cx)?);
+
+        Ok(())
     }
 
     pub fn delivery_address(&self) -> String {
@@ -88,18 +122,35 @@ impl InboxV2 {
 
     pub fn handle_frame<S: ExternalServices>(
         &self,
+        service_ctx: &mut ServiceContext<S>,
         payload_bytes: &[u8],
-        cx: &mut ServiceContext<S>,
-    ) -> Result<InboxOutcome, ChatError> {
-        let inbox_frame = InboxV2Frame::decode(payload_bytes)?;
-
+    ) -> Result<Option<Box<dyn GroupConvo<S>>>, ChatError> {
+        // On a broadcast transport the inbox address also receives traffic
+        // that isn't an invite (or that prost decodes into an empty frame).
+        // Treat anything we can't interpret as "not for us" and skip it,
+        // rather than failing the whole poll cycle.
+        let Ok(inbox_frame) = InboxV2Frame::decode(payload_bytes) else {
+            return Ok(None);
+        };
         let Some(payload) = inbox_frame.payload else {
-            return Err(ChatError::BadParsing("InboxV2Payload missing"));
+            return Ok(None);
         };
 
         match payload {
-            InviteType::GroupV1(group_v1_heavy_invite) => {
-                self.handle_heavy_invite(group_v1_heavy_invite, cx)
+            InviteType::GroupV1(inv) => {
+                Ok(Some(Box::new(self.handle_heavy_invite(service_ctx, inv)?)))
+            }
+            InviteType::GroupV2(welcome_bytes) => {
+                info!("Process WelcomeMessage");
+                let mut convo = self
+                    .pending_demls
+                    .borrow_mut()
+                    .take()
+                    .ok_or_else(|| ChatError::generic("no pending de-mls convo"))?;
+                let mw =
+                    MemberWelcome::decode(welcome_bytes.as_slice()).map_err(ChatError::generic)?;
+                convo.accept_welcome(service_ctx, &mw)?;
+                Ok(Some(Box::new(convo)))
             }
         }
     }
@@ -244,7 +295,7 @@ impl InboxV2 {
 
 #[derive(Clone, PartialEq, Message)]
 pub struct InboxV2Frame {
-    #[prost(oneof = "InviteType", tags = "1")]
+    #[prost(oneof = "InviteType", tags = "1, 2")]
     pub payload: Option<InviteType>,
 }
 
@@ -252,6 +303,8 @@ pub struct InboxV2Frame {
 pub enum InviteType {
     #[prost(message, tag = "1")]
     GroupV1(GroupV1HeavyInvite),
+    #[prost(bytes, tag = "2")]
+    GroupV2(Vec<u8>),
 }
 
 #[derive(Clone, PartialEq, Message)]
diff --git a/core/conversations/src/lib.rs b/core/conversations/src/lib.rs
index 3f88265..b701b12 100644
--- a/core/conversations/src/lib.rs
+++ b/core/conversations/src/lib.rs
@@ -27,8 +27,8 @@ pub use outcomes::{
     Content, ConversationClass, ConvoOutcome, InboxOutcome, NewConversation, PayloadOutcome,
 };
 pub use service_context::ExternalServices;
-pub use shared_traits::IdentityProvider;
 pub use service_traits::{DeliveryService, RegistrationService, WakeupService};
+pub use shared_traits::{IdentId, IdentIdRef, IdentityProvider};
 pub use storage::ConversationKind;
 pub use types::AddressedEnvelope;
 pub use utils::hex_trunc;