diff --git a/core/conversations/src/conversation.rs b/core/conversations/src/conversation.rs
index c8816fa..6f17892 100644
--- a/core/conversations/src/conversation.rs
+++ b/core/conversations/src/conversation.rs
@@ -1,3 +1,4 @@
+mod direct_v1;
 pub mod group_v1;
 mod group_v2;
 mod privatev1;
@@ -6,6 +7,7 @@ pub use crate::errors::ChatError;
 use crate::outcomes::ConvoOutcome;
 use crate::proto::EncryptedPayload;
 use crate::service_context::{ExternalServices, ServiceContext};
+pub use direct_v1::DirectV1Convo;
 pub use group_v1::GroupV1Convo;
 pub use group_v2::GroupV2Convo;
 pub use privatev1::PrivateV1Convo;
@@ -15,7 +17,7 @@ pub type ConversationId = String;
 pub type ConversationIdRef<'a> = &'a str;
 
 /// Behaviour shared by every conversation kind.
-pub(crate) trait Convo<S: ExternalServices> {
+pub(crate) trait Convo<S: ExternalServices>: Identified + Send {
     fn send_content(&mut self, cx: &mut ServiceContext<S>, content: &[u8])
     -> Result<(), ChatError>;
 
@@ -40,6 +42,8 @@ pub(crate) trait GroupConvo<S: ExternalServices>: Convo<S> + std::fmt::Debug + S
         cx: &mut ServiceContext<S>,
         members: &[IdentIdRef],
     ) -> Result<(), ChatError>;
+}
 
+pub(crate) trait Identified {
     fn id(&self) -> ConversationIdRef<'_>;
 }
diff --git a/core/conversations/src/conversation/direct_v1.rs b/core/conversations/src/conversation/direct_v1.rs
new file mode 100644
index 0000000..f75bdb0
--- /dev/null
+++ b/core/conversations/src/conversation/direct_v1.rs
@@ -0,0 +1,61 @@
+use chat_proto::logoschat::encryption::EncryptedPayload;
+use shared_traits::IdentIdRef;
+
+use crate::{
+    ChatError, ExternalServices,
+    conversation::{ConversationIdRef, Convo, GroupConvo, GroupV1Convo, Identified},
+    service_context::ServiceContext,
+};
+
+type DelegateGroup = GroupV1Convo;
+
+/// A Conversation between two participants.
+#[derive(Debug)]
+pub struct DirectV1Convo {
+    inner_group: DelegateGroup,
+}
+
+impl DirectV1Convo {
+    // Constructor must accept multiple IdentId's
+    // While the conversation is limited to 2 participants, each participants may
+    // have multiple Installations.
+    pub fn new<S: ExternalServices>(
+        cx: &mut ServiceContext<S>,
+        members: &[IdentIdRef],
+    ) -> Result<Self, ChatError> {
+        let mut inner_group = DelegateGroup::new(cx)?;
+        inner_group.add_member(cx, members)?;
+        Ok(Self { inner_group })
+    }
+}
+
+impl Identified for DirectV1Convo {
+    fn id(&self) -> ConversationIdRef<'_> {
+        self.inner_group.id()
+    }
+}
+
+impl<S> Convo<S> for DirectV1Convo
+where
+    S: ExternalServices,
+{
+    fn send_content(
+        &mut self,
+        cx: &mut ServiceContext<S>,
+        content: &[u8],
+    ) -> Result<(), super::ChatError> {
+        self.inner_group.send_content(cx, content)
+    }
+
+    fn handle_frame(
+        &mut self,
+        cx: &mut ServiceContext<S>,
+        enc: EncryptedPayload,
+    ) -> Result<crate::ConvoOutcome, ChatError> {
+        self.inner_group.handle_frame(cx, enc)
+    }
+
+    fn wakeup(&mut self, service_ctx: &mut ServiceContext<S>) -> Result<(), ChatError> {
+        self.inner_group.wakeup(service_ctx)
+    }
+}
diff --git a/core/conversations/src/conversation/group_v1.rs b/core/conversations/src/conversation/group_v1.rs
index 0d0d433..ba59a9e 100644
--- a/core/conversations/src/conversation/group_v1.rs
+++ b/core/conversations/src/conversation/group_v1.rs
@@ -11,12 +11,13 @@ use prost::Message as _;
 use shared_traits::IdentIdRef;
 
 use crate::account_directory::{AccountDirectory, resolve_device_ids};
+use crate::conversation::ConversationIdRef;
 use crate::inbox_v2::MlsProvider;
 use crate::service_context::{ExternalServices, ServiceContext};
 
 use crate::{
     DeliveryService, IdentityProvider,
-    conversation::{ChatError, Convo, GroupConvo},
+    conversation::{ChatError, Convo, GroupConvo, Identified},
     outcomes::{Content, ConvoOutcome},
     service_traits::KeyPackageProvider,
     types::AddressedEncryptedPayload,
@@ -174,10 +175,6 @@ impl GroupV1Convo {
         Ok(keypackages)
     }
 
-    pub fn id(&self) -> &str {
-        &self.convo_id
-    }
-
     fn send_message<S: ExternalServices>(
         &mut self,
         content: &[u8],
@@ -205,6 +202,12 @@ impl GroupV1Convo {
     }
 }
 
+impl Identified for GroupV1Convo {
+    fn id(&self) -> ConversationIdRef<'_> {
+        &self.convo_id
+    }
+}
+
 impl<S: ExternalServices> Convo<S> for GroupV1Convo {
     fn send_content(
         &mut self,
@@ -344,8 +347,4 @@ impl<S: ExternalServices> GroupConvo<S> for GroupV1Convo {
             .publish(env)
             .map_err(|e| ChatError::Generic(format!("Publish: {e}")))
     }
-
-    fn id(&self) -> super::ConversationIdRef<'_> {
-        &self.convo_id
-    }
 }
diff --git a/core/conversations/src/conversation/group_v2.rs b/core/conversations/src/conversation/group_v2.rs
index c3f5fad..6c37465 100644
--- a/core/conversations/src/conversation/group_v2.rs
+++ b/core/conversations/src/conversation/group_v2.rs
@@ -34,7 +34,7 @@ use crate::IdentityProvider;
 use crate::conversation::{ConversationIdRef, ExternalServices, ServiceContext};
 use crate::{
     ConvoOutcome, DeliveryService, RegistrationService,
-    conversation::{ChatError, Convo, GroupConvo},
+    conversation::{ChatError, Convo, GroupConvo, Identified},
 };
 
 /// Namespace used for de-mls (GroupV2) keypackages, so they don't collide
@@ -288,6 +288,12 @@ impl GroupV2Convo {
     }
 }
 
+impl Identified for GroupV2Convo {
+    fn id(&self) -> ConversationIdRef<'_> {
+        &self.convo_id
+    }
+}
+
 impl<S> Convo<S> for GroupV2Convo
 where
     S: ExternalServices,
@@ -372,9 +378,6 @@ 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,
diff --git a/core/conversations/src/conversation/privatev1.rs b/core/conversations/src/conversation/privatev1.rs
index 8bb1a1e..a6e278c 100644
--- a/core/conversations/src/conversation/privatev1.rs
+++ b/core/conversations/src/conversation/privatev1.rs
@@ -14,7 +14,7 @@ use storage::{ConversationKind, ConversationMeta, ConversationStore};
 
 use crate::{
     DeliveryService,
-    conversation::{ChatError, ConversationId, Convo},
+    conversation::{ChatError, ConversationId, ConversationIdRef, Convo, Identified},
     errors::EncryptionError,
     inbox::PRIVATE_V1_INBOX_ADDRESS,
     outcomes::{Content, ConvoOutcome},
@@ -200,10 +200,6 @@ impl PrivateV1Convo {
         }
     }
 
-    pub fn id(&self) -> &str {
-        &self.local_convo_id
-    }
-
     pub fn encrypt_content<S: RatchetStore>(
         &mut self,
         content: &[u8],
@@ -235,6 +231,12 @@ impl PrivateV1Convo {
     }
 }
 
+impl Identified for PrivateV1Convo {
+    fn id(&self) -> ConversationIdRef<'_> {
+        &self.local_convo_id
+    }
+}
+
 impl<S: ExternalServices> Convo<S> for PrivateV1Convo {
     fn send_content(
         &mut self,
diff --git a/core/conversations/src/core.rs b/core/conversations/src/core.rs
index 0997afa..37fbe71 100644
--- a/core/conversations/src/core.rs
+++ b/core/conversations/src/core.rs
@@ -1,5 +1,7 @@
 use crate::causal_history::{CausalHistoryStore, MissingMessage};
-use crate::conversation::{ConversationIdRef, GroupV1Convo, GroupV2Convo, PrivateV1Convo};
+use crate::conversation::{
+    ConversationIdRef, DirectV1Convo, GroupV1Convo, GroupV2Convo, Identified, PrivateV1Convo,
+};
 use crate::service_context::{ExternalServices, ServiceContext};
 use crate::{DeliveryService, IdentityProvider, RegistrationService, WakeupService};
 use crate::{
@@ -14,6 +16,7 @@ use crypto::{Identity, PublicKey};
 use openmls::group::GroupId;
 use shared_traits::IdentIdRef;
 use std::collections::HashMap;
+use std::fmt::Debug;
 use storage::{ChatStore, ConversationKind, ConversationStore};
 use tracing::{info, instrument};
 
@@ -182,7 +185,14 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
         self.services.identity.public_key()
     }
 
-    pub fn create_private_convo(
+    pub fn create_direct_convo(
+        &mut self,
+        members: &[IdentIdRef],
+    ) -> Result<ConversationId, ChatError> {
+        self.create_direct_convo_v1(members)
+    }
+
+    pub fn create_private_convo_v1(
         &mut self,
         remote_bundle: &Introduction,
         content: &[u8],
@@ -202,6 +212,17 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
         Ok(convo_id)
     }
 
+    pub fn create_direct_convo_v1(
+        &mut self,
+        members: &[IdentIdRef],
+    ) -> Result<ConversationId, ChatError> {
+        let convo = DirectV1Convo::new(&mut self.services, members)?;
+        let convo_id = convo.id().to_string();
+        self.register_convo(ConvoTypeOwned::Direct(Box::new(convo)))?;
+
+        Ok(convo_id)
+    }
+
     pub fn create_group_convo(
         &mut self,
         participants: &[IdentIdRef],
@@ -264,6 +285,10 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
                 ConvoTypeOwned::Group(group_convo) => {
                     group_convo.add_member(&mut self.services, members)
                 }
+                ConvoTypeOwned::Direct(convo) => Err(ChatError::UnsupportedFunction(
+                    convo.id().into(),
+                    "Add Member".into(),
+                )),
             }
         } else {
             let mut convo = self.load_group_convo(convo_id)?;
@@ -395,6 +420,7 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
         };
         let convo = match convo {
             ConvoTypeOwned::Group(c) => c.as_mut(),
+            ConvoTypeOwned::Direct(c) => c.as_mut(),
         };
 
         convo.wakeup(&mut self.services)
@@ -464,15 +490,24 @@ impl<'a, S: ExternalServices + 'static> Core<S> {
     }
 }
 
-#[derive(Debug)]
 enum ConvoTypeOwned<S: ExternalServices> {
-    // Pairwise(Box<dyn BaseConvo<S>>),
+    Direct(Box<dyn Convo<S>>),
     Group(Box<dyn GroupConvo<S>>),
 }
 
-impl<'a, S: ExternalServices> ConvoTypeOwned<S> {
-    pub fn id(&'a self) -> ConversationIdRef<'a> {
+impl<S: ExternalServices> Debug for ConvoTypeOwned<S> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
+            Self::Direct(arg0) => f.debug_tuple("Pairwise").field(&arg0.id()).finish(),
+            Self::Group(arg0) => f.debug_tuple("Group").field(&arg0.id()).finish(),
+        }
+    }
+}
+
+impl<S: ExternalServices> Identified for ConvoTypeOwned<S> {
+    fn id(&self) -> ConversationIdRef<'_> {
+        match self {
+            ConvoTypeOwned::Direct(convo) => convo.id(),
             ConvoTypeOwned::Group(group_convo) => group_convo.id(),
         }
     }
@@ -486,6 +521,7 @@ impl<S: ExternalServices> Convo<S> for ConvoTypeOwned<S> {
     ) -> Result<(), ChatError> {
         match self {
             ConvoTypeOwned::Group(group_convo) => group_convo.send_content(cx, content),
+            ConvoTypeOwned::Direct(convo) => convo.send_content(cx, content),
         }
     }
 
@@ -496,12 +532,14 @@ impl<S: ExternalServices> Convo<S> for ConvoTypeOwned<S> {
     ) -> Result<ConvoOutcome, ChatError> {
         match self {
             ConvoTypeOwned::Group(group_convo) => group_convo.handle_frame(cx, enc),
+            ConvoTypeOwned::Direct(convo) => convo.handle_frame(cx, enc),
         }
     }
 
     fn wakeup(&mut self, service_ctx: &mut ServiceContext<S>) -> Result<(), ChatError> {
         match self {
             ConvoTypeOwned::Group(group_convo) => group_convo.wakeup(service_ctx),
+            ConvoTypeOwned::Direct(convo) => convo.wakeup(service_ctx),
         }
     }
 }
diff --git a/core/conversations/src/errors.rs b/core/conversations/src/errors.rs
index f49a8d6..40aedde 100644
--- a/core/conversations/src/errors.rs
+++ b/core/conversations/src/errors.rs
@@ -4,6 +4,8 @@ pub use thiserror::Error;
 
 use storage::StorageError;
 
+use crate::ConversationId;
+
 #[derive(Error, Debug)]
 pub enum ChatError {
     #[error("protocol error: {0:?}")]
@@ -42,6 +44,9 @@ pub enum ChatError {
     MlsError(#[from] MlsError),
     #[error("demls error: {0}")]
     DeMlsError(#[from] ConversationError),
+    // Used when a core function is called with a convo_id which is unsupported
+    #[error("convo:{0} does not support {1}")]
+    UnsupportedFunction(ConversationId, String),
 }
 
 impl ChatError {
diff --git a/core/conversations/src/inbox_v2.rs b/core/conversations/src/inbox_v2.rs
index 91de64f..c9d663c 100644
--- a/core/conversations/src/inbox_v2.rs
+++ b/core/conversations/src/inbox_v2.rs
@@ -21,6 +21,7 @@ use crate::RegistrationService;
 use crate::conversation::GroupConvo;
 use crate::conversation::GroupV1Convo;
 use crate::conversation::GroupV2Convo;
+use crate::conversation::Identified as _;
 use crate::service_context::{ExternalServices, ServiceContext};
 use crate::utils::{blake2b_hex, hash_size};
 use crate::{
diff --git a/core/integration_tests_core/tests/private_integration.rs b/core/integration_tests_core/tests/private_integration.rs
index 61e9584..55819e0 100644
--- a/core/integration_tests_core/tests/private_integration.rs
+++ b/core/integration_tests_core/tests/private_integration.rs
@@ -87,7 +87,7 @@ fn ctx_integration() {
 
     // Saro initiates conversation with Raya
     let mut content = vec![10];
-    let saro_convo_id = saro.create_private_convo(&intro, &content).unwrap();
+    let saro_convo_id = saro.create_private_convo_v1(&intro, &content).unwrap();
 
     // Raya receives the invite + initial message
     let initial = recv_one(&mut raya);
@@ -178,7 +178,7 @@ fn conversation_metadata_persistence() {
 
     let bundle = alice.create_intro_bundle().unwrap();
     let intro = Introduction::try_from(bundle.as_slice()).unwrap();
-    bob.create_private_convo(&intro, b"hi").unwrap();
+    bob.create_private_convo_v1(&intro, b"hi").unwrap();
 
     let result = recv_one(&mut alice);
     let PayloadOutcome::Inbox(io) = result else {
@@ -219,7 +219,7 @@ fn conversation_full_flow() {
 
     let bundle = alice.create_intro_bundle().unwrap();
     let intro = Introduction::try_from(bundle.as_slice()).unwrap();
-    let bob_convo_id = bob.create_private_convo(&intro, b"hello").unwrap();
+    let bob_convo_id = bob.create_private_convo_v1(&intro, b"hello").unwrap();
 
     let result = recv_one(&mut alice);
     let PayloadOutcome::Inbox(io) = result else {
diff --git a/core/integration_tests_core/tests/test_direct_v1.rs b/core/integration_tests_core/tests/test_direct_v1.rs
new file mode 100644
index 0000000..da050d1
--- /dev/null
+++ b/core/integration_tests_core/tests/test_direct_v1.rs
@@ -0,0 +1,43 @@
+use integration_tests_core::TestHarness;
+use tracing::info;
+
+#[test]
+fn happypath_roundtrip() {
+    let _ = tracing_subscriber::fmt()
+        .with_max_level(tracing::Level::INFO)
+        .with_test_writer()
+        .try_init();
+
+    const S_M1: &[u8] = b"Marco";
+    const R_M1: &[u8] = b"Polo";
+
+    // Initialize TestHarness with 2 clients
+    let mut harness = TestHarness::<2>::new(|_, _| {});
+
+    //Saro Create Convo
+    let particpant = harness.raya().addr();
+    let convo_id = harness
+        .saro()
+        .create_direct_convo_v1(&[&particpant])
+        .expect("saro create group");
+
+    // Carry the invite through (commit, WelcomeReady, routing to Raya's inbox,
+    // accept_welcome); settle until Raya has joined.
+    harness.process_until_label("Saro Send", |h| h.raya().convo_count() == 1);
+
+    // Saro sends a message; settle until Raya receives it.
+    info!(target: "chat", "Saro -> sending: {S_M1:?}");
+    harness
+        .saro()
+        .send_content(&convo_id, S_M1)
+        .expect("saro send");
+
+    harness.process_until(|h| h.raya().check(&convo_id, S_M1));
+
+    // Raya replies; settle until Saro receives it.
+    info!(target: "chat", "Raya -> sending:{R_M1:?}");
+    harness.raya().send_content(&convo_id, R_M1).unwrap();
+    harness.process_until(|h| h.saro().check(&convo_id, R_M1));
+
+    assert!(harness.saro().check(&convo_id, R_M1));
+}
diff --git a/crates/client/src/client.rs b/crates/client/src/client.rs
index 17b5439..4337bf9 100644
--- a/crates/client/src/client.rs
+++ b/crates/client/src/client.rs
@@ -4,8 +4,8 @@ use std::thread::{self, JoinHandle};
 use components::{EphemeralRegistry, ThreadedWakeupService, WakeupEvent};
 use crossbeam_channel::{Receiver, Sender, select};
 use libchat::{
-    ChatError, ChatStorage, ConversationId, ConvoOutcome, Core, DeliveryService, InboxOutcome,
-    Introduction, PayloadOutcome, RegistrationService, StorageConfig,
+    ChatError, ChatStorage, ConversationId, ConvoOutcome, Core, DeliveryService, IdentId,
+    IdentIdRef, InboxOutcome, Introduction, PayloadOutcome, RegistrationService, StorageConfig,
 };
 use logos_account::TestLogosAccount;
 use parking_lot::Mutex;
@@ -14,6 +14,8 @@ use crate::errors::ClientError;
 use crate::event::Event;
 
 type ClientCore<T, R> = Core<(TestLogosAccount, T, R, ThreadedWakeupService, ChatStorage)>;
+type AccountAddressRef<'a> = &'a str;
+type LocalSignerId = IdentId;
 
 /// The transport as the client sees it: a [`DeliveryService`] for outbound
 /// publishing plus the inbound payload stream the worker drains. One object owns
@@ -158,8 +160,24 @@ where
         self.core.lock().create_intro_bundle().map_err(Into::into)
     }
 
+    // Creates a conversation between two Accounts.
+    pub fn create_direct_conversation(
+        &mut self,
+        account: AccountAddressRef,
+    ) -> Result<ConversationId, ClientError> {
+        let signers = self.signers_from_account(account)?;
+        let signer_refs: Vec<IdentIdRef> = signers.iter().collect();
+
+        self.core
+            .lock()
+            .create_direct_convo(&signer_refs)
+            .map_err(Into::into)
+    }
+
     /// Parse intro bundle bytes and initiate a private conversation. Outbound
     /// envelopes are published by the core. Returns this side's conversation ID.
+    ///
+    /// This function will be deprecated in the future. Use `create_direct_conversation`
     pub fn create_conversation(
         &mut self,
         intro_bundle: &[u8],
@@ -168,7 +186,7 @@ where
         let intro = Introduction::try_from(intro_bundle)?;
         self.core
             .lock()
-            .create_private_convo(&intro, initial_content)
+            .create_private_convo_v1(&intro, initial_content)
             .map_err(Into::into)
     }
 
@@ -185,6 +203,15 @@ where
             .send_content(convo_id, content)
             .map_err(Into::into)
     }
+
+    // Get signers for a given AccountAddress.
+    fn signers_from_account(
+        &self,
+        account: AccountAddressRef,
+    ) -> Result<Vec<LocalSignerId>, ClientError> {
+        // Assume Account = LocalSigner until Account is ready
+        Ok(vec![IdentId::new(account.to_string())])
+    }
 }
 
 impl<T: DeliveryService, R: RegistrationService> Drop for ChatClient<T, R> {
diff --git a/extensions/components/src/contact_registry.rs b/extensions/components/src/contact_registry.rs
index acb42c7..6d63e33 100644
--- a/extensions/components/src/contact_registry.rs
+++ b/extensions/components/src/contact_registry.rs
@@ -1,114 +1,2 @@
-use std::{
-    collections::HashMap,
-    fmt::Debug,
-    sync::{Arc, Mutex},
-};
-
-use crypto::Ed25519VerifyingKey;
-use libchat::{
-    AccountDirectory, DeviceSet, IdentityProvider, RegistrationService, SignedDeviceBundle,
-    verify_bundle,
-};
-
+pub mod ephemeral;
 pub mod http;
-
-/// A Contact Registry used for Tests.
-/// This implementation stores bundle bytes and then returns them when
-/// retrieved.
-///
-/// Like the real `keypackage-registry`, one object serves both roles: a
-/// keypackage store ([`RegistrationService`]) keyed by `device_id`, and an
-/// account → device directory ([`AccountDirectory`]) keyed by the hex account key.
-#[derive(Clone, Default)]
-pub struct EphemeralRegistry {
-    key_packages: Arc<Mutex<HashMap<String, Vec<u8>>>>,
-    installations: Arc<Mutex<HashMap<String, SignedDeviceBundle>>>,
-}
-
-impl EphemeralRegistry {
-    pub fn new() -> Self {
-        Self::default()
-    }
-}
-
-impl Debug for EphemeralRegistry {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        let registry = self.key_packages.lock().unwrap();
-        let truncated: Vec<(&String, String)> = registry
-            .iter()
-            .map(|(k, v)| {
-                let hex = if v.len() <= 8 {
-                    hex::encode(v)
-                } else {
-                    format!(
-                        "{}..{}",
-                        hex::encode(&v[..4]),
-                        hex::encode(&v[v.len() - 4..])
-                    )
-                };
-                (k, hex)
-            })
-            .collect();
-        f.debug_struct("EphemeralRegistry")
-            .field("registry", &truncated)
-            .finish()
-    }
-}
-
-impl RegistrationService for EphemeralRegistry {
-    type Error = String;
-
-    fn register(
-        &mut self,
-        identity: &dyn IdentityProvider,
-        key_bundle: Vec<u8>,
-    ) -> Result<(), <Self as RegistrationService>::Error> {
-        self.key_packages
-            .lock()
-            .unwrap()
-            .insert(identity.id().to_string(), key_bundle);
-        Ok(())
-    }
-
-    fn retrieve(
-        &self,
-        device_id: &str,
-    ) -> Result<Option<Vec<u8>>, <Self as RegistrationService>::Error> {
-        Ok(self.key_packages.lock().unwrap().get(device_id).cloned())
-    }
-}
-
-/// Account → device directory, verifying each bundle on `fetch` exactly as the
-/// HTTP client does so callers exercise the same trust path without a server.
-impl AccountDirectory for EphemeralRegistry {
-    type Error = String;
-
-    fn publish(
-        &mut self,
-        bundle: &SignedDeviceBundle,
-    ) -> Result<(), <Self as AccountDirectory>::Error> {
-        self.installations
-            .lock()
-            .unwrap()
-            .insert(hex::encode(bundle.account_pub.as_ref()), bundle.clone());
-        Ok(())
-    }
-
-    fn fetch(
-        &self,
-        account: &Ed25519VerifyingKey,
-    ) -> Result<Option<DeviceSet>, <Self as AccountDirectory>::Error> {
-        let Some(bundle) = self
-            .installations
-            .lock()
-            .unwrap()
-            .get(&hex::encode(account.as_ref()))
-            .cloned()
-        else {
-            return Ok(None);
-        };
-        verify_bundle(account, &bundle)
-            .map(Some)
-            .map_err(|e| e.to_string())
-    }
-}
diff --git a/extensions/components/src/contact_registry/ephemeral.rs b/extensions/components/src/contact_registry/ephemeral.rs
new file mode 100644
index 0000000..8b28c70
--- /dev/null
+++ b/extensions/components/src/contact_registry/ephemeral.rs
@@ -0,0 +1,112 @@
+use std::{
+    collections::HashMap,
+    fmt::Debug,
+    sync::{Arc, Mutex},
+};
+
+use crypto::Ed25519VerifyingKey;
+use libchat::{
+    AccountDirectory, DeviceSet, IdentityProvider, RegistrationService, SignedDeviceBundle,
+    verify_bundle,
+};
+
+/// A Contact Registry used for Tests.
+/// This implementation stores bundle bytes and then returns them when
+/// retrieved.
+///
+/// Like the real `keypackage-registry`, one object serves both roles: a
+/// keypackage store ([`RegistrationService`]) keyed by `device_id`, and an
+/// account → device directory ([`AccountDirectory`]) keyed by the hex account key.
+#[derive(Clone, Default)]
+pub struct EphemeralRegistry {
+    key_packages: Arc<Mutex<HashMap<String, Vec<u8>>>>,
+    installations: Arc<Mutex<HashMap<String, SignedDeviceBundle>>>,
+}
+
+impl EphemeralRegistry {
+    pub fn new() -> Self {
+        Self::default()
+    }
+}
+
+impl Debug for EphemeralRegistry {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let registry = self.key_packages.lock().unwrap();
+        let truncated: Vec<(&String, String)> = registry
+            .iter()
+            .map(|(k, v)| {
+                let hex = if v.len() <= 8 {
+                    hex::encode(v)
+                } else {
+                    format!(
+                        "{}..{}",
+                        hex::encode(&v[..4]),
+                        hex::encode(&v[v.len() - 4..])
+                    )
+                };
+                (k, hex)
+            })
+            .collect();
+        f.debug_struct("EphemeralRegistry")
+            .field("registry", &truncated)
+            .finish()
+    }
+}
+
+impl RegistrationService for EphemeralRegistry {
+    type Error = String;
+
+    fn register(
+        &mut self,
+        identity: &dyn IdentityProvider,
+        key_bundle: Vec<u8>,
+    ) -> Result<(), <Self as RegistrationService>::Error> {
+        self.key_packages
+            .lock()
+            .unwrap()
+            .insert(identity.id().to_string(), key_bundle);
+        Ok(())
+    }
+
+    fn retrieve(
+        &self,
+        device_id: &str,
+    ) -> Result<Option<Vec<u8>>, <Self as RegistrationService>::Error> {
+        Ok(self.key_packages.lock().unwrap().get(device_id).cloned())
+    }
+}
+
+/// Account → device directory, verifying each bundle on `fetch` exactly as the
+/// HTTP client does so callers exercise the same trust path without a server.
+impl AccountDirectory for EphemeralRegistry {
+    type Error = String;
+
+    fn publish(
+        &mut self,
+        bundle: &SignedDeviceBundle,
+    ) -> Result<(), <Self as AccountDirectory>::Error> {
+        self.installations
+            .lock()
+            .unwrap()
+            .insert(hex::encode(bundle.account_pub.as_ref()), bundle.clone());
+        Ok(())
+    }
+
+    fn fetch(
+        &self,
+        account: &Ed25519VerifyingKey,
+    ) -> Result<Option<DeviceSet>, <Self as AccountDirectory>::Error> {
+        let Some(bundle) = self
+            .installations
+            .lock()
+            .unwrap()
+            .get(&hex::encode(account.as_ref()))
+            .cloned()
+        else {
+            return Ok(None);
+        };
+        verify_bundle(account, &bundle)
+            .map(Some)
+            .map_err(|e| e.to_string())
+    }
+}
diff --git a/extensions/components/src/lib.rs b/extensions/components/src/lib.rs
index 25ae825..d7cb449 100644
--- a/extensions/components/src/lib.rs
+++ b/extensions/components/src/lib.rs
@@ -3,7 +3,7 @@ mod delivery;
 mod storage;
 mod wakeup;
 
-pub use contact_registry::EphemeralRegistry;
+pub use contact_registry::ephemeral::EphemeralRegistry;
 pub use contact_registry::http::{HttpRegistry, HttpRegistryError};
 pub use delivery::*;
 pub use storage::*;