diff --git a/nim_chat_poc.nimble b/nim_chat_poc.nimble
index 6f40892..a087563 100644
--- a/nim_chat_poc.nimble
+++ b/nim_chat_poc.nimble
@@ -26,4 +26,4 @@ requires "nimchacha20poly1305" # TODO: remove
 requires "confutils >= 0.1.0"
 requires "eth >= 0.8.0"
 requires "regex >= 0.26.3"
-requires "web3 >= 0.7.0"
\ No newline at end of file
+requires "web3 >= 0.7.0"
diff --git a/protos/common_frames.proto b/protos/common_frames.proto
new file mode 100644
index 0000000..453c00f
--- /dev/null
+++ b/protos/common_frames.proto
@@ -0,0 +1,9 @@
+syntax = "proto3";
+
+package umbra.common_frames;
+
+message ContentFrame {
+    uint32 domain = 1;
+    uint32 tag = 2;
+    bytes bytes = 3;
+}
diff --git a/protos/conversations/group_v1.proto b/protos/conversations/group_v1.proto
new file mode 100644
index 0000000..34d7ca2
--- /dev/null
+++ b/protos/conversations/group_v1.proto
@@ -0,0 +1,28 @@
+syntax = "proto3";
+
+package umbra.convos.group_v1;
+
+import "base.proto";
+import "common_frames.proto";
+
+
+
+message ConversationInvite_GroupV1 {
+    repeated string participants = 1;
+}
+
+
+
+message GroupV1Frame {
+    // SDS like information: Message ID and channel_id extracted for utility
+    string message_id = 2;                   
+    string channel_id = 3;                      // Channel_id is associated with a set of participants
+                                                // This conflicts with conversation based encryption, 
+                                                // need to ensure the derived sender is a valid participant                                 
+    base.ReliabilityInfo reliability_info = 10;
+
+	oneof frame_type {
+		common_frames.ContentFrame content = 100;
+        // ...
+	}
+}
diff --git a/protos/conversations/private_v1.proto b/protos/conversations/private_v1.proto
new file mode 100644
index 0000000..43a6a73
--- /dev/null
+++ b/protos/conversations/private_v1.proto
@@ -0,0 +1,22 @@
+syntax = "proto3";
+
+package umbra.convos.private_v1;
+
+import "common_frames.proto";
+
+
+
+
+message Placeholder {
+    uint32 counter = 1;
+}
+
+message PrivateV1Frame {                 
+    string conversation_id = 1;                  
+
+	oneof frame_type {
+		common_frames.ContentFrame content = 10;
+        Placeholder placeholder = 11;
+        // ....
+	}
+}
diff --git a/protos/encryption.proto b/protos/encryption.proto
new file mode 100644
index 0000000..a579382
--- /dev/null
+++ b/protos/encryption.proto
@@ -0,0 +1,24 @@
+syntax = "proto3";
+
+package umbra.encryption;
+
+
+// TODO: This also encompasses plaintexts, is there a better name?
+// Alternatives: ???
+message EncryptedPayload {
+
+    oneof encryption {
+        encryption.Plaintext plaintext = 1;
+		encryption.Ecies ecies = 2;
+    }
+}
+
+message Plaintext {
+    bytes payload=1;
+}
+
+message Ecies {
+    bytes encrypted_bytes=1;
+    bytes ephemeral_pubkey = 2;
+    bytes tag = 3;
+}
diff --git a/protos/envelope.proto b/protos/envelope.proto
new file mode 100644
index 0000000..0b0d2ea
--- /dev/null
+++ b/protos/envelope.proto
@@ -0,0 +1,16 @@
+syntax = "proto3";
+
+package umbra.envelope;
+
+
+///////////////////////////////////////////////////////////////////////////////
+// Payload Framing Messages
+///////////////////////////////////////////////////////////////////////////////
+
+message UmbraEnvelopeV1 {
+    
+    string conversation_hint = 1;
+    uint64 salt = 2;           
+    
+    bytes payload = 5;
+}
diff --git a/protos/inbox.proto b/protos/inbox.proto
new file mode 100644
index 0000000..ad4fed4
--- /dev/null
+++ b/protos/inbox.proto
@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+package umbra.inbox;
+
+import "invite.proto";
+
+message InboxV1Frame {
+    string recipient = 1;
+    oneof frame_type {
+        invite.InvitePrivateV1 invite_private_v1 = 10;
+    }
+}
diff --git a/protos/invite.proto b/protos/invite.proto
new file mode 100644
index 0000000..c94b442
--- /dev/null
+++ b/protos/invite.proto
@@ -0,0 +1,7 @@
+syntax = "proto3";
+
+package umbra.invite;
+
+message InvitePrivateV1 {
+    repeated string participants = 1;
+}
diff --git a/protos/reliability.proto b/protos/reliability.proto
new file mode 100644
index 0000000..3c433c3
--- /dev/null
+++ b/protos/reliability.proto
@@ -0,0 +1,23 @@
+syntax = "proto3";
+
+package umbra.reliability;
+
+///////////////////////////////////////////////////////////////////////////////
+// SDS Payloads
+///////////////////////////////////////////////////////////////////////////////
+
+message HistoryEntry {
+    string message_id = 1;        // Unique identifier of the SDS message, as defined in `Message`
+    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 ReliablePayload {
+      string message_id = 2;      
+      string channel_id = 3;  
+      int32 lamport_timestamp = 10;    
+      repeated HistoryEntry causal_history = 11;   
+      bytes bloom_filter = 12; 
+      // Optional field causes errors in nim protobuf generation. Removing for now as optional is implied anways.
+      bytes content = 20;                           
+  }
diff --git a/src/client.nim b/src/client.nim
new file mode 100644
index 0000000..0b5f246
--- /dev/null
+++ b/src/client.nim
@@ -0,0 +1,175 @@
+import tables
+import identity
+import crypto
+import proto_types
+import std/times
+import utils
+import dev
+import inbox
+
+import conversations/private_v1
+
+import secp256k1
+import chronicles
+
+type KeyEntry* = object
+  keytype: string
+  keypair: SkKeyPair
+  timestamp: int64
+
+
+type SupportedConvoTypes* = Inbox | PrivateV1
+
+type
+  ConvoType* = enum
+    InboxV1Type, PrivateV1Type
+
+  ConvoWrapper* = object
+    case convo_type*: ConvoType
+    of InboxV1Type:
+      inboxV1*: Inbox
+    of PrivateV1Type:
+      privateV1*: PrivateV1
+
+
+type
+  Client* = object
+    ident: Identity
+    key_store: Table[string, KeyEntry]         # Keyed by HexEncoded Public Key
+    conversations: Table[string, ConvoWrapper] # Keyed by conversation ID
+
+
+proc process_invite*(self: Client, invite: InvitePrivateV1)
+
+
+#################################################
+# Constructors
+#################################################
+
+proc initClient*(name: string): Client =
+
+
+  var c = Client(ident: createIdentity(name),
+                 key_store: initTable[string, KeyEntry](),
+                 conversations: initTable[string, ConvoWrapper]())
+
+  let default_inbox = initInbox(c.ident.getAddr(), proc(
+        x: InvitePrivateV1) = c.process_invite(x))
+
+  c.conversations[conversation_id_for(c.ident.getPubkey(
+    ))] = ConvoWrapper(convo_type: InboxV1Type, inboxV1: default_inbox)
+
+  result = c
+
+
+#################################################
+# Parameter Access
+#################################################
+
+proc getClientAddr*(self: Client): string =
+  result = self.ident.getAddr()
+
+proc default_inbox_conversation_id*(self: Client): string =
+  ## Returns the default inbox address for the client.
+  result = conversation_id_for(self.ident.getPubkey())
+
+#################################################
+# Methods
+#################################################
+
+# proc addConversation*(c: var Client, convo: Conversation) =
+#   if not c.conversations.hasKey(convo.getConvoId()):
+#     c.conversations[convo.getConvoId()] = convo
+#   else:
+#     echo "Conversation with ID ", convo.getConvoId(), " already exists."
+
+
+proc createIntroBundle*(self: var Client): IntroBundle =
+  ## Generates an IntroBundle for the client, which includes
+  ## the required information to send a message.
+
+  # Create Ephemeral keypair, save it in the key store
+  let ephemeral_keypair = generate_keypair()
+  self.key_store[ephemeral_keypair.pubkey.toHexCompressed()] = KeyEntry(
+    keytype: "ephemeral",
+    keypair: ephemeral_keypair,
+    timestamp: getTime().toUnix(),
+  )
+
+  result = IntroBundle(
+    ident: @(self.ident.getPubkey().toRawCompressed()),
+    ephemeral: @(ephemeral_keypair.pubkey.toRawCompressed()),
+  )
+
+proc createPrivateConvo*(self: Client, intro_bundle: IntroBundle): TransportMessage =
+  ## Creates a private conversation with the given Invitebundle.
+
+
+
+  let res_pubkey = SkPublicKey.fromRaw(intro_bundle.ident)
+  if res_pubkey.isErr:
+    raise newException(ValueError, "Invalid public key in intro bundle.")
+  let dest_pubkey = res_pubkey.get()
+  let convo_id = "/convo/inbox/" & dest_pubkey.getAddr()
+
+  let dst_convo_topic = topic_inbox(dest_pubkey.get_addr())
+
+  let invite = InvitePrivateV1(
+    participants: @[self.ident.getAddr(), dest_pubkey.get_addr()],
+  )
+  let env = wrap_env(encrypt(InboxV1Frame(invite_private_v1: invite,
+      recipient: "")), convo_id)
+
+  # Create a new conversation
+  # let convo_id = self.ident.getAddr() & "-" & raya_bundle.ident.toHexCompressed()
+  # let new_convo = Conversation(id: convo_id, participants: @[self.ident,
+  #     Identity(name: "Raya", keypair: SkKeyPair.fromRawCompressed(
+  #     raya_bundle.ident))])
+
+  # Add the conversation to the client's store
+  # self.addConversation(new_convo)
+
+  # Return the invite (or any other relevant data)
+  # return new_convo
+
+  return sendTo(dst_convo_topic, encode(env))
+
+proc get_conversation(self: Client,
+    conversation_hint: string): Result[Option[ConvoWrapper], string] =
+
+  # TODO: Implementing Hinting
+  if not self.conversations.hasKey(conversation_hint):
+    ok(none(ConvoWrapper))
+  else:
+    ok(some(self.conversations[conversation_hint]))
+
+
+proc recv*(self: var Client, transport_message: TransportMessage): seq[
+    TransportMessage] =
+  ## Reveives a incomming payload, decodes it, and processes it.
+  let res_env = decode(transport_message.payload, UmbraEnvelopeV1)
+  if res_env.isErr:
+    raise newException(ValueError, "Failed to decode UmbraEnvelopeV1: " & res_env.error)
+  let env = res_env.get()
+
+  let res_convo = self.get_conversation(env.conversation_hint)
+  if res_convo.isErr:
+    raise newException(ValueError, "Failed to get conversation: " &
+        res_convo.error)
+
+  let convo = res_convo.get()
+  if not convo.isSome:
+    debug "No conversation found", hint = env.conversation_hint
+    return
+
+  let inbox = convo.get().inboxV1
+
+  let res = inbox.handle_incomming_frame(transport_message.topic, env.payload)
+  if res.isErr:
+    warn "Failed to handle incoming frame: ", error = res.error
+  return @[]
+
+
+
+proc process_invite*(self: Client, invite: InvitePrivateV1) =
+  debug "Callback Invoked", invite = invite
diff --git a/src/conversations/private_v1.nim b/src/conversations/private_v1.nim
new file mode 100644
index 0000000..93657c3
--- /dev/null
+++ b/src/conversations/private_v1.nim
@@ -0,0 +1,4 @@
+type
+  PrivateV1* = object
+    # Placeholder for PrivateV1 conversation type
+    name*: string
diff --git a/src/crypto.nim b/src/crypto.nim
new file mode 100644
index 0000000..da043b7
--- /dev/null
+++ b/src/crypto.nim
@@ -0,0 +1,33 @@
+import proto_types
+
+import secp256k1
+import std/[sysrand]
+export secp256k1
+
+
+type KeyPair* = SkKeyPair
+
+
+
+proc encrypt_plain*[T: EncryptableTypes](frame: T): EncryptedPayload =
+  return EncryptedPayload(
+    plaintext: Plaintext(payload: encode(frame)),
+  )
+
+proc decrypt_plain*[T: EncryptableTypes](ciphertext: Plaintext, t: typedesc[
+    T]): Result[T, string] =
+
+  let obj = decode(ciphertext.payload, T)
+  if obj.isErr:
+    return err("Protobuf decode failed: " & obj.error)
+
+  result = ok(obj.get())
+
+proc generate_keypair*(): KeyPair =
+  var rng: Rng = urandom
+  let res = SkKeyPair.random(rng)
+  if res.isErr:
+    raise newException(ValueError, "Failed to generate keypair: ")
+
+  result = res.get()
+
diff --git a/src/dev.nim b/src/dev.nim
new file mode 100644
index 0000000..a9b767e
--- /dev/null
+++ b/src/dev.nim
@@ -0,0 +1,6 @@
+## Utilties for development and debugging
+
+proc dir*[T](obj: T) =
+  echo "Object of type: ", T
+  for name, value in fieldPairs(obj):
+    echo "  ", name, ": ", value
diff --git a/src/identity.nim b/src/identity.nim
new file mode 100644
index 0000000..c30d8b1
--- /dev/null
+++ b/src/identity.nim
@@ -0,0 +1,30 @@
+
+import crypto
+import utils
+
+
+type
+  Identity* = object
+    name: string
+    keypair: KeyPair
+
+
+#################################################
+# Constructors
+#################################################
+
+proc createIdentity*(name: string): Identity =
+  let keypair = generate_keypair()
+  result = Identity(name: name, keypair: keypair)
+
+
+#################################################
+# Parameter Access
+#################################################
+
+proc getAddr*(self: Identity): string =
+  result = get_addr(self.keypair.pubkey)
+
+
+proc getPubkey*(self: Identity): SkPublicKey =
+  result = self.keypair.pubkey
diff --git a/src/inbox.nim b/src/inbox.nim
new file mode 100644
index 0000000..9479e25
--- /dev/null
+++ b/src/inbox.nim
@@ -0,0 +1,65 @@
+import crypto
+import proto_types
+import utils
+import dev
+
+import chronicles
+
+
+type InviteCallback* = proc(invite: InvitePrivateV1): void
+
+
+type
+  Inbox* = object
+    inbox_addr: string
+    invite_callback: InviteCallback
+
+proc initInbox*(inbox_addr: string, invite_callback: InviteCallback): Inbox =
+  ## Initializes an Inbox object with the given address and invite callback.
+  return Inbox(inbox_addr: inbox_addr, invite_callback: invite_callback)
+
+
+proc encrypt*(frame: InboxV1Frame): EncryptedPayload =
+  return encrypt_plain(frame)
+
+proc wrap_env*(payload: EncryptedPayload, convo_id: string): UmbraEnvelopeV1 =
+  let bytes = encode(payload)
+  let salt = generateSalt()
+
+  return UmbraEnvelopeV1(
+    payload: bytes,
+    salt: salt,
+    conversation_hint: convo_id,
+  )
+
+proc conversation_id_for*(pubkey: SkPublicKey): string =
+  ## Generates a conversation ID based on the public key.
+  return "/convo/inbox/" & pubkey.get_addr()
+
+# TODO derive this from instance of Inbox
+proc topic_inbox*(client_addr: string): string =
+  return "/inbox/v1/" & client_addr
+
+
+proc handle_incomming_frame*(self: Inbox, topic: string, bytes: seq[
+    byte]): Result[int, string] =
+  # TODO: Can this fail?
+  let res = decode(bytes, EncryptedPayload)
+  if res.isErr:
+    return err("Failed to decode payload: " & res.error)
+
+  let encbytes = res.get()
+
+  # NOTE! in nim_protobuf_serializaiton OneOf fields are not exclusive, and all fields are default initialized.
+  if encbytes.plaintext == Plaintext():
+    return err("Incorrect Encryption Type")
+
+  let res_frame = decrypt_plain(encbytes.plaintext, InboxV1Frame)
+  if res_frame.isErr:
+    return err("Failed to decrypt frame: " & res_frame.error)
+  let frame = res_frame.get()
+
+  self.invite_callback(frame.invite_private_v1)
+  ok(0)
+
+
diff --git a/src/nim_chat_poc.nim b/src/nim_chat_poc.nim
index 56ba516..5b315d3 100644
--- a/src/nim_chat_poc.nim
+++ b/src/nim_chat_poc.nim
@@ -1,3 +1,4 @@
+
 import
   chronicles,
   chronos,
@@ -28,3 +29,39 @@ proc main(): Future[void] {.async.} =
 
 when isMainModule:
   waitFor main()
+
+# import client
+# import chronicles
+# import proto_types
+
+# proc log(transport_message: TransportMessage) =
+#   ## Log the transport message
+#   info "Transport Message:", topic = transport_message.topic,
+#       payload = transport_message.payload
+
+# proc demo() =
+
+#   # Initalize Clients
+#   var saro = initClient("Saro")
+#   var raya = initClient("Raya")
+
+#   # # Exchange Contact Info
+#   let raya_bundle = raya.createIntroBundle()
+
+#   # Create Conversation
+#   let invite = saro.createPrivateConvo(raya_bundle)
+#   invite.log()
+#   let msgs = raya.recv(invite)
+
+#   # raya.convos()[0].sendText("Hello Saro, this is Raya!")
+
+
+# when isMainModule:
+#   echo("Starting ChatPOC...")
+
+#   try:
+#     demo()
+#   except Exception as e:
+#     error "Crashed ", error = e.msg
+
+#   echo("Finished...")
diff --git a/src/proto_types.nim b/src/proto_types.nim
new file mode 100644
index 0000000..bb32290
--- /dev/null
+++ b/src/proto_types.nim
@@ -0,0 +1,57 @@
+# Can this be an external package? It would be preferable to have these types
+# easy to import and use.
+
+import protobuf_serialization # This import is needed or th macro will not work
+import protobuf_serialization/proto_parser
+import results
+
+export protobuf_serialization
+
+import_proto3 "../protos/inbox.proto"
+# import_proto3 "../protos/invite.proto"    // Import3 follows protobuf includes so this will result in a redefinition error
+import_proto3 "../protos/encryption.proto"
+import_proto3 "../protos/envelope.proto"
+
+type EncryptableTypes = InboxV1Frame | EncryptedPayload
+
+export EncryptedPayload
+export InboxV1Frame
+
+export EncryptableTypes
+
+
+
+
+proc encode*(frame: object): seq[byte] =
+  ## Encodes the frame into a byte sequence using Protobuf serialization.
+  result = Protobuf.encode(frame)
+
+
+proc decode*[T: object] (bytes: seq[byte], proto: typedesc[
+    T]): Result[T, string] =
+  ## Encodes the frame into a byte sequence using Protobuf serialization.
+
+  try:
+    result = ok(Protobuf.decode(bytes, proto))
+  except ProtobufError as e:
+    result = err("Failed to decode payload: " & e.msg)
+
+type
+  IntroBundle {.proto3.} = object
+    ident* {.fieldNumber: 1.}: seq[byte]
+    ephemeral* {.fieldNumber: 2.}: seq[byte]
+
+
+export IntroBundle
+
+
+type
+  TransportMessage {.proto3.} = object
+    topic* {.fieldNumber: 1.}: string
+    payload* {.fieldNumber: 2.}: seq[byte]
+
+
+proc sendTo*(topic: string, payload: seq[byte]): TransportMessage =
+  result = TransportMessage(topic: topic, payload: payload)
+
+export TransportMessage
diff --git a/src/utils.nim b/src/utils.nim
index 3d8ae4b..1456452 100644
--- a/src/utils.nim
+++ b/src/utils.nim
@@ -1,6 +1,18 @@
-import std/times
 import waku/waku_core
-
+import std/[random, times]
+import crypto
+import blake2
 
 proc getTimestamp*(): Timestamp =
     result = waku_core.getNanosecondTime(getTime().toUnix())
+
+proc generateSalt*(): uint64 =
+    randomize()
+    result = 0
+    for i in 0 ..< 8:
+        result = result or (uint64(rand(255)) shl (i * 8))
+
+proc get_addr*(pubkey: SkPublicKey): string =
+    # TODO: Needs Spec
+    result = getBlake2b(pubkey.toHexCompressed(), 4, "")
+