diff --git a/.github/workflows/proto-ci.yaml b/.github/workflows/proto-ci.yaml
new file mode 100644
index 0000000..881b2ba
--- /dev/null
+++ b/.github/workflows/proto-ci.yaml
@@ -0,0 +1,25 @@
+name: Protobuf CI
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - main
+    tags:
+      - "**"
+
+jobs:
+  fmt:
+    name: Format
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # pin@v4.1.7
+      - uses: bufbuild/buf-setup-action@35c243d7f2a909b1d4e40399b348a7fdab27d78d # pin@v1.34.0
+        with:
+          version: "1.34.0"
+          github_token: ${{ github.token }}
+
+      - name: Check Protobuf Format
+        run: buf format -d --exit-code
+
+
diff --git a/.github/workflows/rust-ci.yaml b/.github/workflows/rust-ci.yaml
new file mode 100644
index 0000000..adb5b4e
--- /dev/null
+++ b/.github/workflows/rust-ci.yaml
@@ -0,0 +1,58 @@
+name: Rust CI
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+      - main
+    tags:
+      - "**"
+
+jobs:
+  fmt:
+    name: Format
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # pin@v4.1.7
+
+      - name: Check Rust formatting
+        run: cargo fmt --check --all
+
+  clippy:
+    name: Lint
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # pin@v4.1.7
+      - name: Cache cargo dependencies
+        uses: Swatinem/rust-cache@23bce251a8cd2ffc3c1075eaa2367cf899916d84 # pin@v2.7.3
+      - name: Install Protoc
+        uses: arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b # pin@v3.0.0
+        with:
+          version: "24.1"
+
+      - name: Clippy lints
+        run: cargo clippy --all --all-features --all-targets --no-deps -- -D warnings
+
+  doc:
+    name: Docs
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # pin@v4.1.7
+      - name: Cache cargo dependencies
+        uses: Swatinem/rust-cache@23bce251a8cd2ffc3c1075eaa2367cf899916d84 # pin@v2.7.3
+      - name: Install Protoc
+        uses: arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b # pin@v3.0.0
+        with:
+          version: "24.1"
+
+      - name: Cargo Doc
+        run: cargo doc --all --all-features --no-deps --document-private-items
+
+  cargo-deny:
+    name: Licensing
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # pin@v3
+
+      - name: Check licenses and security advisories
+        uses: EmbarkStudios/cargo-deny-action@3f4a782664881cf5725d0ffd23969fcce89fd868 # pin@v1.6.3
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..effd049
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,15 @@
+# Rust stuff
+/target
+
+# Nix stuff
+/.direnv
+/result
+.envrc
+
+.DS_Store
+
+# IDE stuff
+.idea/
+
+# Allow developers to use python pre-commit locally
+/.pre-commit-config.yaml
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..1099912
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1097 @@
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+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e4246f76bdeff09eb48875a0fd3e2af6aada79d409d33011886d3e1581517d9"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b7b52767868a23d5bab768e390dc5f5c55825b6d30b86c844ff2dc7414044cc"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "852298e482cd67c356ddd9570386e2862b5673c85bd5f88df9ab6802b334c596"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ed94fce61571a4006852b7389a063ab983c02eb1bb37b47f8272ce92d06d9538"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bec47e5bfd1bff0eeaf6d8b485cc1074891a197ab4225d504cb7a1ab88b02bf0"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..fa15aad
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[workspace]
+resolver = "2"
+members = [
+	"rust"
+]
+
+[workspace.package]
+edition = "2021"
+license = "MIT OR (Apache-2.0 WITH LLVM-exception)"
+repository = "https://github.com/worldcoin/orb-relay-messages"
+rust-version = "1.79.0" # See rust-version.toml
diff --git a/buf.yaml b/buf.yaml
new file mode 100644
index 0000000..ba5ddf5
--- /dev/null
+++ b/buf.yaml
@@ -0,0 +1,3 @@
+version: v2
+modules:
+  - path: proto
diff --git a/deny.toml b/deny.toml
new file mode 100644
index 0000000..0843b6d
--- /dev/null
+++ b/deny.toml
@@ -0,0 +1,40 @@
+[graph]
+# Cargo deny will check dependencies via `--all-features`
+all-features = true
+
+[sources]
+unknown-registry = "deny"
+
+[licenses]
+version = 2
+# We want really high confidence when inferring licenses from text
+confidence-threshold = 1.0
+
+# List of explicitly allowed licenses
+# See https://spdx.org/licenses/ for list of possible licenses
+allow = [
+    "0BSD",
+    "Apache-2.0 WITH LLVM-exception",
+    "Apache-2.0",
+    "BSD-2-Clause",
+    "BSD-2-Clause-Patent",
+    "BSD-3-Clause",
+    "BSL-1.0",
+    "CC0-1.0",
+    "ISC",
+    "LicenseRef-ring", # See https://github.com/briansmith/ring/blob/95948b3977013aed16db92ae32e6b8384496a740/deny.toml#L12
+    "LicenseRef-wc-proprietary",
+    "MIT",
+    "MPL-2.0", # Although this is copyleft, it is scoped to modifying the original files
+    "Unicode-DFS-2016",
+    "Unlicense",
+    "Zlib",
+]
+
+# See https://github.com/briansmith/ring/blob/95948b3977013aed16db92ae32e6b8384496a740/deny.toml#L12
+[[licenses.clarify]]
+name = "ring"
+expression = "LicenseRef-ring"
+license-files = [
+    { path = "LICENSE", hash = 0xbd0eed23 },
+]
diff --git a/proto/config/backend.proto b/proto/config/backend.proto
new file mode 100644
index 0000000..99de813
--- /dev/null
+++ b/proto/config/backend.proto
@@ -0,0 +1,13 @@
+syntax = "proto3";
+
+package config;
+
+message OrbUpdateConfigRequest {
+  string orb_id = 1;
+  string config = 2;
+}
+
+message OrbUpdateConfigResponse {
+  string orb_id = 1;
+  bool success = 2;
+}
diff --git a/proto/config/orb.proto b/proto/config/orb.proto
new file mode 100644
index 0000000..b7da249
--- /dev/null
+++ b/proto/config/orb.proto
@@ -0,0 +1,7 @@
+syntax = "proto3";
+
+package config;
+
+message OrbReceiveConfigUpdate {
+  string config = 1;
+}
diff --git a/proto/relay.proto b/proto/relay.proto
new file mode 100644
index 0000000..1942381
--- /dev/null
+++ b/proto/relay.proto
@@ -0,0 +1,76 @@
+syntax = "proto3";
+
+package relay;
+
+import "config/backend.proto";
+import "config/orb.proto";
+import "self_serve/app.proto";
+import "self_serve/orb.proto";
+
+// Service Definitions
+service OrbService {
+  rpc OrbConnect(stream OrbEvent) returns (stream OrbCommand);
+}
+
+service AppService {
+  rpc AppConnect(stream AppEvent) returns (stream AppCommand);
+}
+
+service BackendService {
+  rpc RequestOrbUpdateConfig(config.OrbUpdateConfigRequest) returns (config.OrbUpdateConfigResponse);
+}
+
+message OrbConnectRequestEvent {
+  string orb_id = 1;
+}
+
+message AppConnectRequestEvent {
+  string app_id = 1;
+}
+
+// Command and Event Streams
+message OrbCommand {
+  oneof command {
+    selfserve.OrbStartSelfServeSignupCommand orb_start_self_serve_signup_command = 1;
+    config.OrbReceiveConfigUpdate orb_receive_config_update = 2;
+  }
+}
+
+message OrbEvent {
+  oneof event {
+    OrbConnectRequestEvent orb_connect_request_event = 1;
+    selfserve.OrbSelfServeSessionStartedEvent orb_self_serve_session_started_event = 2;
+    selfserve.OrbSignupStartedEvent orb_signup_started_event = 3;
+    selfserve.OrbSignupCompletedEvent orb_signup_completed_event = 4;
+  }
+}
+
+message AppCommand {
+  oneof command {
+    selfserve.AppReceiveQRCommand app_receive_qr_command = 1;
+    selfserve.AppConnectedToOrbCommand app_connected_to_orb_command = 2;
+    selfserve.NotifyAppSignupStartedCommand notify_app_signup_started_command = 3;
+    selfserve.AppReceiveSignupResultCommand app_receive_signup_result_command = 4;
+    selfserve.AppShowStartSignupButtonCommand app_show_start_signup_button_command = 5;
+  }
+}
+
+message AppEvent {
+  oneof event {
+    AppConnectRequestEvent app_connect_request_event = 1;
+    selfserve.AppRequestStartSelfServeFlowEvent app_request_start_self_serve_flow_event = 2;
+    selfserve.AppRequestStartSignupEvent app_request_start_signup_event = 3;
+  }
+}
+
+message BackendEvent {
+  oneof event {
+    config.OrbUpdateConfigRequest orb_update_config_request = 1;
+  }
+}
+
+message BackendCommand {
+  oneof command {
+    config.OrbUpdateConfigResponse orb_update_config_response = 1;
+  }
+}
diff --git a/proto/self_serve/app.proto b/proto/self_serve/app.proto
new file mode 100644
index 0000000..4d0dba8
--- /dev/null
+++ b/proto/self_serve/app.proto
@@ -0,0 +1,25 @@
+syntax = "proto3";
+
+package selfserve;
+
+message AppReceiveQRCommand {
+  string qr_code = 1;
+}
+
+message AppConnectedToOrbCommand {
+  string orb_id = 1;
+}
+
+message AppShowStartSignupButtonCommand {}
+
+message NotifyAppSignupStartedCommand {}
+
+message AppReceiveSignupResultCommand {
+  bool success = 1;
+}
+
+message AppRequestStartSelfServeFlowEvent {}
+
+message AppRequestStartSignupEvent {
+  string orb_id = 1;
+}
diff --git a/proto/self_serve/backend.proto b/proto/self_serve/backend.proto
new file mode 100644
index 0000000..4a22533
--- /dev/null
+++ b/proto/self_serve/backend.proto
@@ -0,0 +1,5 @@
+syntax = "proto3";
+
+package selfserve;
+
+// Backend-specific messages would go here
diff --git a/proto/self_serve/orb.proto b/proto/self_serve/orb.proto
new file mode 100644
index 0000000..1c18645
--- /dev/null
+++ b/proto/self_serve/orb.proto
@@ -0,0 +1,18 @@
+syntax = "proto3";
+
+package selfserve;
+
+message OrbStartSelfServeSignupCommand {}
+
+message OrbSelfServeSessionStartedEvent {
+  string app_id = 1;
+}
+
+message OrbSignupStartedEvent {
+  string app_id = 1;
+}
+
+message OrbSignupCompletedEvent {
+  string app_id = 1;
+  bool success = 2;
+}
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..bc82704
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,5 @@
+[toolchain]
+channel = "1.79.0" # See Cargo.toml
+targets = ["aarch64-unknown-linux-gnu", "x86_64-unknown-linux-gnu", "aarch64-apple-darwin"]
+profile = "minimal"
+components = ["clippy", "llvm-tools-preview", "rustfmt", "rust-src", "rust-analyzer", "cargo", "rustc"]
diff --git a/rust/Cargo.toml b/rust/Cargo.toml
new file mode 100644
index 0000000..677c326
--- /dev/null
+++ b/rust/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "orb-relay-messages"
+version = "0.0.0"
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+rust-version.workspace = true
+
+[features]
+client = []
+server = []
+
+[dependencies]
+prost = "0.12.6"
+tonic = "0.11.0"
+
+[build-dependencies]
+tonic-build = "0.11.0"
diff --git a/rust/build.rs b/rust/build.rs
new file mode 100644
index 0000000..d10aa52
--- /dev/null
+++ b/rust/build.rs
@@ -0,0 +1,20 @@
+fn main() {
+    assert!(
+        cfg!(any(feature = "client", feature = "server")),
+        "must specify at least one of the `client` or `server` features"
+    );
+    tonic_build::configure()
+        .build_client(cfg!(feature = "client"))
+        .build_server(cfg!(feature = "server"))
+        .compile(
+            &[
+                "../proto/relay.proto",
+                "../proto/self_serve/app.proto",
+                "../proto/self_serve/orb.proto",
+                "../proto/config/backend.proto",
+                "../proto/config/orb.proto",
+            ],
+            &["../proto"],
+        )
+        .unwrap();
+}
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
new file mode 100644
index 0000000..2ef1122
--- /dev/null
+++ b/rust/src/lib.rs
@@ -0,0 +1,13 @@
+pub use ::prost;
+
+pub mod relay {
+    tonic::include_proto!("relay");
+}
+
+pub mod selfserve {
+    tonic::include_proto!("selfserve");
+}
+
+pub mod config {
+    tonic::include_proto!("config");
+}
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..b98e7bb
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1,2 @@
+# Consistent with the orb-software repo
+max_width = 88