diff --git a/.gitignore b/.gitignore
index 24f5980..bc7b031 100644
--- a/.gitignore
+++ b/.gitignore
@@ -37,6 +37,9 @@ nimble.paths
 /metrics/prometheus
 /metrics/waku-sim-all-nodes-grafana-dashboard.json
 
+# Simulation runtime state (logs, keystores, configs generated per run)
+/simulations/**/.sim_state/
+
 *.log
 /package-lock.json
 /package.json
diff --git a/scripts/run_in_docker.sh b/scripts/run_in_docker.sh
new file mode 100755
index 0000000..504b557
--- /dev/null
+++ b/scripts/run_in_docker.sh
@@ -0,0 +1,121 @@
+#!/usr/bin/env bash
+# Run the mix+LEZ chat simulation inside a Docker container (Linux aarch64).
+#
+# The Docker image pre-builds EVERYTHING: LEZ modules, sequencer, logoscore,
+# liblogoschat, chat_module_plugin. Each sim run only clones the repo (for
+# scripts + configs), symlinks pre-built artifacts, and runs the simulation.
+#
+# First run: ~60 min (one-time docker build)
+# Subsequent runs: ~5 min (clone + submodule init + sim)
+#
+# Prerequisites: Docker Desktop running.
+#
+# Usage:
+#   bash scripts/run_in_docker.sh
+#   BRANCH=my-branch bash scripts/run_in_docker.sh  # test a different branch
+#
+# Environment variables:
+#   BRANCH              — git branch to clone (default: feat/logos-delivery)
+#   REPO_URL            — git repo URL
+#   GUEST_BINARIES_DIR  — path to pre-built guest .bin files (auto-detected)
+#   REBUILD_IMAGE       — set to 1 to force image rebuild
+#   SIM_*               — simulation parameters, passed through to run_simulation.sh
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
+DOCKERFILE="$ROOT/.github/Dockerfile.sim"
+IMAGE_NAME="logos-chat-sim"
+CONTAINER_NAME="logos-chat-sim-run"
+BRANCH="${BRANCH:-feat/logos-delivery}"
+REPO_URL="${REPO_URL:-https://github.com/adklempner/logos-chat.git}"
+
+# Build image if it doesn't exist or REBUILD_IMAGE=1
+if [ "${REBUILD_IMAGE:-0}" = "1" ] || ! docker image inspect "$IMAGE_NAME" >/dev/null 2>&1; then
+    echo "=== Building Docker image (one-time — ~60 min) ==="
+    docker build -t "$IMAGE_NAME" -f "$DOCKERFILE" "$ROOT"
+else
+    echo "=== Docker image cached ==="
+fi
+
+docker rm -f "$CONTAINER_NAME" 2>/dev/null || true
+trap 'echo "=== Rescuing logs ==="; docker cp "$CONTAINER_NAME:/root/logos-chat/simulations/mix_lez_chat/.sim_state" ./docker-sim-logs 2>/dev/null || true; docker rm -f "$CONTAINER_NAME" 2>/dev/null || true' EXIT
+
+echo "=== Starting container ==="
+docker run --rm -d --name "$CONTAINER_NAME" "$IMAGE_NAME" tail -f /dev/null
+
+# Stage guest binaries
+GUEST_REL="vendor/logos-lez-rln/lez-rln/methods/guest/target/riscv32im-risc0-zkvm-elf/docker"
+GUEST_SRC=""
+for candidate in \
+    "${GUEST_BINARIES_DIR:-}" \
+    "$ROOT/$GUEST_REL" \
+    "$HOME/Waku/Logos/logos-chat/$GUEST_REL" \
+    "../logos-chat/$GUEST_REL"; do
+    [ -f "$candidate/rln_registration.bin" ] 2>/dev/null && GUEST_SRC="$candidate" && break
+done
+if [ -n "$GUEST_SRC" ]; then
+    echo "=== Staging guest binaries ==="
+    docker exec "$CONTAINER_NAME" mkdir -p "/tmp/guest-bins"
+    docker cp "$GUEST_SRC/rln_registration.bin" "$CONTAINER_NAME:/tmp/guest-bins/"
+    docker cp "$GUEST_SRC/incremental_merkle_tree.bin" "$CONTAINER_NAME:/tmp/guest-bins/"
+fi
+
+# Collect SIM_* env vars
+SIM_ENVS=""
+for var in $(env | grep '^SIM_' | cut -d= -f1); do
+    SIM_ENVS="$SIM_ENVS export $var='${!var}';"
+done
+
+echo "=== Running simulation ==="
+docker exec "$CONTAINER_NAME" bash -c "
+$SIM_ENVS
+export RISC0_DEV_MODE=1
+
+# Clone repo (just for scripts + configs, not for building)
+cd /root
+rm -rf logos-chat
+git clone --depth 1 -b $BRANCH $REPO_URL
+cd logos-chat
+# Only init top-level submodules + logos-lez-rln selectively (for sim script paths)
+git submodule update --init --depth 1
+(cd vendor/logos-lez-rln && git submodule update --init --depth 1 lssa logos-delivery logos-delivery-module logos-execution-zone-module)
+(cd vendor/logos-lez-rln/logos-delivery-module && git submodule update --init --depth 1 vendor/logos-delivery)
+
+# Symlink ALL pre-built artifacts from the Docker image
+LEZ_DIR=vendor/logos-lez-rln
+ln -sf /root/lez-modules/result-rln \$LEZ_DIR/logos-rln-module/result-rln
+ln -sf /root/lez-modules/result-wallet \$LEZ_DIR/logos-rln-module/result-wallet
+mkdir -p \$LEZ_DIR/logos-delivery-module/build_plugin
+cp -r /root/lez-modules/delivery-plugin \$LEZ_DIR/logos-delivery-module/build_plugin/modules
+mkdir -p \$LEZ_DIR/logos-delivery-module/vendor/logos-delivery/build
+cp /root/lez-modules/delivery-build/* \$LEZ_DIR/logos-delivery-module/vendor/logos-delivery/build/ 2>/dev/null || true
+# Sequencer is built from source at runtime (pre-built crashes in risc0 dev prover).
+# Reuse cargo target cache from image to speed up (~30s vs ~2min).
+ln -sf /root/lez-modules/lssa-target-cache \$LEZ_DIR/lssa/target
+mkdir -p \$LEZ_DIR/lez-rln/target/debug
+cp /root/lez-modules/run_setup \$LEZ_DIR/lez-rln/target/debug/
+mkdir -p build
+cp /root/lez-modules/liblogoschat.so build/
+
+# Restore guest binaries
+GUEST_DIR=\"\$LEZ_DIR/lez-rln/methods/guest/target/riscv32im-risc0-zkvm-elf/docker\"
+if [ -f /tmp/guest-bins/rln_registration.bin ]; then
+    mkdir -p \"\$GUEST_DIR\"
+    cp /tmp/guest-bins/*.bin \"\$GUEST_DIR/\"
+fi
+
+# Chat module — symlink from pre-built in image
+ln -sf /root/lez-modules/chat-module-result /root/logos-chat-module/result 2>/dev/null || \
+    (mkdir -p /root/logos-chat-module && ln -sf /root/lez-modules/chat-module-result /root/logos-chat-module/result)
+
+# Set env vars for sim
+export LOGOSCORE=\"/root/lez-modules/logoscore-result/bin/logoscore\"
+CLANG_SO=\$(find /nix/store -maxdepth 3 -name 'libclang.so' 2>/dev/null | head -1 || true)
+[ -n \"\$CLANG_SO\" ] && export LIBCLANG_PATH=\$(dirname \"\$CLANG_SO\")
+
+bash simulations/mix_lez_chat/run_simulation.sh --fresh
+"
+
+echo "=== Done ==="
+# Container cleanup handled by EXIT trap (which also rescues logs on failure)
diff --git a/simulations/mix_lez_chat/README.md b/simulations/mix_lez_chat/README.md
new file mode 100644
index 0000000..7a08380
--- /dev/null
+++ b/simulations/mix_lez_chat/README.md
@@ -0,0 +1,162 @@
+# Mix + LEZ RLN Chat Simulation
+
+End-to-end private chat between two `logos-chat-module` clients over a 4-node mix network with LEZ-backed RLN spam protection against a local LEZ sequencer.
+
+Two logoscore instances (sender + receiver) load `chat_module` and establish an X3DH key agreement via an out-of-band intro bundle, then exchange double-ratchet-encrypted messages routed through 3-hop Sphinx onion routes with per-hop RLN proof generation and verification. Node 0 mounts the `rln_gifter` service; nodes 1-3 and both chat clients register RLN memberships on-chain via the gifter protocol. The chat clients run `mix: true, relay: false, filter: true` — the sender publishes via `lightpushPublish(mixify=true)`, the mix exit node verifies the RLN proof before fanning out via gossipsub relay to the shard, and the receiver consumes the message via a Waku filter subscription on one of the mix nodes.
+
+## Architecture
+
+```
+logoscore (per mix node)                    logoscore (per chat client)
+├── wallet_module (LEZ wallet)              ├── wallet_module (LEZ wallet)
+├── liblogos_rln_module (RLN proofs)        ├── liblogos_rln_module (RLN proofs)
+└── delivery_module (Waku mix relay)        └── chat_module (logos-chat-module)
+    ├── liblogosdelivery.so                     ├── chat_module_plugin.so
+    └── mix + relay + filter + gifter           └── liblogoschat.so
+                                                    └── mix client + filter + gifter client
+```
+
+Node 0 runs the RLN gifter service. Nodes 1-3 register via gifter on startup. Chat clients also register via gifter when `startChat()` runs.
+
+## Quick start
+
+**Prereqs:** nix (with flakes), Docker (for guest zkVM binaries), cargo-risczero, SSH access to GitHub.
+
+**Run from scratch:**
+
+```bash
+git clone -b feat/logos-delivery git@github.com:adklempner/logos-chat.git
+cd logos-chat && bash simulations/mix_lez_chat/setup_and_run.sh
+```
+
+**Re-run (after initial build):**
+
+```bash
+bash simulations/mix_lez_chat/run_simulation.sh --fresh
+```
+
+Pass = **ALL 15 CHECKS PASSED**.
+
+## Configuration
+
+Override via environment variables:
+
+| Variable | Default | Description |
+|---|---|---|
+| `SIM_NUM_NODES` | `4` | Number of mix relay nodes |
+| `SIM_BASE_TCP_PORT` | `60001` | First node's TCP port (increments per node) |
+| `SIM_BASE_DISC_PORT` | `9001` | First node's discv5 UDP port (increments per node) |
+| `SIM_CLUSTER_ID` | `99` | Waku cluster ID |
+| `SIM_LOG_LEVEL` | `INFO` | Node log level (TRACE, DEBUG, INFO, WARN, ERROR) |
+| `SIM_CHAT_RECV_PORT` | `60010` | Chat receiver TCP port |
+| `SIM_CHAT_SEND_PORT` | `60011` | Chat sender TCP port |
+| `SIM_KADEMLIA_MIN_WAIT` | `30` | Minimum seconds to wait for kademlia propagation |
+| `SIM_RECEIVER_MIN_WAIT` | `15` | Minimum seconds to wait for receiver to join mix |
+| `SIM_DELIVERY_TIMEOUT` | `120` | Max seconds to wait for message delivery |
+
+Example — fast iteration with verbose logging:
+
+```bash
+SIM_LOG_LEVEL=TRACE SIM_KADEMLIA_MIN_WAIT=10 SIM_RECEIVER_MIN_WAIT=5 \
+  bash simulations/mix_lez_chat/run_simulation.sh --fresh
+```
+
+## `--fresh` behavior
+
+When `--fresh` is passed:
+- Kills all existing `logos_host` processes
+- Cleans `/tmp/logos_*` Qt RemoteObjects sockets
+- Removes `.sim_state/` directory
+- Removes sequencer state (`rocksdb/`, `bedrock_signing_key`)
+- Rebuilds and restarts the sequencer
+- Redeploys RLN programs via `run_setup`
+
+Without `--fresh`, reuses existing sequencer if port 3040 is already bound.
+
+## Checks (15 total)
+
+| Category | Check | What it verifies |
+|---|---|---|
+| Mix nodes (4) | Node N mounted mix | Mix protocol handler registered |
+| RLN gifter | Node 0 gifter service mounted | `/logos/rln-gifter/1.0.0` protocol handler |
+| LEZ RLN | LEZ root polling active | Nodes polling valid Merkle roots from LEZ |
+| Chat module (4) | Receiver/Sender initialized | `chatInitResult` event fired |
+| | Receiver/Sender started | `Waku client started` + `chatStartResult` |
+| | Receiver/Sender mounted mix+LEZ | Mix protocol + LEZ callbacks wired |
+| | Receiver created intro bundle | X3DH pre-key bundle generated |
+| Message exchange (2) | Sender sent message | `chatNewPrivateConversationResult` |
+| | Receiver received message | `chatNewMessage` via filter subscription |
+
+## Troubleshooting
+
+**"Sequencer failed to start"** — port 3040 already in use:
+```bash
+kill $(lsof -ti tcp:3040) && bash simulations/mix_lez_chat/run_simulation.sh --fresh
+```
+
+**"run_setup failed" / "Timeout waiting for account"** — stale guest binaries or wallet state:
+```bash
+rm -rf vendor/logos-lez-rln/lez-rln/methods/guest/target
+rm -f vendor/logos-lez-rln/dev/wallet_config.json vendor/logos-lez-rln/dev/storage.json
+bash simulations/mix_lez_chat/setup_and_run.sh
+```
+
+**"Sender started FAIL"** — stale Qt RemoteObjects sockets:
+```bash
+rm -f /tmp/logos_*
+bash simulations/mix_lez_chat/run_simulation.sh --fresh
+```
+
+**"FAIL: Receiver received message (0)"** — timing issue, try re-running:
+```bash
+bash simulations/mix_lez_chat/run_simulation.sh --fresh
+```
+
+## Adapting for other LEZ programs
+
+This simulation provides a complete mix network infrastructure that other logos modules can reuse for testing. To test your own module:
+
+### What the sim provides
+- 4 logoscore mix nodes with `delivery_module` (Waku relay + mix + RLN)
+- LEZ sequencer with deployed RLN programs
+- RLN gifter service on node 0
+- Wallet modules for on-chain transactions
+
+### What you replace
+The chat_module sender/receiver instances (phase 5 of run_simulation.sh). Your module needs:
+
+1. **A C++ Qt plugin** implementing `PluginInterface` (see `chat_module_plugin.cpp`)
+   - `initLogos(LogosAPI*)` — receive the LogosAPI instance
+   - `eventResponse(QString, QVariantList)` signal — mandatory per logos-liblogos contract
+   - Methods exposed via `LOGOS_METHOD` for logoscore `-c` invocation
+2. **A shared library** with your program logic (like `liblogoschat.so`)
+3. **RLN integration** — wire `setRlnConfig` to pass RLN credentials from the C++ plugin to your library
+4. **EVENT: stderr fallback** — on Linux, Qt signal forwarding from plugin to logoscore doesn't work across the FFI thread boundary. Write event data to stderr in `EVENT:name:data` format for cross-platform reliability.
+
+### How to stage your module
+
+```bash
+MDIR=$(mktemp -d)
+mkdir -p "$MDIR/your_module"
+cp your_module_plugin.so "$MDIR/your_module/"
+cp libyour_library.so "$MDIR/your_module/"
+echo '{"name":"your_module","version":"1.0.0","type":"core",...}' > "$MDIR/your_module/manifest.json"
+
+logoscore -m "$MDIR" \
+  -l "liblogos_execution_zone_wallet_module,liblogos_rln_module,your_module" \
+  -c "liblogos_execution_zone_wallet_module.open($WALLET_CONFIG,$WALLET_STORAGE)" \
+  -c "your_module.init(@config.json)" \
+  -c "your_module.start()"
+```
+
+### Reference
+- `chat_module_plugin.cpp` — complete working example with RLN, gifter, mix, and event emission
+- `delivery_module_plugin.cpp` — more complex example with full RLN fetcher integration
+- `run_simulation.sh` — orchestration, module staging, and verification patterns
+
+## Logs
+
+All logs in `simulations/mix_lez_chat/.sim_state/`:
+- `node0.log` – `node3.log` — mix relay nodes
+- `chat_receiver.log` — receiver chat module
+- `chat_sender.log` — sender chat module
diff --git a/simulations/mix_lez_chat/fixtures/gifter_auth/.build/derive_addr b/simulations/mix_lez_chat/fixtures/gifter_auth/.build/derive_addr
new file mode 100755
index 0000000..9868e2f
Binary files /dev/null and b/simulations/mix_lez_chat/fixtures/gifter_auth/.build/derive_addr differ
diff --git a/simulations/mix_lez_chat/run_simulation.sh b/simulations/mix_lez_chat/run_simulation.sh
new file mode 100755
index 0000000..4bf0570
--- /dev/null
+++ b/simulations/mix_lez_chat/run_simulation.sh
@@ -0,0 +1,585 @@
+#!/usr/bin/env bash
+# Mix + LEZ RLN simulation using logos-chat-module as sender/receiver.
+# Reuses the logoscore mix node infrastructure from logos-lez-rln and replaces
+# chat2mix with logoscore instances running the chat_module plugin.
+#
+# Prerequisites:
+#   - logos-lez-rln repo as sibling or set LEZ_RLN_DIR
+#   - logos-chat-module built (nix build in ../logos-chat-module)
+#   - logos-chat built (make liblogoschat in this repo)
+#
+# Usage: ./run_simulation.sh [--fresh]
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+LOGOS_CHAT_DIR="$(cd "$SCRIPT_DIR/../.." && pwd)"
+CHAT_MODULE_DIR="${CHAT_MODULE_DIR:-$(cd "$LOGOS_CHAT_DIR/../logos-chat-module" && pwd)}"
+
+# Use vendored logos-lez-rln submodule, or auto-detect as sibling
+LEZ_RLN_DIR="${LEZ_RLN_DIR:-}"
+if [ -z "$LEZ_RLN_DIR" ] && [ -d "$LOGOS_CHAT_DIR/vendor/logos-lez-rln/lez-rln" ]; then
+    LEZ_RLN_DIR="$LOGOS_CHAT_DIR/vendor/logos-lez-rln"
+fi
+for candidate in "$LOGOS_CHAT_DIR/.." "$LOGOS_CHAT_DIR/../logos-lez-rln"; do
+    [ -n "$LEZ_RLN_DIR" ] && break
+    [ -d "$candidate/lez-rln" ] && [ -d "$candidate/lssa" ] && LEZ_RLN_DIR="$(cd "$candidate" && pwd)" && break
+done
+[ -z "$LEZ_RLN_DIR" ] && { echo "FATAL: Cannot find logos-lez-rln repo. Set LEZ_RLN_DIR or run: git submodule update --init --recursive"; exit 1; }
+
+DELIVERY_MODULE_DIR="${DELIVERY_MODULE_DIR:-$LEZ_RLN_DIR/logos-delivery-module}"
+DELIVERY_DIR="$DELIVERY_MODULE_DIR/vendor/logos-delivery"
+
+export RISC0_DEV_MODE=1
+export TMPDIR=/tmp
+export LOGOS_EVENT_STDERR=1  # Enable EVENT: stderr output for sim script event observation
+
+die() { echo "  FATAL: $*" >&2; exit 1; }
+log() { echo "[$(date '+%H:%M:%S')] $*"; }
+
+# --- Node identity constants (4 mix nodes) ---
+NODEKEYS=(
+    "f98e3fba96c32e8d1967d460f1b79457380e1a895f7971cecc8528abe733781a"
+    "09e9d134331953357bd38bbfce8edb377f4b6308b4f3bfbe85c610497053d684"
+    "ed54db994682e857d77cd6fb81be697382dc43aa5cd78e16b0ec8098549f860e"
+    "42f96f29f2d6670938b0864aced65a332dcf5774103b4c44ec4d0ea4ef3c47d6"
+)
+PEER_IDS=(
+    "16Uiu2HAmPiEs2ozjjJF2iN2Pe2FYeMC9w4caRHKYdLdAfjgbWM6o"
+    "16Uiu2HAmLtKaFaSWDohToWhWUZFLtqzYZGPFuXwKrojFVF6az5UF"
+    "16Uiu2HAmTEDHwAziWUSz6ZE23h5vxG2o4Nn7GazhMor4bVuMXTrA"
+    "16Uiu2HAmPwRKZajXtfb1Qsv45VVfRZgK3ENdfmnqzSrVm3BczF6f"
+)
+MIXKEYS=(
+    "c86029e02c05a7e25182974b519d0d52fcbafeca6fe191fbb64857fb05be1a53"
+    "b858ac16bbb551c4b2973313b1c8c8f7ea469fca03f1608d200bbf58d388ec7f"
+    "d8bd379bb394b0f22dd236d63af9f1a9bc45266beffc3fbbe19e8b6575f2535b"
+    "780fff09e51e98df574e266bf3266ec6a3a1ddfcf7da826a349a29c137009d49"
+)
+MIX_PUBKEYS=(
+    "9231e86da6432502900a84f867004ce78632ab52cd8e30b1ec322cd795710c2a"
+    "275cd6889e1f29ca48e5b9edb800d1a94f49f13d393a0ecf1a07af753506de6c"
+    "e0ed594a8d506681be075e8e23723478388fb182477f7a469309a25e7076fc18"
+    "8fd7a1a7c19b403d231452a9b1ea40eb1cc76f455d918ef8980e7685f9eeeb1f"
+)
+# --- Configurable parameters (override via environment) ---
+NUM_NODES=${SIM_NUM_NODES:-4}
+BASE_TCP_PORT=${SIM_BASE_TCP_PORT:-60001}
+BASE_DISC_PORT=${SIM_BASE_DISC_PORT:-9001}
+CLUSTER_ID=${SIM_CLUSTER_ID:-99}
+NUM_SHARDS=1
+CONTENT_TOPIC="/logos-chat/1/mix-test/proto"
+TEST_MESSAGE_PREFIX="chatmixtest"
+LOG_LEVEL=${SIM_LOG_LEVEL:-INFO}
+CHAT_RECV_PORT=${SIM_CHAT_RECV_PORT:-60010}
+CHAT_SEND_PORT=${SIM_CHAT_SEND_PORT:-60011}
+KADEMLIA_MIN_WAIT=${SIM_KADEMLIA_MIN_WAIT:-30}
+RECEIVER_MIN_WAIT=${SIM_RECEIVER_MIN_WAIT:-15}
+DELIVERY_TIMEOUT=${SIM_DELIVERY_TIMEOUT:-120}
+
+case "$(uname -s)-$(uname -m)" in
+  Darwin-arm64) PLATFORM="darwin-arm64-dev"; EXT="dylib";;
+  Linux-x86_64) PLATFORM="linux-x86_64-dev"; EXT="so";;
+  Linux-aarch64) PLATFORM="linux-aarch64-dev"; EXT="so";;
+  *) die "Unsupported platform";;
+esac
+
+STATE_DIR="$SCRIPT_DIR/.sim_state"
+FRESH=0
+for arg in "$@"; do [ "$arg" = "--fresh" ] && FRESH=1; done
+[ "$FRESH" -eq 1 ] && rm -rf "$STATE_DIR"
+mkdir -p "$STATE_DIR"
+
+SEQUENCER_PID=""
+OWN_SEQUENCER=0
+INSTANCE_PIDS=()
+MODULES_DIRS=()
+SENDER_PID=""
+RECEIVER_PID=""
+EXIT_CODE=1
+
+cleanup() {
+    set +u
+    echo ""; echo "=== Shutting down ==="
+    [ -n "$SENDER_PID" ] && kill "$SENDER_PID" 2>/dev/null || true
+    [ -n "$RECEIVER_PID" ] && kill "$RECEIVER_PID" 2>/dev/null || true
+    for pid in "${INSTANCE_PIDS[@]+"${INSTANCE_PIDS[@]}"}"; do [ -n "$pid" ] && kill "$pid" 2>/dev/null || true; done
+    pkill -f 'logos_host' 2>/dev/null || true
+    [ "$OWN_SEQUENCER" -eq 1 ] && [ -n "$SEQUENCER_PID" ] && kill "$SEQUENCER_PID" 2>/dev/null || true
+    for mdir in "${MODULES_DIRS[@]+"${MODULES_DIRS[@]}"}"; do [ -n "$mdir" ] && rm -rf "$mdir"; done
+    echo "  Logs: $STATE_DIR"; echo "Done."; exit "$EXIT_CODE"
+}
+trap cleanup EXIT
+
+echo "=== Mix + LEZ RLN Chat Simulation ($NUM_NODES nodes) ==="
+echo "  LEZ repo:         $LEZ_RLN_DIR"
+echo "  Chat module:      $CHAT_MODULE_DIR"
+echo "  Logos-chat:        $LOGOS_CHAT_DIR"
+echo ""
+
+pkill -f 'logos_host' 2>/dev/null || true; sleep 1
+# Clean stale QtRO LocalServer sockets from prior runs (can confuse capability_module lookups)
+rm -f /tmp/logos_* 2>/dev/null || true
+
+# ---------- Phase 1: Sequencer ----------
+echo "[1/6] Sequencer..."
+if nc -z 127.0.0.1 3040 2>/dev/null && [ "$FRESH" -eq 0 ]; then
+    SEQUENCER_PID=$(lsof -ti tcp:3040 2>/dev/null || true)
+    echo "  Already running (PID $SEQUENCER_PID)"
+else
+    [ "$(nc -z 127.0.0.1 3040 2>/dev/null; echo $?)" = "0" ] && kill "$(lsof -ti tcp:3040 2>/dev/null)" 2>/dev/null || true; sleep 1
+    rm -rf "$LEZ_RLN_DIR/lssa/rocksdb" "$LEZ_RLN_DIR/lssa/sequencer/service/bedrock_signing_key"
+
+    # Skip sequencer build if binary already exists (pre-built in Docker image).
+    # Also skip lssa auto-sync (requires full git history, fails on shallow clones).
+    if [ -x "$LEZ_RLN_DIR/lssa/target/debug/sequencer_service" ]; then
+        log "  Using pre-built sequencer"
+        SEQ_BIN="./target/debug/sequencer_service"; SEQ_CFG="sequencer/service/configs/debug/sequencer_config.json"
+    else
+        # Sequencer guest binaries must match the lssa rev that lez-rln's host-side
+        # client pins. Mismatch → DeserializeUnexpectedEnd (wire format divergence).
+        LSSA_REV=$(grep -oE 'rev\s*=\s*"[0-9a-f]+"' "$LEZ_RLN_DIR/lez-rln/Cargo.toml" | head -1 | sed 's/.*"\([0-9a-f]*\)"/\1/')
+        [ -z "$LSSA_REV" ] && die "Could not extract lssa rev from lez-rln/Cargo.toml"
+        if ! git -C "$LEZ_RLN_DIR/lssa" merge-base --is-ancestor "$LSSA_REV" HEAD 2>/dev/null; then
+            log "  Pinning lssa to $LSSA_REV..."
+            (cd "$LEZ_RLN_DIR/lssa" && git fetch --quiet origin && git checkout --quiet "$LSSA_REV") \
+                || die "lssa checkout $LSSA_REV failed"
+        fi
+        log "  Building sequencer..."
+        if (cd "$LEZ_RLN_DIR/lssa" && cargo build --features standalone -p sequencer_service 2>&1 | tail -3); then
+            SEQ_BIN="./target/debug/sequencer_service"; SEQ_CFG="sequencer/service/configs/debug/sequencer_config.json"
+        elif (cd "$LEZ_RLN_DIR/lssa" && cargo build --features standalone -p sequencer_runner 2>&1 | tail -3); then
+            SEQ_BIN="./target/debug/sequencer_runner"; SEQ_CFG="sequencer_runner/configs/debug"
+        else die "sequencer build failed"; fi
+    fi
+    (cd "$LEZ_RLN_DIR/lssa" && env RUST_LOG=info "$SEQ_BIN" "$SEQ_CFG") >"$STATE_DIR/sequencer.log" 2>&1 &
+    SEQUENCER_PID=$!; OWN_SEQUENCER=1; echo "  PID: $SEQUENCER_PID"
+    for _ in $(seq 1 60); do nc -z 127.0.0.1 3040 2>/dev/null && break; sleep 1; done
+    nc -z 127.0.0.1 3040 2>/dev/null || die "Sequencer failed to start"
+    log "  Ready."
+fi
+
+# ---------- Phase 2: Deploy programs ----------
+echo "[2/6] Deploying programs..."
+export NSSA_WALLET_HOME_DIR="$LEZ_RLN_DIR/dev"
+export WALLET_CONFIG="$NSSA_WALLET_HOME_DIR/wallet_config.json"
+export WALLET_STORAGE="$NSSA_WALLET_HOME_DIR/storage.json"
+TREE_ID_HEX="000102030405060708090a0b0c0d0e0f1011121314151617"
+GIFTER_ACCOUNT_FILE="$HOME/.logos-lez-rln/payment_account_${TREE_ID_HEX}.txt"
+
+rm -f "$WALLET_CONFIG" "$WALLET_STORAGE"
+# Use pre-built binary if available, otherwise cargo run
+if [ -x "$LEZ_RLN_DIR/lez-rln/target/debug/run_setup" ]; then
+    SETUP_OUTPUT=$(cd "$LEZ_RLN_DIR/lez-rln" && ./target/debug/run_setup 2>&1) || die "run_setup failed"
+else
+    SETUP_OUTPUT=$(cd "$LEZ_RLN_DIR/lez-rln" && cargo run --bin run_setup 2>&1) || die "run_setup failed"
+fi
+echo "$SETUP_OUTPUT" | tail -4
+CONFIG_ACCOUNT=$(echo "$SETUP_OUTPUT" | grep -oE 'Config account:\s+\S+' | awk '{print $NF}' || true)
+[ -z "$CONFIG_ACCOUNT" ] && die "Failed to parse config account"
+GIFTER_ACCOUNT=$(cat "$GIFTER_ACCOUNT_FILE" 2>/dev/null || true)
+[ -z "$GIFTER_ACCOUNT" ] && die "Gifter account not found at $GIFTER_ACCOUNT_FILE"
+
+# ---------- Phase 3: Prerequisites ----------
+echo "[3/6] Verifying prerequisites..."
+LOGOSCORE="${LOGOSCORE:-$(nix build github:logos-co/logos-liblogos/7df6195 --override-input logos-cpp-sdk github:logos-co/logos-cpp-sdk/a4bd66c --no-link --print-out-paths)/bin/logoscore}"
+RLN_MODULE="$LEZ_RLN_DIR/logos-rln-module/result-rln/lib"
+WALLET_MODULE="$LEZ_RLN_DIR/logos-rln-module/result-wallet/lib"
+
+# Delivery module plugin (for mix relay nodes)
+if [ -f "$DELIVERY_MODULE_DIR/build_plugin/modules/delivery_module_plugin.$EXT" ]; then
+    DELIVERY_PLUGIN="$DELIVERY_MODULE_DIR/build_plugin/modules/delivery_module_plugin.$EXT"
+else
+    DELIVERY_PLUGIN="$DELIVERY_MODULE_DIR/result/lib/delivery_module_plugin.$EXT"
+fi
+
+# Chat module plugin (for sender/receiver)
+# Prefer locally-built liblogoschat over nix result (uses vendored Nim toolchain)
+CHAT_MODULE_RESULT="$CHAT_MODULE_DIR/result"
+if [ -f "$LOGOS_CHAT_DIR/build/liblogoschat.$EXT" ]; then
+    CHAT_LIB="$LOGOS_CHAT_DIR/build/liblogoschat.$EXT"
+    log "  Using locally-built liblogoschat"
+else
+    CHAT_LIB="$CHAT_MODULE_RESULT/lib/liblogoschat.$EXT"
+fi
+CHAT_PLUGIN="$CHAT_MODULE_RESULT/lib/chat_module_plugin.$EXT"
+
+for check in \
+    "$RLN_MODULE/liblogos_rln_module.$EXT" \
+    "$WALLET_MODULE/liblogos_execution_zone_wallet_module.$EXT" \
+    "$DELIVERY_PLUGIN" \
+    "$CHAT_PLUGIN" \
+    "$CHAT_LIB"; do
+    [ -f "$check" ] || die "Missing: $check"
+done
+log "  All modules present."
+
+# ---------- Phase 4: Start mix nodes ----------
+echo "[4/6] Starting $NUM_NODES mix+LEZ nodes..."
+LOAD_ORDER="liblogos_execution_zone_wallet_module,liblogos_rln_module,delivery_module"
+WALLET_CALL="liblogos_execution_zone_wallet_module.open($WALLET_CONFIG,$WALLET_STORAGE)"
+BOOTSTRAP_PEER="/ip4/127.0.0.1/tcp/$BASE_TCP_PORT/p2p/${PEER_IDS[0]}"
+
+# NOTE: Off-chain credential generation (setup_credentials) and pre-registration
+# (register_commitments) are not used. All nodes and chat clients register their
+# RLN memberships at runtime via the gifter protocol on node 0.
+
+for i in $(seq 0 $((NUM_NODES - 1))); do
+    TCP_PORT=$((BASE_TCP_PORT + i)); DISC_PORT=$((BASE_DISC_PORT + i))
+    NODE_CONFIG="$STATE_DIR/node${i}_config.json"
+    LOG_FILE="$STATE_DIR/node${i}.log"
+    KAD_BOOTSTRAP="[]"; [ "$i" -gt 0 ] && KAD_BOOTSTRAP="[\"$BOOTSTRAP_PEER\"]"
+    PEER_LIST=""
+    for j in $(seq 0 $((NUM_NODES - 1))); do
+        [ "$j" -eq "$i" ] && continue
+        [ -n "$PEER_LIST" ] && PEER_LIST="$PEER_LIST,"
+        PEER_LIST="$PEER_LIST\"/ip4/127.0.0.1/tcp/$((BASE_TCP_PORT + j))/p2p/${PEER_IDS[$j]}\""
+    done
+    STATIC_PEERS="[$PEER_LIST]"
+
+    GIFTER_FIELDS=""
+    if [ "$i" -eq 0 ]; then
+        GIFTER_FIELDS="\"mixGifterService\": true, \"mixGifterWalletAccount\": \"$GIFTER_ACCOUNT\","
+    else
+        GIFTER_FIELDS="\"mixGifterNode\": \"$BOOTSTRAP_PEER\", \"mixGifterWalletAccount\": \"$GIFTER_ACCOUNT\","
+    fi
+
+    cat > "$NODE_CONFIG" <<EOF
+{
+  "clusterId": $CLUSTER_ID,
+  "numShardsInNetwork": $NUM_SHARDS,
+  "listenAddress": "127.0.0.1",
+  "tcpPort": $TCP_PORT,
+  "discv5UdpPort": $DISC_PORT,
+  "nat": "extip:127.0.0.1",
+  "extMultiAddrs": ["/ip4/127.0.0.1/tcp/$TCP_PORT"],
+  "extMultiAddrsOnly": true,
+  "nodekey": "${NODEKEYS[$i]}",
+  "staticnodes": $STATIC_PEERS,
+  "relay": true,
+  "lightpush": true,
+  "filter": true,
+  "mix": true,
+  "mixkey": "${MIXKEYS[$i]}",
+  "mixOnchainLEZ": true,
+  $GIFTER_FIELDS
+  "enableKadDiscovery": true,
+  "kadBootstrapNodes": $KAD_BOOTSTRAP,
+  "peerExchange": false,
+  "rendezvous": false,
+  "colocationLimit": 0,
+  "logLevel": "$LOG_LEVEL"
+}
+EOF
+
+    MDIR=$(mktemp -d); MODULES_DIRS+=("$MDIR")
+    # Stage wallet module
+    mkdir -p "$MDIR/liblogos_execution_zone_wallet_module"
+    cp -L "$WALLET_MODULE/liblogos_execution_zone_wallet_module.$EXT" "$MDIR/liblogos_execution_zone_wallet_module/"
+    [ -f "$WALLET_MODULE/libwallet_ffi.$EXT" ] && cp -L "$WALLET_MODULE/libwallet_ffi.$EXT" "$MDIR/liblogos_execution_zone_wallet_module/"
+    echo "{\"name\":\"liblogos_execution_zone_wallet_module\",\"version\":\"1.0.0\",\"type\":\"core\",\"main\":{\"$PLATFORM\":\"liblogos_execution_zone_wallet_module.$EXT\"},\"dependencies\":[],\"capabilities\":[]}" > "$MDIR/liblogos_execution_zone_wallet_module/manifest.json"
+    # Stage RLN module
+    mkdir -p "$MDIR/liblogos_rln_module"
+    cp -L "$RLN_MODULE/liblogos_rln_module.$EXT" "$MDIR/liblogos_rln_module/"
+    cp -L "$RLN_MODULE/liblez_rln_ffi.$EXT" "$MDIR/liblogos_rln_module/" 2>/dev/null || true
+    echo "{\"name\":\"liblogos_rln_module\",\"version\":\"1.0.0\",\"type\":\"core\",\"main\":{\"$PLATFORM\":\"liblogos_rln_module.$EXT\"},\"dependencies\":[\"liblogos_execution_zone_wallet_module\"],\"capabilities\":[]}" > "$MDIR/liblogos_rln_module/manifest.json"
+    # Stage delivery module
+    mkdir -p "$MDIR/delivery_module"
+    cp -L "$DELIVERY_PLUGIN" "$MDIR/delivery_module/"
+    if [ -f "$DELIVERY_DIR/build/liblogosdelivery.$EXT" ]; then
+        cp -L "$DELIVERY_DIR/build/liblogosdelivery.$EXT" "$MDIR/delivery_module/"
+    else
+        cp -L "$DELIVERY_MODULE_DIR/result/lib/liblogosdelivery.$EXT" "$MDIR/delivery_module/" 2>/dev/null || true
+    fi
+    for pq in "$DELIVERY_MODULE_DIR"/result/lib/libpq*; do [ -f "$pq" ] && cp -L "$pq" "$MDIR/delivery_module/"; done
+    echo "{\"name\":\"delivery_module\",\"version\":\"1.0.0\",\"type\":\"core\",\"main\":{\"$PLATFORM\":\"delivery_module_plugin.$EXT\"},\"dependencies\":[],\"capabilities\":[]}" > "$MDIR/delivery_module/manifest.json"
+
+    log "  Starting node $i (port $TCP_PORT)..."
+    (cd "$STATE_DIR" && TMPDIR=/tmp "$LOGOSCORE" -m "$MDIR" -l "$LOAD_ORDER" \
+        -c "$WALLET_CALL" \
+        -c "delivery_module.createNode(@$NODE_CONFIG)" \
+        -c "delivery_module.start()" \
+        -c "delivery_module.setRlnConfig($CONFIG_ACCOUNT,$i)" \
+        -c "delivery_module.subscribe($CONTENT_TOPIC)" \
+        </dev/null >"$LOG_FILE" 2>&1) &
+    EXPECTED_CALLS=5
+    NODE_PID=$!; INSTANCE_PIDS+=($NODE_PID)
+    WAIT_TIMEOUT=90
+    for t in $(seq 1 $WAIT_TIMEOUT); do
+        N=$(grep -c '^Method call successful' "$LOG_FILE" 2>/dev/null || true); N=${N:-0}
+        [ "$N" -ge "$EXPECTED_CALLS" ] && break; sleep 1
+    done
+    if [ "${N:-0}" -ge "$EXPECTED_CALLS" ]; then
+        log "    Node $i ready ($N/$EXPECTED_CALLS calls) PID: $NODE_PID"
+    else
+        echo "  WARNING: Node $i: $N/$EXPECTED_CALLS calls"
+    fi
+    sleep 10
+done
+echo ""
+
+# ---------- Phase 5: Chat module sender/receiver ----------
+echo "[5/6] Starting chat module instances..."
+
+# Wait for all nodes to be fully ready (gifter registrations finalize during startup)
+for i in $(seq 0 $((NUM_NODES - 1))); do
+    LOG_FILE="$STATE_DIR/node${i}.log"
+    EC=5
+    for t in $(seq 1 120); do
+        N=$(grep -c '^Method call successful' "$LOG_FILE" 2>/dev/null || true); N=${N:-0}
+        [ "$N" -ge "$EC" ] && break; sleep 2
+    done
+done
+
+# Wait for mix mesh + RLN root convergence. Requires: 3 gifter registrations on
+# node0, LEZ root polling events across all nodes, AND min 30s floor for mix
+# protocol handshakes to complete (no single log line signals this cleanly).
+echo "  Waiting for kademlia propagation + RLN convergence..."
+KADEMLIA_T0=$SECONDS
+while true; do
+    ELAPSED=$((SECONDS - KADEMLIA_T0))
+    GR=$(sed 's/\x1b\[[0-9;]*m//g' "$STATE_DIR/node0.log" 2>/dev/null | grep -c "RLN gifter registration succeeded" || true); GR=${GR:-0}
+    LR=0
+    for i in $(seq 0 $((NUM_NODES - 1))); do
+        L=$(sed 's/\x1b\[[0-9;]*m//g' "$STATE_DIR/node${i}.log" 2>/dev/null | grep -c "Polled valid roots\|Fetched roots from\|valid_roots\|OnchainLEZGroupManager initialized\|Wired LEZ callbacks" || true)
+        LR=$((LR + L))
+    done
+    if [ "$ELAPSED" -ge "$KADEMLIA_MIN_WAIT" ] && [ "$GR" -ge 3 ] && [ "$LR" -ge 40 ]; then break; fi
+    [ "$ELAPSED" -ge 120 ] && break
+    sleep 1
+done
+log "  Kademlia ready after $((SECONDS - KADEMLIA_T0))s ($GR gifter regs, $LR LEZ root events)"
+
+RECEIVER_LOG="$STATE_DIR/chat_receiver.log"
+SENDER_LOG="$STATE_DIR/chat_sender.log"
+
+# Build mix node list for chat config (multiaddr:mixPubKey format)
+MIXNODE_LIST=""
+for j in $(seq 0 $((NUM_NODES - 1))); do
+    [ -n "$MIXNODE_LIST" ] && MIXNODE_LIST="$MIXNODE_LIST,"
+    MIXNODE_LIST="$MIXNODE_LIST\"/ip4/127.0.0.1/tcp/$((BASE_TCP_PORT + j))/p2p/${PEER_IDS[$j]}:${MIX_PUBKEYS[$j]}\""
+done
+
+# Helper: stage chat_module for a logoscore instance
+stage_chat_module() {
+    local MDIR=$1
+    mkdir -p "$MDIR/liblogos_execution_zone_wallet_module"
+    cp -L "$WALLET_MODULE/liblogos_execution_zone_wallet_module.$EXT" "$MDIR/liblogos_execution_zone_wallet_module/"
+    [ -f "$WALLET_MODULE/libwallet_ffi.$EXT" ] && cp -L "$WALLET_MODULE/libwallet_ffi.$EXT" "$MDIR/liblogos_execution_zone_wallet_module/"
+    echo "{\"name\":\"liblogos_execution_zone_wallet_module\",\"version\":\"1.0.0\",\"type\":\"core\",\"main\":{\"$PLATFORM\":\"liblogos_execution_zone_wallet_module.$EXT\"},\"dependencies\":[],\"capabilities\":[]}" > "$MDIR/liblogos_execution_zone_wallet_module/manifest.json"
+
+    mkdir -p "$MDIR/liblogos_rln_module"
+    cp -L "$RLN_MODULE/liblogos_rln_module.$EXT" "$MDIR/liblogos_rln_module/"
+    cp -L "$RLN_MODULE/liblez_rln_ffi.$EXT" "$MDIR/liblogos_rln_module/" 2>/dev/null || true
+    echo "{\"name\":\"liblogos_rln_module\",\"version\":\"1.0.0\",\"type\":\"core\",\"main\":{\"$PLATFORM\":\"liblogos_rln_module.$EXT\"},\"dependencies\":[\"liblogos_execution_zone_wallet_module\"],\"capabilities\":[]}" > "$MDIR/liblogos_rln_module/manifest.json"
+
+    mkdir -p "$MDIR/chat_module"
+    cp -L "$CHAT_PLUGIN" "$MDIR/chat_module/"
+    cp -L "$CHAT_LIB" "$MDIR/chat_module/"
+    echo "{\"name\":\"chat_module\",\"version\":\"1.0.0\",\"type\":\"core\",\"main\":{\"$PLATFORM\":\"chat_module_plugin.$EXT\"},\"dependencies\":[],\"capabilities\":[]}" > "$MDIR/chat_module/manifest.json"
+}
+
+CHAT_LOAD_ORDER="liblogos_execution_zone_wallet_module,liblogos_rln_module,chat_module"
+
+# --- Receiver ---
+RECV_MDIR=$(mktemp -d); MODULES_DIRS+=("$RECV_MDIR")
+stage_chat_module "$RECV_MDIR"
+
+RECV_CONFIG="$STATE_DIR/chat_receiver_config.json"
+# Build static peer list (ENR or multiaddr) for chat nodes to join relay mesh
+CHAT_STATIC_PEERS=""
+for j in $(seq 0 $((NUM_NODES - 1))); do
+    [ -n "$CHAT_STATIC_PEERS" ] && CHAT_STATIC_PEERS="$CHAT_STATIC_PEERS,"
+    CHAT_STATIC_PEERS="$CHAT_STATIC_PEERS\"/ip4/127.0.0.1/tcp/$((BASE_TCP_PORT + j))/p2p/${PEER_IDS[$j]}\""
+done
+cat > "$RECV_CONFIG" <<EOF
+{
+  "name": "receiver",
+  "clusterId": $CLUSTER_ID,
+  "shardId": 0,
+  "port": $CHAT_RECV_PORT,
+  "mixEnabled": true,
+  "mixNodes": [$MIXNODE_LIST],
+  "destPeerAddr": "$BOOTSTRAP_PEER",
+  "minMixPoolSize": 4,
+  "gifterNodeAddr": "$BOOTSTRAP_PEER",
+  "staticPeers": [$CHAT_STATIC_PEERS]
+}
+EOF
+
+TEST_MSG_HEX=$(printf '%s' "$TEST_MESSAGE_PREFIX" | xxd -p | tr -d '\n')
+
+log "  Starting receiver..."
+(cd "$STATE_DIR" && TMPDIR=/tmp "$LOGOSCORE" -m "$RECV_MDIR" -l "$CHAT_LOAD_ORDER" \
+    -c "$WALLET_CALL" \
+    -c "chat_module.initChat(@$RECV_CONFIG)" \
+    -c "chat_module.setEventCallback()" \
+    -c "chat_module.startChat()" \
+    -c "chat_module.setRlnConfig($CONFIG_ACCOUNT,5)" \
+    -c "chat_module.createIntroBundle()" \
+    </dev/null >"$RECEIVER_LOG" 2>&1) &
+RECEIVER_PID=$!; INSTANCE_PIDS+=($RECEIVER_PID)
+log "  Receiver PID: $RECEIVER_PID"
+
+# Wait for receiver to complete all method calls (6 calls now including createIntroBundle)
+RECV_EXPECTED=6
+for t in $(seq 1 180); do
+    N=$(grep -c '^Method call successful' "$RECEIVER_LOG" 2>/dev/null || true); N=${N:-0}
+    [ "$N" -ge "$RECV_EXPECTED" ] && break; sleep 2
+done
+N=$(grep -c '^Method call successful' "$RECEIVER_LOG" 2>/dev/null || true); N=${N:-0}
+log "  Receiver method calls: $N/$RECV_EXPECTED"
+
+# Extract intro bundle from receiver log (event callback delivers it as chatCreateIntroBundleResult)
+INTRO_BUNDLE=""
+for t in $(seq 1 30); do
+    INTRO_BUNDLE=$(grep -oE 'logos_chatintro_[A-Za-z0-9_-]+' "$RECEIVER_LOG" 2>/dev/null | head -1 || true)
+    [ -n "$INTRO_BUNDLE" ] && break; sleep 2
+done
+if [ -n "$INTRO_BUNDLE" ]; then
+    log "  Receiver intro bundle: ${INTRO_BUNDLE:0:40}..."
+else
+    log "  WARNING: Could not extract intro bundle from receiver log"
+fi
+
+# Wait for receiver's async startChat to finish (Waku client started) AND give
+# filter subscription a 15s floor to propagate through the relay mesh.
+echo "  Waiting for receiver to join mix network..."
+JOIN_T0=$SECONDS
+while true; do
+    ELAPSED=$((SECONDS - JOIN_T0))
+    RS=$(grep -c "Waku client started" "$RECEIVER_LOG" 2>/dev/null || true); RS=${RS:-0}
+    [ "$ELAPSED" -ge "$RECEIVER_MIN_WAIT" ] && [ "$RS" -ge 1 ] && break
+    [ "$ELAPSED" -ge 60 ] && break
+    sleep 1
+done
+log "  Receiver joined after $((SECONDS - JOIN_T0))s"
+
+# --- Sender ---
+SEND_MDIR=$(mktemp -d); MODULES_DIRS+=("$SEND_MDIR")
+stage_chat_module "$SEND_MDIR"
+
+SEND_CONFIG="$STATE_DIR/chat_sender_config.json"
+cat > "$SEND_CONFIG" <<EOF
+{
+  "name": "sender",
+  "clusterId": $CLUSTER_ID,
+  "shardId": 0,
+  "port": $CHAT_SEND_PORT,
+  "mixEnabled": true,
+  "mixNodes": [$MIXNODE_LIST],
+  "destPeerAddr": "$BOOTSTRAP_PEER",
+  "minMixPoolSize": 4,
+  "gifterNodeAddr": "$BOOTSTRAP_PEER",
+  "staticPeers": [$CHAT_STATIC_PEERS]
+}
+EOF
+
+# Build sender -c calls: init, start, setRlnConfig, then if we have the intro bundle,
+# create a private conversation with the test message
+SENDER_CALLS="-c \"$WALLET_CALL\""
+SENDER_CALLS="$SENDER_CALLS -c \"chat_module.initChat(@$SEND_CONFIG)\""
+SENDER_CALLS="$SENDER_CALLS -c \"chat_module.setEventCallback()\""
+SENDER_CALLS="$SENDER_CALLS -c \"chat_module.startChat()\""
+# RLN leaf indices: 0-3 = mix nodes, 4 = gifter-reserved, 5 = receiver, 6 = sender
+SENDER_CALLS="$SENDER_CALLS -c \"chat_module.setRlnConfig($CONFIG_ACCOUNT,6)\""
+if [ -n "$INTRO_BUNDLE" ]; then
+    SENDER_CALLS="$SENDER_CALLS -c \"chat_module.newPrivateConversation($INTRO_BUNDLE,$TEST_MSG_HEX)\""
+fi
+
+log "  Starting sender..."
+eval "(cd \"$STATE_DIR\" && TMPDIR=/tmp \"$LOGOSCORE\" -m \"$SEND_MDIR\" -l \"$CHAT_LOAD_ORDER\" \
+    $SENDER_CALLS \
+    </dev/null >\"$SENDER_LOG\" 2>&1) &"
+SENDER_PID=$!; INSTANCE_PIDS+=($SENDER_PID)
+log "  Sender PID: $SENDER_PID"
+
+# Wait for sender to complete method calls
+SEND_EXPECTED=6
+[ -n "$INTRO_BUNDLE" ] && SEND_EXPECTED=7
+for t in $(seq 1 180); do
+    N=$(grep -c '^Method call successful' "$SENDER_LOG" 2>/dev/null || true); N=${N:-0}
+    [ "$N" -ge "$SEND_EXPECTED" ] && break; sleep 2
+done
+
+# On slower systems (Docker/ARM), the sender's async gifter registration may not
+# complete before newPrivateConversation runs. Wait for gifter + RLN readiness
+# before checking for message delivery. If newPrivateConversation initially failed,
+# the Nim async code will retry once credentials are valid.
+echo "  Waiting for sender RLN readiness..."
+SENDER_RLN_T0=$SECONDS
+for t in $(seq 1 60); do
+    SG=$(sed 's/\x1b\[[0-9;]*m//g' "$SENDER_LOG" 2>/dev/null | grep -c "Registered via RLN gifter\|Waku client started" || true)
+    [ "${SG:-0}" -ge 2 ] && break
+    sleep 1
+done
+log "  Sender RLN ready after $((SECONDS - SENDER_RLN_T0))s"
+N=$(grep -c '^Method call successful' "$SENDER_LOG" 2>/dev/null || true); N=${N:-0}
+log "  Sender method calls: $N/$SEND_EXPECTED"
+
+# Poll receiver log for incoming message(s) instead of waiting a fixed 120s.
+echo "  Waiting for message delivery via mix..."
+DELIVERY_T0=$SECONDS
+for t in $(seq 1 $DELIVERY_TIMEOUT); do
+    RM=$(grep -c "chatNewMessage\|chatNewConversation\|New Message\|new_message" "$RECEIVER_LOG" 2>/dev/null || true); RM=${RM:-0}
+    [ "$RM" -ge 1 ] && break
+    sleep 1
+done
+log "  Delivery check after $((SECONDS - DELIVERY_T0))s (messages: $RM)"
+
+echo ""
+
+# ---------- Phase 6: Verify ----------
+echo "[6/6] Verification"; echo ""
+PASS=0; FAIL=0
+check() { local c=$1 d=$2; if eval "$c"; then echo "  PASS: $d"; PASS=$((PASS+1)); else echo "  FAIL: $d"; FAIL=$((FAIL+1)); fi; }
+
+echo "  --- logos-core mix nodes ---"
+for i in $(seq 0 $((NUM_NODES - 1))); do
+    M=$(sed 's/\x1b\[[0-9;]*m//g' "$STATE_DIR/node${i}.log" 2>/dev/null | grep -c "mounting mix protocol" || true)
+    check "[ ${M:-0} -ge 1 ]" "Node $i mounted mix ($M)"
+done
+echo ""
+
+echo "  --- RLN gifter ---"
+GIFTER_MOUNTED=$(sed 's/\x1b\[[0-9;]*m//g' "$STATE_DIR/node0.log" 2>/dev/null | grep -c "RLN gifter service mounted" || true)
+check "[ ${GIFTER_MOUNTED:-0} -ge 1 ]" "Node 0 gifter service mounted ($GIFTER_MOUNTED)"
+echo ""
+
+echo "  --- LEZ RLN ---"
+LEZ_ROOTS=0
+for i in $(seq 0 $((NUM_NODES - 1))); do
+    R=$(sed 's/\x1b\[[0-9;]*m//g' "$STATE_DIR/node${i}.log" 2>/dev/null | grep -c "Polled valid roots\|Fetched roots from\|valid_roots\|OnchainLEZGroupManager initialized\|Wired LEZ callbacks" || true)
+    LEZ_ROOTS=$((LEZ_ROOTS + R))
+done
+check "[ $LEZ_ROOTS -ge 1 ]" "LEZ RLN active ($LEZ_ROOTS events across nodes)"
+echo ""
+
+echo "  --- chat module ---"
+RECV_INIT=$(grep -c "chatInitResult\|Chat context created" "$RECEIVER_LOG" 2>/dev/null || true)
+check "[ ${RECV_INIT:-0} -ge 1 ]" "Receiver initialized ($RECV_INIT)"
+RECV_START=$(grep -c "chatStartResult\|Waku client started" "$RECEIVER_LOG" 2>/dev/null || true)
+check "[ ${RECV_START:-0} -ge 1 ]" "Receiver started ($RECV_START)"
+SEND_INIT=$(grep -c "chatInitResult\|Chat context created" "$SENDER_LOG" 2>/dev/null || true)
+check "[ ${SEND_INIT:-0} -ge 1 ]" "Sender initialized ($SEND_INIT)"
+SEND_START=$(grep -c "chatStartResult\|Waku client started" "$SENDER_LOG" 2>/dev/null || true)
+check "[ ${SEND_START:-0} -ge 1 ]" "Sender started ($SEND_START)"
+
+RECV_MIX=$(grep -c "mounting mix protocol\|Wired LEZ callbacks" "$RECEIVER_LOG" 2>/dev/null || true)
+check "[ ${RECV_MIX:-0} -ge 1 ]" "Receiver mounted mix+LEZ ($RECV_MIX)"
+SEND_MIX=$(grep -c "mounting mix protocol\|Wired LEZ callbacks" "$SENDER_LOG" 2>/dev/null || true)
+check "[ ${SEND_MIX:-0} -ge 1 ]" "Sender mounted mix+LEZ ($SEND_MIX)"
+
+RECV_BUNDLE=$(grep -c "logos_chatintro_" "$RECEIVER_LOG" 2>/dev/null || true)
+check "[ ${RECV_BUNDLE:-0} -ge 1 ]" "Receiver created intro bundle ($RECV_BUNDLE)"
+echo ""
+
+echo "  --- message exchange ---"
+SEND_MSG=$(grep -c "chatNewPrivateConversationResult\|chatSendMessageResult\|Message sent via mix" "$SENDER_LOG" 2>/dev/null || true)
+check "[ ${SEND_MSG:-0} -ge 1 ]" "Sender sent message ($SEND_MSG)"
+RECV_MSG=$(grep -c "chatNewMessage\|chatNewConversation\|New Message\|new_message" "$RECEIVER_LOG" 2>/dev/null || true)
+check "[ ${RECV_MSG:-0} -ge 1 ]" "Receiver received message ($RECV_MSG)"
+
+echo ""; echo "  =========================================="
+if [ "$FAIL" -eq 0 ]; then echo "  ALL $PASS CHECKS PASSED"; EXIT_CODE=0
+else echo "  $FAIL FAILED, $PASS passed"; EXIT_CODE=1; fi
+echo "  =========================================="
diff --git a/simulations/mix_lez_chat/setup_and_run.sh b/simulations/mix_lez_chat/setup_and_run.sh
new file mode 100755
index 0000000..d93550e
--- /dev/null
+++ b/simulations/mix_lez_chat/setup_and_run.sh
@@ -0,0 +1,95 @@
+#!/usr/bin/env bash
+# One-shot: init nested submodules, build all modules, run mix+LEZ chat sim.
+#
+# Prerequisites: nix (with flakes), Docker, cargo-risczero.
+#
+# Environment variables:
+#   CHAT_MODULE_DIR    — path to logos-chat-module checkout (default: ../logos-chat-module)
+#   CHAT_MODULE_REPO   — git URL to clone if CHAT_MODULE_DIR doesn't exist
+#   CHAT_MODULE_BRANCH — branch to clone (default: feat/logos-delivery)
+#   SIM_*              — simulation parameters, see run_simulation.sh / README.md
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+CHAT_MODULE_DIR="${CHAT_MODULE_DIR:-$ROOT/../logos-chat-module}"
+CHAT_MODULE_REPO="${CHAT_MODULE_REPO:-git@github.com:adklempner/logos-chat-module.git}"
+CHAT_MODULE_BRANCH="${CHAT_MODULE_BRANCH:-feat/logos-delivery}"
+
+log() { echo "[$(date '+%H:%M:%S')] $*"; }
+
+cd "$ROOT"
+
+# Docker/CI: nix can't sandbox inside containers. Remove /homeless-shelter
+# (nix's sandbox HOME stub) and export NIX_CONFIG to disable sandboxing.
+if [ -f /.dockerenv ] || grep -q docker /proc/1/cgroup 2>/dev/null; then
+    rmdir /homeless-shelter 2>/dev/null || true
+    export NIX_CONFIG="sandbox = false
+${NIX_CONFIG:-}"
+fi
+
+# On Linux with nix, bindgen (used by rocksdb/sequencer) needs LIBCLANG_PATH
+# and system headers. This covers both Docker and native nix-on-Linux.
+if [ "$(uname -s)" = "Linux" ] && [ -d /nix/store ] && [ -z "${LIBCLANG_PATH:-}" ]; then
+    CLANG_SO=$(find /nix/store -maxdepth 3 -name 'libclang.so' 2>/dev/null | head -1 || true)
+    if [ -n "$CLANG_SO" ]; then
+        export LIBCLANG_PATH=$(dirname "$CLANG_SO")
+        STDBOOL=$(find "$LIBCLANG_PATH" -maxdepth 5 -name 'stdbool.h' 2>/dev/null | head -1 || true)
+        [ -n "$STDBOOL" ] && export BINDGEN_EXTRA_CLANG_ARGS="-I$(dirname "$STDBOOL")"
+    fi
+    log "Docker detected — disabled nix sandbox, LIBCLANG_PATH=$LIBCLANG_PATH"
+fi
+
+# 1. Init submodules. Top-level first (non-recursive to avoid circular refs
+#    in vendor/logos-lez-rln), then nwaku/nimbus-build-system recursively,
+#    then logos-lez-rln's nested submodules selectively.
+log "Initializing top-level submodules..."
+git submodule update --init
+(cd vendor/nwaku && git submodule update --init --recursive)
+(cd vendor/nimbus-build-system && git submodule update --init --recursive)
+
+# Init nested submodules inside vendor/logos-lez-rln non-recursively
+#    (recursive init hits circular submodule references).
+#    Preserve pre-built guest binaries across submodule reset (they're
+#    architecture-independent RISC-V ELFs that take ~10min to rebuild).
+GUEST_DIR="vendor/logos-lez-rln/lez-rln/methods/guest/target/riscv32im-risc0-zkvm-elf/docker"
+# Check repo tree first, then /tmp/guest-bins/ (staged by run_in_docker.sh)
+GUEST_TMP=""
+if [ -f "$GUEST_DIR/rln_registration.bin" ]; then
+    GUEST_TMP=$(mktemp -d)
+    cp "$GUEST_DIR"/*.bin "$GUEST_TMP/"
+    log "Preserved guest binaries from repo"
+elif [ -f "/tmp/guest-bins/rln_registration.bin" ]; then
+    GUEST_TMP="/tmp/guest-bins"
+    log "Using guest binaries from /tmp/guest-bins/"
+fi
+log "Initializing nested submodules in vendor/logos-lez-rln..."
+(cd vendor/logos-lez-rln && \
+    git submodule update --init lssa logos-delivery logos-delivery-module logos-execution-zone-module && \
+    cd logos-delivery-module && git submodule update --init vendor/logos-delivery)
+if [ -d "${GUEST_TMP:-}" ]; then
+    mkdir -p "$GUEST_DIR"
+    cp "$GUEST_TMP"/*.bin "$GUEST_DIR/"
+    rm -rf "$GUEST_TMP"
+    log "Restored guest binaries"
+fi
+
+# 2. Build LEZ modules (RLN, wallet, delivery plugin, guest zkVM binaries).
+log "Building LEZ modules via vendor/logos-lez-rln/build_all.sh..."
+bash vendor/logos-lez-rln/build_all.sh
+
+# 3. Build liblogoschat (Nim shared library).
+log "Building liblogoschat..."
+make update
+make liblogoschat
+
+# 4. Clone and build logos-chat-module (C++ Qt plugin).
+if [ ! -d "$CHAT_MODULE_DIR" ]; then
+    log "Cloning logos-chat-module to $CHAT_MODULE_DIR..."
+    git clone -b "$CHAT_MODULE_BRANCH" "$CHAT_MODULE_REPO" "$CHAT_MODULE_DIR"
+fi
+log "Building logos-chat-module..."
+(cd "$CHAT_MODULE_DIR" && nix build)
+
+# 5. Run the simulation.
+log "Starting mix+LEZ chat simulation..."
+exec bash "$ROOT/simulations/mix_lez_chat/run_simulation.sh" --fresh "$@"