feat(ledger/app): add initial ledger app (#1870)

Description
---
feat(ledger/app): add initial ledger app

Motivation and Context
---
Adds ledger app boilerplate code and implements get_version,
get_app_name and get_public_key

Next up: transaction signing

How Has This Been Tested?
---
Client test with speculos

Breaking Changes
---

- [x] None
- [ ] Requires data directory to be deleted
- [ ] Other - Please specify

Author: sdbondi

Cargo.lock

@@ -46,7 +46,8 @@ members = [
     "crates/wallet/sdk",
     "crates/wallet/sdk_services",
     "crates/wallet/storage_sqlite",
-    "crates/wallet/tari-ledger-client",
+    "crates/wallet/ledger/client",
+    "crates/wallet/ledger/common",
     "crates/ootle_address",
     "crates/ootle_serde",
     "crates/ootle_byte_type",
@@ -152,6 +153,7 @@ tari_hashing = "5.3.0-pre.1"
 
 ## Ledger
 minotari_ledger_wallet_common = { git = "https://github.com/tari-project/tari.git", tag = "v5.3.0-pre.1" }
+ootle_ledger_common = { path = "crates/wallet/ledger/common", version = "0.1.0" }
 
 # networking crates
 proto_builder = { path = "networking/proto_builder" }

Cargo.toml

@@ -0,0 +1,12 @@
+[target.nanosplus]
+runner = "speculos -m nanosplus" # Or change the target
+
+[unstable]
+avoid-dev-deps = true
+build-std = ["core", "alloc"]
+build-std-features = ["compiler-builtins-mem"]
+host-config = true
+target-applies-to-host = true
+
+[host]
+rustflags = ["-Ctarget-feature=-crt-static"]

crates/wallet/ledger/app/.cargo/config.toml

@@ -0,0 +1,48 @@
+[workspace]
+[package]
+name = "ootle-ledger-app"
+version = "0.1.0"
+description = "Ootle Ledger App"
+edition = "2024"
+authors = ["Tari Development Community"]
+license = "BSD-3-Clause"
+
+[[bin]]
+name = "ootle"
+path = "src/main.rs"
+
+[dependencies]
+ootle_ledger_common = { path = "../common", default-features = false }
+
+ledger_device_sdk = { version = "1.33.1" }
+curve25519-dalek = { version = "4", default-features = false, features = ["alloc", "rand_core", "precomputed-tables", "zeroize"] }
+borsh = { version = "1.6.0", default-features = false, features = ["derive"] }
+zeroize = { version = "1.8.2", default-features = false, features = ["alloc"] }
+
+[features]
+bagl = []
+nbgl = ["ledger_device_sdk/io_new", "ledger_device_sdk/nano_nbgl"]
+
+[profile.release]
+opt-level = "s"
+lto = true
+strip = "debuginfo"
+panic = "abort"
+
+[package.metadata.ledger]
+curve = ["secp256k1"]
+flags = "0"
+path = ["44'/535348'"]
+name = "Tari Ootle Wallet"
+
+[package.metadata.ledger.nanox]
+icon = "images/key_14x14.gif"
+
+[package.metadata.ledger.nanosplus]
+icon = "images/key_14x14.gif"
+
+[package.metadata.ledger.stax]
+icon = "images/key_32x32.gif"
+
+[package.metadata.ledger.flex]
+icon = "images/key_40x40.gif"

crates/wallet/ledger/app/Cargo.toml

@@ -0,0 +1,70 @@
+#!/usr/bin/env bash
+
+#
+# //  Copyright 2026 The Tari Project
+# //  SPDX-License-Identifier: BSD-3-Clause
+#
+
+set -e
+
+# 🎯 Ledger App Builder
+# Builds the Ledger app using Docker for a given target device.
+
+SUPPORTED_TARGETS=("nanosplus" "nanox" "nanos" "stax" "flex")
+
+usage() {
+  echo ""
+  echo "🦀 Ledger App Builder 🦀"
+  echo ""
+  echo "Usage: $0 <target>"
+  echo ""
+  echo "📦 Supported targets:"
+  for t in "${SUPPORTED_TARGETS[@]}"; do
+    echo "   • $t"
+  done
+  echo ""
+  echo "📖 Examples:"
+  echo "   $0 nanosplus"
+  echo "   $0 nanox"
+  echo ""
+  exit 1
+}
+
+if [ -z "$1" ]; then
+  echo "❌ Error: No target specified."
+  usage
+fi
+
+TARGET="$1"
+
+# Validate target
+VALID=false
+for t in "${SUPPORTED_TARGETS[@]}"; do
+  if [ "$TARGET" = "$t" ]; then
+    VALID=true
+    break
+  fi
+done
+
+if [ "$VALID" = false ]; then
+  echo "❌ Error: Unknown target '$TARGET'."
+  usage
+fi
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+echo ""
+echo "🚀 Building Ledger app for target: $TARGET"
+echo "📁 Using source directory: $SCRIPT_DIR"
+echo ""
+
+docker run --rm -it \
+  -v "$SCRIPT_DIR:/app" \
+  -w /app/app \
+  ghcr.io/ledgerhq/ledger-app-builder/ledger-app-builder \
+  cargo ledger setup && cargo ledger build "$TARGET"
+
+echo ""
+echo "✅ Build complete for target: $TARGET"
+echo ""
+