Tempo Ledger Plugin

Ledger hardware wallet plugin for signing Tempo blockchain transactions with clear signing.

What is Tempo?

Tempo is a payments-focused EVM blockchain designed for high-throughput stablecoin transactions. Key features:

• TIP-20 Tokens: Enshrined token standard (precompile-based, 6 decimals)
• USD Gas Payments: Pay transaction fees in stablecoins
• Stablecoin DEX: Enshrined orderbook exchange
• Sub-second Finality: ~500ms block times with immediate finality

Features

This plugin provides clear signing for Tempo transactions, showing human-readable information on your Ledger device:

TIP-20 Token Operations

• Transfer: Send tokens with recipient and amount displayed
• Transfer with Memo: Includes 32-byte memo display
• Approve: Set token allowances with spender displayed
• Mint/Burn: Token issuance operations

Stablecoin DEX

• Swap: Buy/sell stablecoins with amount limits displayed
• Place Order: Limit orders with price, amount, and order type
• Cancel Order: Cancel existing orders
• Withdraw: Withdraw from DEX balance

Fee Management

• Set Fee Token: Choose which stablecoin to pay fees in

Supported Devices

• Ledger Nano X
• Ledger Nano S Plus
• Ledger Stax
• Ledger Flex

Building

Prerequisites

• Docker
• Ledger VS Code Extension (recommended)

Quick Build

# Clone with submodules
git clone --recursive https://github.com/tempoxyz/ledger-app-tempo
cd ledger-app-tempo

# Build using Docker
docker run --rm -v $(pwd):/app ghcr.io/ledgerhq/ledger-app-builder/ledger-app-builder:latest \
    bash -c "cd /app && make BOLOS_SDK=/opt/nanox-secure-sdk"

Using VS Code

1. Install the Ledger Developer Tools extension
2. Open this folder in VS Code
3. Use Ctrl+Shift+B to access build tasks
4. Select "Build" to compile for your target device

Testing

# Install test dependencies
cd tests
pip install -r requirements.txt

# Run tests
pytest -v

Integration

This plugin works with the Ledger Ethereum app. Users need:

1. Ledger device with Ethereum app installed
2. This plugin installed (via Ledger Live when available)
3. A Tempo-compatible wallet (MetaMask with Tempo network)

Connecting to Tempo

Add Tempo to MetaMask:

• Network Name: Tempo
• RPC URL: https://rpc.tempo.xyz
• Chain ID: 98985
• Currency: USD
• Explorer: https://explorer.tempo.xyz

Security

• All transactions display clear, human-readable information
• No blind signing required for supported operations
• Token symbols are verified against known addresses
• Payment memos are displayed for verification

License

Apache-2.0 - See LICENSE.md

Links

• Tempo Documentation
• Tempo Explorer
• Plugin Specification
• Ledger Developer Portal