> ## Documentation Index > Fetch the complete documentation index at: https://seilabs-docs-evm-cookbook.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. > Comprehensive guide to Hardware Wallets on Sei. Learn key concepts, commands, and best practices. # Hardware Wallets Manual signing, or signing with a hardware wallet such as Ledger, keeps transaction approval secure. To sign Sei transactions, install the Ethereum app (or the dedicated Sei app) on your Ledger device. Then sign through an EVM wallet such as MetaMask. The legacy flow that used the Cosmos app with a Cosmos RPC endpoint is deprecated. Per [SIP-03](/learn/sip-03-migration), Cosmos-native interfaces were scheduled for deprecation on June 15, 2026. If you still hold funds on a Ledger Cosmos-app (`sei1...`) account, see [Migrating a hardware or mnemonic-only wallet](/learn/sip-03-migration#migrating-a-hardware-or-mnemonic-only-wallet). ## Using MetaMask with Ledger To connect your Ledger device through MetaMask and sign transactions: 1. **Install MetaMask**: Make sure that MetaMask is installed in your browser. 2. **Connect Ledger**: Open MetaMask and go to the account options. Then select **Connect Hardware Wallet**. 3. **Follow instructions**: Follow the on-screen instructions to connect your Ledger device and select the account that you want to use. 4. **Sign transactions**: After you connect, you can sign transactions directly through MetaMask with your Ledger device. **Installing the Ethereum app on Ledger** To sign transactions through MetaMask with your Ledger device, you need the Ethereum app on the device. You can install it through Ledger Live: • [Ledger App Store - Ethereum App](https://www.ledger.com/coin/wallet/ethereum) Alternatively, you can install the dedicated Sei app from the Ledger Live App Catalog. For step-by-step instructions, see [Ledger Setup](/learn/ledger-setup). This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.