How to use Segwit with Electrum and Trezor - Step by Step Guide

First of all, download the new Electrum from their website. Make sure you are using the right address, electrum.org, to avoid installing malware on your computer. After installation, run the application. Import your account info as a new wallet. Electrum handles TREZOR accounts as separate wallets. To add your new account, you will therefore have to create a new wallet — choose File-New. Pick the name for your wallet and in the next window, select ‘Standard wallet’. When selecting Keystore, the place where your private keys are stored, make sure to choose ‘Use a hardware device’. Before clicking on next, plug your TREZOR in. In the next window, select the TREZOR you want to use. (If the device is not recognized, try again. Sometimes it takes a while for Electrum to discover TREZOR. Also try closing TREZOR Wallet or any other apps connected to the device.) Looks good! Click on next. In the next window enter your PIN (and passphrase) and confirm. Note that by doing this you are not exporting your private keys. TREZOR will never leak your confidential data. Okay, now here, make sure you change the derivation path. TREZOR uses BIP49 for new SegWit accounts, therefore the first account is m/49’/0’/0’. Iterate the last number to get the next account. (If you want to import more accounts, for each you will need to create a new wallet in Electrum though.) Here is a list of example derivation paths for BIP49, to use new accounts. m/49'/0'/0' (first account)m/49'/0'/1' (second account)m/49'/0'/2' (third account)... If you would rather use legacy accounts, use BIP44 paths. m/44'/0'/0' (first account)m/44'/0'/1' (second account)m/44'/0'/2' (third account)... Click on ‘Next’ and you are done! You are ready to use TREZOR with Electrum! All addresses are properly generated, SegWit accounts with a 3-address. You can check them against the addresses in TREZOR Wallet, in case you want to be completely sure. And that’s it! You can now use Electrum with TREZOR as the signing device.