Electrum 4.0.1 Major Release

July 3, 2020

Key Features:

Experimental Lightning Network support
- Server-based channel state queries
- Static channel backups required
- Lightning wallets incompatible with Electrum Personal Server
- New backup procedures for lightning-enabled wallets
- Available for HD p2wpkh wallets on Qt GUI, CLI/RPC, and Kivy (Android)
- Implements dataloss_protect, static_remotekey, varonion, and payment_secret
- Integrated submarine swap service
- Local and remote watchtower functionality
PSBT (BIP-174) support (#5721), replacing previous partial transaction format
Hardware wallet enhancements:
- BitBox02 support added (#5993)
- Coldcard multisig capability (#5440)
- Latest Trezor firmware compatibility (#6064, #6198, #5692)
Dependency changes:
- libsecp256k1 now required
- pycryptodomex or cryptography required
- jsonrpclib-pelix removed
Qt GUI improvements:
- Redesigned transaction creation workflow
- Enhanced coin selection functionality
- Editable transaction preview
Simplified HTTP PayServer configuration with BIP70 and Lightning support
Android updates:
- Separate APKs for ARMv7 and ARMv8
- BIP39 seed import in Kivy GUI
- Individual wallet encryption with optional shared PIN
CLI/RPC command API changes and additions
Distribution improvements:
- Reproducible .tar.gz source distribution
- Notarized MacOS binary (minimum macOS 10.13)
Transaction enhancements:
- Low R grinding for ECDSA signatures (#5820)
Numerous minor bug fixes and improvements