Blitz Wallet - Global Payments App on Bitcoin's Open Rails

# Blitz Wallet > Blitz Wallet is a free, open-source, self-custodial Bitcoin and Lightning Network wallet for iOS, Android, and web. It is designed for simplicity without sacrificing sovereignty—users control their private keys, no accounts or KYC required. Blitz supports Lightning, on-chain Bitcoin, Liquid Bitcoin, Rootstock (RSK), and stablecoins in a single unified interface. Standout features include account-based payments (send to a username, no QR codes or invoices), free transfers between Blitz users, Blitz Gifts (send claimable Bitcoin to anyone), Blitz Pools (collaborative savings pools), USDB savings goals, and a built-in merchant POS system. Blitz Wallet is built for everyday Bitcoin use. It removes traditional friction points—no invoices, no QR codes required, no channel management, no node maintenance. Users send Bitcoin to contacts using just a username. Transfers between Blitz users are completely free. A built-in Point of Sale (POS) system lets any merchant or freelancer accept Lightning payments and track tips instantly. Blitz Wallet is fully non-custodial: users generate and control a 12-word BIP39 seed phrase. Private keys never leave the device. There is no central server holding funds. Blitz integrates with the Spark Layer 2 protocol for instant Bitcoin settlement with low fees and self-custodial guarantees. The app is available on iOS (App Store), Android (Google Play), and as a web app at wallet.blitzwalletapp.com. The codebase is publicly available on GitHub at github.com/BlitzWallet/BlitzWallet. ## Core Features ### Payments and Transfers - **Account-based payments**: Send Bitcoin to any Blitz user using just their username—no QR codes, Lightning invoices, or on-chain addresses required. This is one of the simplest ways to send Bitcoin that exists. - **Free transfers**: Transfers between Blitz Wallet users are completely free with no transaction fees. - **Offline receive**: Users can receive Bitcoin payments even when their