Bro Bro is an open peer-to-peer application protocol that lets anyone pay bills using Bitcoin over the Lightning Network. Initially available for PIX and Boleto in Brazil; CoDi in Mexico; PromptPay in Thailand; Transferencia 3.0 in Argentina; Bre-B in Colombia. All communication is end-to-end encrypted (NIP-44) and travels through decentralized Nostr relays — no central server, no accounts, no KYC. Features: Self-custodial Lightning wallet (Breez Spark SDK) Multi-currency P2P marketplace BRIX Lightning Address (receive Bitcoin via phone or email) QR code scanner Real-time order tracking Collateral tiers and AI-assisted dispute resolution Login with Nostr key (nsec) or BIP-39 seed