Backpack is a Solana-based platform that evolved from an NFT wallet and Mad Lads community project into a comprehensive brokerage combining a centralized crypto exchange, US stocks/ETFs trading, and self-custodial wallet services. Founded by Armani Ferrante (formerly at Apple and Alameda), the platform survived FTX's collapse and now emphasizes unified account margins, 24/7 real stock trading, and regulatory compliance across multiple jurisdictions.