In Web3, custody means control. And control begins with a string of words: your seed phrase. Structure:The seed phrase (BIP39) is the root of your private keysThe private key enables signing, proving, and recoveringWallets like MetaMask, Phantom, and Rabby generate keys from seedsCommon user errors include reusing keys, storing screenshots, and phishing attacksFuture of key custody: MPC, social recovery, AA wallets, passkeysQuote:“He who holds the keys, holds the coins.”**Closing:**Understand...