How Wallets Sign Every Transaction, Simply Explained (with Coinbase Developer APIs)

Oct 16, 2025 · 7 min read · How Audu Frank sent $5 worth of ETH to Musa, and how wallets sign transactions under the hood (with Coinbase APIs as a demo). When Audu Frank hit “Send” on his crypto wallet, transferring $5 worth of Ethereum to his friend Musa, something quietly ex...