Arc 3 Catch-Up: Solana Transactions Explained for Web2 Developers

Arc 3 of 100 Days of Solana was the arc where Solana stopped being something we read from and started being something we wrote to . Across the arc, we inspected transactions, sent SOL on devnet, built a transfer tool, tracked confirmation, and deliberately triggered failures. That shift changes how everything else fits together: accounts, programs, fees, confirmation, errors, and application state. They all hang off one idea: A Solana transaction is a signed request to change on-chain state. Rea