Transfer Fees, Metadata, and Soulbound Tokens: A Tour of Solana Token Extensions

I spent the last five days building tokens on Solana — and it completely changed how I think about what a "token" actually is. Coming from Web2 and EVM development, I assumed a token was a number in a database with some transfer logic wrapped around it. On Solana, it's much closer to a configurable protocol object. Here's everything I learned across Days 29–33 of my #100DaysOfSolana challenge. The Starting Point: Two Token Programs Solana has two token programs: SPL Token (original) — simple, ba