During the last few days of the 100 Days Of Solana challenge, I explored one of the most interesting features of Solana's Token-2022 Program: extensions . If you're coming from Web2, think of Token-2022 extensions like middleware. Instead of creating an entirely new token standard every time you need a new feature, you simply enable additional behaviors on a mint. The token keeps following the SPL Token standard while gaining new capabilities such as transfer fees, interest-bearing ba...