This week I built custom SPL tokens on Solana using the Token Extensions Program. I created tokens with on-chain metadata, configured protocol-level transfer fees, and even experimented with non-transferable (soulbound) tokens.
The most interesting moment was testing a non-transferable token and watching the blockchain reject the transfer attempt automatically. Seeing the protocol enforce the rule itself — without any custom backend or off-chain validation — completely changed how I think about token design.
I also explored transfer fee extensions and learned how economic rules can be embedded directly into the token standard instead of being handled by application logic.
Next week I'm diving deeper into how these token extensions interact with on-chain programs and real-world applications built on Solana.
All code is open source and documented as part of my learning journey:
GitHub: https://github.com/Siddhant0122/100-days-of-solana
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