Solana Token-2022 Extensions Enable Interest, KYC Controls, and Digital Credentials

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A developer exploring Solana's Token-2022 Program discovered three extensions that expand what blockchain tokens can do beyond simple value transfers. The Interest-Bearing Extension allows wallet balances to display accrued interest over time without altering the raw on-chain data, mirroring how banking apps work. The Default Account State extension lets issuers freeze new token accounts by default, enabling KYC-style approval workflows similar to regulated financial systems. By combining Non-Transferable, Permanent Delegate, and Metadata extensions, the developer built a revocable digital credential that stays bound to one wallet yet can be recalled by the issuer, modelling real-world certificates or employee badges. The experiments led to a broader insight that Solana tokens can serve as programmable assets representing financial products, regulated instruments, and digital identities.

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