Metaplex introduces MPL-3643 standard for tokenized securities on Solana

This matters for firms and users working with permissioned real-world assets on Solana, because the framework already defines eligibility, jurisdiction, and transfer controls in one place. Anyone looking to issue or manage tokenized securities on that chain will notice that MPL-3643 exists now, even though it is still limited-access alpha.

Before this, there was no MPL-3643 standard named here for tokenized securities on Solana; now there is a defined framework for those assets with built-in controls. What remains the same is that it is still only in limited-access alpha, so the practical scope described here is not broad public deployment yet.