To be used in the real world, Web3 needs user-enabled privacy and comprehensive security. Independent verifications of open source systems are necessary for improving security, along with promoting transparency and building a foundation for widespread use. The decentralization movement requires rethinking how our systems work to effectively shift the responsibility - through security by design, not security by policy. Innovations in advanced cryptography can help us to compute and prove details without sharing the data. And only with transparent, secure systems at the protocol, service and application levels, can we enable the privacy we need to control our most valuable information.