Ruby Protocol is a privacy-centric programmable access control middleware for Web3. Their solutions and products include private tokenization, private payment bridge, authentication, and account/sub-account systems. They utilize zero-knowledge proofs algorithms, decentralized key management, abstract account-based access control, and interoperability to provide privacy and security in the Web3 ecosystem. Ruby Protocol has raised significant funding from renowned backers and is poised to become a leading privacy protocol for Web3.