Cryptography plays a prominent role in today’s increasingly digital society. In fact, virtually all existing systems rely on cryptography at their core. Therefore, it is utterly important to build and analyze cryptographic protocols to secure real world systems. In this talk, I will share my vision for establishing secure and privacy-preserving blockchain applications through cryptographic protocols by showcasing examples of my work in the field. As an example, I will present our research on adaptor signatures, a novel cryptographic scheme that binds the creation of a digital signature to the knowledge of a cryptographic secret other than the signing key. In the realm of blockchain-based systems, the adaptor signatures scheme has become the building block for many blockchain applications proposed so far. Finally, I will conclude by highlighting my ongoing research efforts and future research directions.