What are Schnorr signatures?

What makes Schnorr signatures unique is their ability to combine multiple signatures into one compact signature, known as signature aggregation. This feature not only reduces transaction sizes and associated fees but also enhances privacy by making it difficult to distinguish between single-signature and multi-signature transactions. Additionally, Schnorr signatures are resistant to signature malleability, improving security and simplifying the implementation of certain blockchain protocols. Another advantage is their ability to be verified in batches, reducing the computational load on network nodes. Schnorr signatures also support key aggregation, allowing multiple public keys to be combined into one, further enhancing privacy and efficiency in multi-party transactions. Overall, Schnorr signatures offer simplicity, provable security, and have been widely adopted in blockchain networks like Bitcoin and the Internet Computer Protocol (ICP), where they have improved efficiency, privacy, and cross-chain interactions.