EdDSA (Edwards-curve Digital Signature Algorithm) is a public-key signature system that uses twisted Edwards curves for cryptographic operations. It is designed to provide high performance and strong security, and is widely used in blockchain and cryptocurrency applications. One of the most popular variants is Ed25519, which is based on the Edwards25519 curve.

EdDSA signatures are typically 64 bytes long, consisting of two 32-byte components. The algorithm is known for its resistance to signature malleability and its efficient verification process. EdDSA is supported by several blockchain platforms, including Solana, Polkadot, Stellar, Sui, and others, due to its security and efficiency advantages over older algorithms like ECDSA12.