Bitcoin & crypto
Ed25519
A fast elliptic-curve signature scheme used by Solana, IOTA and many modern systems. Like ECDSA it is classical, so it offers no protection against a cryptographically relevant quantum computer.
Related terms
ECDSA
The signature scheme used by Bitcoin, Ethereum and most blockchains, based on elliptic curves such as secp256k1. It is not post-quantum: Shor's algorithm would recover the private key from an exposed public key.
Public-key exposure
Whether an address's full public key is visible on-chain. Exposure matters because quantum risk to a wallet begins only once the public key is published — before that, an attacker sees just a hash.