Glossary
Schnorr Signature
A signature scheme with linear math — multiple signatures aggregate into one — added to Bitcoin via Taproot and used in many newer protocols.
Schnorr signatures are mathematically cleaner than ECDSA: they are provably secure under standard assumptions, are not malleable, and crucially, are linear — multiple Schnorr signatures can be aggregated into a single signature that verifies as one.
Aggregation makes multi-signature transactions indistinguishable from single-signature ones, which improves both privacy and on-chain compactness. Bitcoin enabled Schnorr signatures via the 2021 Taproot upgrade, and many newer protocols use Schnorr (or its sibling EdDSA) as their default.