Glossary
Native Bridge
The bridge built into a rollup's own contracts on L1 — the slowest path for L2→L1 withdrawals but the most trust-minimized one.
Every rollup ships a native bridge as part of its core contracts. Deposits from L1 to L2 are usually fast; withdrawals from L2 to L1 inherit the rollup's full security delay — seven days for an optimistic rollup's challenge window, a few hours for a ZK rollup's proof posting.
Third-party "liquidity bridges" (Across, Hop, Stargate, Connext, Synapse) front users the funds on the destination chain and reclaim them later from the native bridge. They trade trust for speed; the native bridge is the canonical, slowest, safest path.