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Layer 2 & scaling
A layer 2 executes transactions somewhere cheaper and posts the result back to a base chain. The interesting question is never the throughput number — it is what exactly gets posted back, and how long it takes before it cannot be reversed.
Optimistic rollups assume the posted result is correct and leave a window for anyone to prove otherwise. Zero-knowledge rollups prove correctness up front, at the cost of much heavier computation. The difference shows up as a withdrawal delay measured in days versus minutes.
Sidechains are a third thing entirely: they have their own validators and inherit nothing from the base chain but a bridge. They are usually cheaper still, and the bridge is where the risk concentrates.
15 coins
| # | Coin | Price | 24h | 7d | Market cap | 24h volume |
|---|---|---|---|---|---|---|
| 11 |  ZcashZEC | $812.84 | ▼ −0.9% | ▲ +3.2% | $13.7B | $637.7M |
| 37 |  OKBOKB | $105.48 | ▼ −4.4% | ▼ −5.7% | $2.22B | $26M |
Market data as of 41 min. ago
