A large alleged pyramid scheme marketed as cryptocurrency education and coin, prosecuted across multiple countries.

The number of derivative contracts still outstanding. Rising open interest means new risk is entering.

Client code you can audit. Still verify downloads and reproduce builds when possible.

The largest NFT marketplace by historical volume, a Web2 company on top of on-chain transfers.

Losses from compromised signer devices, fake UI, or social engineering rather than a smart-contract bug. Central to Bybit-era exchange thefts.

An Ethereum scaling ecosystem that develops the OP Stack; OP Mainnet is a particular network built with that stack, and other deployments have their own network configuration.

A scaling system that publishes transaction data and accepts state claims subject to a dispute process, allowing incorrect claims to be challenged before settlement under the protocol's rules.

A system design in which users or wallets can choose between transaction paths that reveal different amounts of information, making privacy depend on both protocol rules and actual usage.

Contracts that give the right, but not the obligation, to buy (call) or sell (put) at a strike price.

A service that brings off-chain data (prices, scores, randomness) onto a chain in a form contracts can read.

A configured update interval that can trigger a price feed report even when the observed price has not crossed its deviation threshold.

A list of resting bids and asks on an exchange. The engine matches incoming orders against that book.

Over-the-counter trading arranged away from a public book, used by large tickets that would move a screen.