OKX Card members who are Accredited Investors can enjoy rebates of up to 20 USDG per month (for the first 12 months) on any of the following subscriptions: TradingView, Nansen, ChatGPT, Spotify, Apple Music, Netflix, YouTube Premium, and Claude.

The zk-STARK Proof of Reserves (PoR) system leverages STARK theory, a complex mathematical solution. zk-STARK stands for: Zero-Knowledge Scalable Transparent Argument of Knowledge, a cryptographic proof technology based on Vitalik's idea to enforce the integrity and privacy of computations on blockchains. In this article, we'll introduce how it works and explain the general mathematical concept, but if you're interested in diving deeper, start here or here.How does it work?

Select USD-M settlement currency for USD futures settlement currency in USD, USDC, or USDG Deposit the selected settlement currency or other supported assets as margin.4. Can I change the settlement currency for USDⓈ futures? Yes, but you must flatten all USD futures positions and cancel all USD futures orders before you make any changes.5. Which cryptocurrencies can be used as settlement currencies in USDⓈ futures?