# Fairblock Confidential DeFi On Arbitrum *Fairates is a fixed-rate lending platform powered by Arbitrum Stylus, enabling private trading orders and auctions.* By [ETH Daily](https://ethdaily.io) · 2025-09-20 news, 2025, september2025 --- Gm frENS. Happy Friday, you made it through the week! Quick Take ---------- * Fairblock confidential DeFi on Arbitrum. * Optimism maintenance upgrade 16a. * FG Nexus holds 49,715 ETH. * Fileverse supports passkey login. * * * [ Fairblock Confidential DeFi On Arbitrum --------------------------------------- Listen to this episode from ETH Daily - Ethereum News on Spotify. Fairblock introduces its confidential DeFi app on Arbitrum. Optimism announces an incremental approach to Superchain interop. And FG Nexus holds 49,715 ETH. Read more: https://ethdaily.io/787 Disclaimer: Content is for informational purposes only, not endorsement or investment advice. https://spotify.com ![](https://storage.googleapis.com/papyrus_images/a74b5e57c4c44ae304c20cbe9ec2149d14f7010ff189513bd6953e48954ef7a0.jpg) ](https://open.spotify.com/episode/2Ucb3JlIYW928sWmx40jP7) * * * Fairblock Confidential DeFi On Arbitrum --------------------------------------- Fairblock, a confidential execution protocol, [introduced](https://blog.arbitrum.io/how-fairblock-is-unlocking-confidential-payments-and-auctions-on-arbitrum/) Fairates, its fixed-rate lending platform powered by Arbitrum Stylus. The implementation uses Stylus to run Rust-based cryptographic operations that keep sensitive computations verifiable yet private onchain. Fairblock introduces Protected Trading, where orders and auctions are encrypted until execution, ensuring fair price discovery. Fairates uses leaderless sealed-bid auctions to establish a single clearing rate, allowing borrowers and lenders to interact without slippage, manipulation, or reliance on a central auctioneer. Bids are submitted in encrypted form, and once the auction closes, validators decrypt them collectively using multi-party computation (MPC) and threshold identity-based encryption (IBE). Optimism Incremental Superchain Interop --------------------------------------- Optimism is [rolling out](https://gov.optimism.io/t/maintenance-upgrade-proposal-u16a/10288) Upgrade 16a, a maintenance upgrade that temporarily removes interop withdrawal-proving code introduced in Upgrade 16. The change follows concerns from partners, aiming to ensure stability while interop features remain under development. Upgrade 16a also introduces system-level feature toggles, enabling safer, chain-specific rollouts and paving the way for future upgrades toward native Superchain interoperability. The upgrade is scheduled for activation on October 2, 2025, pending governance approval, which is currently in progress. FG Nexus Holds 49,715 ETH ------------------------- FG Nexus, a public Ethereum digital asset treasury (DAT) company, [announced](http://globenewswire.com/news-release/2025/09/19/3153099/0/en/FG-NEXUS-ACCELERATES-TOTAL-ETH-HOLDINGS-TO-49-715.html) that it holds 49,715 ETH, valued at approximately $229 million. According to Maja Vujinovic, CEO of Digital Assets at FG Nexus, Ethereum remains the premier programmable asset for institutional reserves. The company plans to use proceeds from a recent sale to acquire additional ETH and to engage in staking, restaking, liquid staking, and DeFi strategies with the goal of increasing its ETH per share. FG Nexus is listed on the Nasdaq under the ticker FGNXP and currently ranks as the 14th-largest corporate holder of ETH. Other News ---------- * Top L2s [consuming](https://x.com/growthepie_eth/status/1969022907046109415) blobs * Bitmine [buys](https://x.com/CryptoGucci/status/1969112196085952739) 15,427 ETH * Stablecoin supply [hits](https://x.com/tokenterminal/status/1968998980571791817) ATH * Fileverse [supports](https://x.com/fileverse/status/1969045666409189659) passkey login * $213m ETH ETF [net flows](https://x.com/FarsideUK/status/1968884735557402848) * DD [DevConnect Giveaway](https://x.com/developer_dao/status/1967559043914080569) * Synthetix on [returning](https://x.com/synthetix_io/status/1968811886281171392) to L1 * NFT Strategy [live on mainnet](https://x.com/token_works/status/1969088128255209641) * ETH Strategy PN week 3 [recap](https://x.com/eth_strategy/status/1969144486942163248) * The Rollup [live with](https://x.com/ethdaily/status/1969119877752402123) Tim Beiko * Composability [Space](https://x.com/mteamisloading/status/1969065893482180895) w/ Justin Drake * Whiteboard to Mainnet [episode 2](https://x.com/ethereumfndn/status/1960532962933661875) * Edge City [residency list](https://x.com/JoinEdgeCity/status/1969128009031467369) That's it for this week! If you enjoyed the read, please support us with a [**donation**](https://giveth.io/cause/ethereum-education) 🌱 * * * Disclaimer: Content is for informational purposes only, not endorsement or investment advice. The accuracy of information is not guaranteed. --- *Originally published on [ETH Daily](https://ethdaily.io/787)*