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防曬霜是一個專為新型網路設計的隱私引擎，提供完整的全同態加密（FHE）編譯器與安全處理框架。其核心業務是讓開發者使用C語言等標準程式語言編寫具隱私保護功能的智慧合約，編譯器會自動將加密資料操作轉換為可執行二進位檔。這些二進位檔在名為Parasol的虛擬處理器上執行，該處理器專為TFHE（環面全同態加密）方案最佳化，可支援AI模型中的分支結構與激活函數等任意邏輯。 此方案解決的市場痛點在於區塊鏈固有的透明性——交易策略、身分資訊或代幣化資產持有量等敏感數據皆會公開暴露。防曬霜無需依賴可信硬體，僅憑數學機制即可實現加密計算。其競爭優勢在於鏈無關設計：安全處理框架將計算與共識解耦，透過簡單的操作即可將相同的加密工作負載部署至以太坊、Arbitrum或其他區塊鏈，並以零知識證明確保執行可驗證性。 在過去六個月（2026年3月至9月）間，防曬霜於7月初被Fhenix收購，創辦人Ravital Solomon加入團隊主導密碼學研究。此次收購將TFHE、BFV及後量子格密碼學整合為統一堆疊，目標是在以太坊、Arbitrum和Base上部署抗量子隱私層。編譯器路線圖從BFV轉向TFHE以獲得更深層的計算能力，並釋出Python用戶端以利於本地或伺服器端測試。目前仍存在顯著限制：TFHE運算速度緩慢（基本操作每筆需1-10毫秒）且僅支援CPU，缺乏GPU加速，限制了大型AI工作負載的擴展性。
Sunscreen was acquired by Fhenix on July 2, 2026 for an undisclosed sum, with founder Ravital Solomon joining Fhenix to lead cryptographic research. Sunscreen had raised about $5.17 million, backed by Coinbase Ventures, Polychain, dao5 and Northzone.
After the deal the two teams merged their TFHE and BFV compiler paths, folding Sunscreen's Parasol compiler and bring-your-own-program model into Fhenix's CoFHE stack for encrypted computation on the EVM.
Next Sunscreen plans to deploy a quantum-resistant privacy layer across Ethereum, Arbitrum and Base, researching threshold FHE decryption, exact arithmetic and confidential on-chain data processing for finance, payments, identity and AI.
Ravital Solomon — Co-founder & CEO; MSc in Mathematics and Theoretical Computer Science from Oxford; former cryptographer at NuCypher; founded Sunscreen in 2021 and later joined Fhenix with the team to build privacy infrastructure.
MacLane Wilkison — Co-founder; co-founder of NuCypher; now advises Sunscreen.