Sei 警告 USDC.n 持有者必須在 3 月 SIP-3 升級前換原生 USDC，否則恐失去價值。USDC.n 透過 Noble 橋接，價值 140 萬美元。升級後 Sei 轉 EVM 棄 Cosmos。小額用 DragonSwap 或 Symphony，大額用 Brr 工具批量處理。
USDC.n 與原生 USDC 的技術差異
USDC.n，也稱為透過 Noble 發行的 USDC，是 Sei 網路上流行的 USDC 穩定幣的舊版本。USDC 最初由 Circle 在 Noble 區塊鏈上發行，並透過橋接連接到 Sei。在 Circle 將 USDC 原生發行到 Sei 之前，USDC.n 一直是該網路上的主要 USDC 版本。
Noble 是一個由 Cosmos 支持的應用鏈，專為在 Cosmos/IBC 生態系統中發行原生資產而設計。該網路充當穩定幣發行方（包括 Circle、Hashnote Labs、Monerium 和 Ondo Finance）與 Cosmos 區塊鏈之間的中介，幫助這些發行方將其穩定幣上線到基於 Cosmos 的區塊鏈上。
這種橋接架構的優勢是快速部署，缺點是增加了技術複雜度和安全風險。每多一層橋接，就多一層潛在的漏洞和故障點。原生 USDC 則是 Circle 直接在 Sei 鏈上發行，無需經過 Noble 中介，技術架構更簡單，安全性更高，也是 Circle 官方認可的唯一版本。
目前透過 Noble 在 Sei 上持有的 USDC 價值約為 140 萬美元，低於之前的數百萬美元，因為用戶繼續將 USDC 兌換成 Sei 的官方穩定幣版本。這種持續下降的趨勢顯示，多數用戶已意識到 USDC.n 的過渡性質，正在主動遷移。然而，仍有 140 萬美元的持有者可能未注意到這個警告，面臨資產無法訪問的風險。
USDC.n 與原生 USDC 的四大差異
發行方式：USDC.n 透過 Noble 橋接，原生 USDC 由 Circle 直接發行
技術架構：USDC.n 依賴 IBC 跨鏈，原生 USDC 無需橋接
安全性：USDC.n 多一層橋接風險，原生 USDC 更安全
升級兼容性：USDC.n 不兼容 SIP-3 升級，原生 USDC 完全支持
SIP-3 升級的技術轉型與影響
今年 3 月，Sei 將推出重要的 SIP-3 升級，透過棄用其 CosmWasm 和 Cosmos 原生資產，完全過渡到僅支援 EVM 的鏈。這是 Sei 技術路線的重大轉型，從 Cosmos 生態轉向以太坊虛擬機生態。這種轉型的動機是吸引更多以太坊開發者和應用遷移至 Sei，因為 EVM 是當前智能合約開發的事實標準。
Sei 寫道：「升級後，USDC.n 可能無法訪問或在 Sei 網路上失去其價值。」這句警告極為嚴厲，意味著持有 USDC.n 的用戶若不及時兌換，可能面臨資產歸零的風險。技術上，升級後 Sei 將不再支援 IBC 跨鏈通信協議，而 USDC.n 正是依賴 IBC 從 Noble 橋接過來的，因此將無法在新架構中運作。
該專案建議使用 DragonSwap 或 Symphony 進行「小額」轉換。對於大額持有者，則建議使用 Brr 上的轉換工具，該工具可將 Noble 到 Polygon 的交易批量處理，並「最終使用 Circle 的 CCTP 轉換回 Sei 網路」。這種操作流程相當複雜，涉及多鏈跨越，對於不熟悉 DeFi 操作的用戶而言具有一定門檻。
小額與大額的區分標準未明確公布，但通常數千美元以下可視為小額，數萬美元以上應採用 Brr 工具以降低滑點和手續費。
Circle 投資背後的戰略布局
Circle Ventures 在 2023 年底向 Layer 1 Sei 網路投資了一筆未公開金額的資金，此前不久該公司與 Noble 達成合作，使其成為 Noble 在 Cosmos 生態系統中發行 USDC 的主要資產部署網絡。去年，Noble 選擇了新興穩定幣專案 M^0 為其原生 USDN 美元掛鉤代幣提供支援。
Circle 投資 Sei 的戰略邏輯是確保 USDC 在新興高性能公鏈上的主導地位。Sei 以其高速交易確認和低手續費吸引 DeFi 項目，Circle 透過直接發行原生 USDC，避免了橋接的技術風險和用戶體驗問題。這種戰略在 Solana、Avalanche 等鏈上都有類似布局。
從更廣泛的視角看，USDC.n 到原生 USDC 的遷移，反映了整個加密產業從「橋接為主」到「原生部署為主」的技術演進。早期由於各鏈孤立，橋接是唯一解決方案。但隨著發行方願意在多鏈原生部署，橋接的必要性降低，安全性和用戶體驗都得到提升。
對於 USDC.n 持有者而言，當前最緊迫的任務是在 3 月升級前完成兌換。拖延可能導致資產無法訪問，即使 Circle 和 Sei 願意事後提供救援方案，流程也將極為複雜且耗時。及早行動是保護資產的唯一選擇。
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