Announcement on Optimization of Sweeping Transaction Signing for Portal MPC Wallet (Cobo Guard Node)

Dear Cobo User,

To enhance overall system efficiency and improve transaction processing stability, we will optimize the sweeping transaction signing mechanism for the Cobo Guard node in the Portal MPC Wallet as follows:
When a sweeping transaction uses Guard signing, if the signature is not completed within 24 hours, the transaction will be automatically marked as failed.

Impact:
If a sweeping transaction remains unsigned for an extended period, it may occupy transaction queue resources and affect the execution efficiency of subsequent transactions.
Please complete the signing in a timely manner to avoid any impact on asset sweeping and normal transactions.

Thank you for your understanding and cooperation. If you have any questions, please feel free to contact us.

Cobo Support
April 3, 2026