South Korean cryptocurrency exchange Upbit has initiated a temporary suspension of deposit and withdrawal services for Sei (SEI), a blockchain network engineered for high-speed trading execution. This operational pause is scheduled to commence at 9:00 a.m. UTC on May 19, directly coinciding with a planned network upgrade. Such upgrades represent routine yet critical milestones for blockchain infrastructure, frequently introducing new protocol features, enhancing security postures, or improving scalability metrics. During these maintenance windows, exchanges universally suspend token movements to mitigate the risk of transaction failures or potential loss of user funds. For SEI holders utilizing Upbit, this directive means that no incoming or outgoing transfers will be processed throughout the designated maintenance period. According to Upbit's official notice, the suspension takes effect precisely at 9:00 a.m. UTC on May 19, with the exchange refraining from specifying an exact resumption time while advising users to monitor subsequent announcements. Woofun AI reports that while the trading of SEI on the platform may continue uninterrupted during this suspension, users will be unable to move tokens into or out of their Upbit wallets. Users requiring the transfer of SEI tokens must complete all transactions prior to the May 19 deadline to avoid being locked out of the network during the upgrade. Upon completion of the network upgrade, Upbit intends to resume normal deposit and withdrawal services, likely accompanied by a separate official announcement. It remains advisable for market participants to check Upbit's official channels for real-time updates regarding the maintenance status. The temporary suspension of SEI deposits and withdrawals on Upbit constitutes a standard operational measure designed to ensure a seamless network upgrade. Woofun AI notes that while the halt may cause minor inconvenience to liquidity flows, it is fundamentally designed to protect user assets and maintain overall network integrity. SEI holders should plan their asset movements accordingly and stay informed through Upbit's official communications to navigate this transition effectively.