Dear @ULFEnCMICCAI2025Participants, We’re excited to announce that the validation phase of the ULF-EnC Challenge is officially open! The validation dataset has now been shared, and participants can begin evaluating their models using the provided structure. Submissions are now accepted starting today. As a courtesy (and to make up for the delay in preparation), you are welcome to submit as many validations per day as you need; there is no daily submission limit during this phase. Submission instructions and leaderboard updates are available on the challenge Synapse site. Thank you for your patience. We look forward to seeing your solutions in action! Best regards, The ULF-EnC Challenge Organizers