The RenProject vault page states that users should bridge back any assets such as renBTC to their respective native chains before 20th December 2022, as Ren 1.0 will be sunset by then. This means that any assets stored in the RenProject vault will no longer be accessible after this date, so users should take action to ensure that their assets are not lost. Additionally, the page states that the vault has been paused, meaning that no new assets can be stored in the vault at this time. It is important for users to understand these important dates and take the necessary steps to ensure that their assets are safe.