Oracle Corp. is weighing a proposal for a sale of TiKTok’s US operations that would have it provide security assurances and take a small stake in a new American entity while potentially leaving the app’s influential algorithm in Chinese hands, according to people familiar with the matter.A proposal was circulated within the Trump administration last week that would have Oracle work with US buyers to vouch for the safety of users’ data, according to the people, who discussed the plan on condition...