TikTok tells Republican senators how it plans to hide US data from China.

TikTok provided US lawmakers with more details in a letter Thursday about how it plans to keep US user data separate from ByteDance, its Chinese parent company, in an effort to allay concerns that the video app poses a national security risk.

In a letter to nine Republican senators, Show Zi Chu, TikTok’s chief executive, explained how the company will operate the app from servers controlled by Oracle. US cloud computing giant. TikTok will be launched from the machines of an American company and verified by a third party. Chu said. He also reiterated the plan to keep US users’ personal information in Oracle rather than TikTok’s servers.

“We know we are one of the most rigorously vetted platforms in terms of security, and we are committed to removing any doubts about the security of user data in the US,” Chu wrote in a letter obtained by The New York Times.

TikTok, which is very popular for its short and viral meme-making videos, is working to debunk fears that it poses a national security risk. For years, critics of the app have worried that the Chinese government will request American-owned data directly from ByteDance and that TikTok is under the influence of the Chinese Communist Party.

In 2020, President Donald J. Trump cited these concerns and demanded that ByteDance sell TikTok if the app remained on US app stores. His administration later announced a deal in which ByteDance would sell at least part of TikTok to Oracle, although the deal never went through.

TikTok remains under scrutiny by the Committee on Foreign Investment in the United States, a group of government agencies that vet foreign purchases of US companies.

Last month, BuzzFeed News informed that ByteDance employees had access to the app’s data as recently as this year, and that the staff had struggled to cordon off the information collected by the app.

After the report, nine Republican senators, including Marsha Blackburn of Tennessee and John Thune of South Dakota, posted on tiktok with questions about his practice. Last month, FCC member also Apple and Google said should remove TikTok from their app stores.

In a letter to Chu, responding to Republican senators, he said that ByteDance employees in China can only access TikTok data if “subject to a set of strong cybersecurity controls and authorization assertion protocols monitored by our security team in the USA”.

He also reaffirmed the company’s hope that it will soon be able to remove the US data from its servers and store the information entirely in Oracle. (Some details of his plans were first reported by BuzzFeed.)

“We have not spoken publicly about these plans out of respect for the confidentiality of interactions with the US government, but circumstances now require us to make some of this information public in order to eliminate errors and misconceptions in the article, as well as some ongoing issues related to other aspects of our business,” he said.

But Mr. Chu also made it clear that the ByteDance staff in China would still be working on TikTok. Those employees could still develop an algorithm that would provide personalized video recommendations to TikTok users, he said, although Oracle “ensures that learning the TikTok algorithm” only happens on its servers.

And certain information, such as public videos and comments, will remain available to ByteDance employees on terms approved by the US government, he wrote, to “ensure global compatibility so that our US users, creators, brands, and merchants can enjoy the same rich and secure TikTok. . experience as global users.