A whistleblower who works in Project Nightingale, the secret transfer of the personal medical data of up to 50 million Americans from one of the largest healthcare providers in the US to Google, has expressed anger to the Guardian that patients are being kept in the dark about the massive deal. The anonymous whistleblower has posted a video on the social media platform Daily Motion that contains a document dump of hundreds of images of confidential files relating to Project Nightingale. The secret scheme ... involves the transfer to Google of healthcare data held by Ascension, the second-largest healthcare provider in the US. The data is being transferred with full personal details including name and medical history and can be accessed by Google staff. Unlike other similar efforts it has not been made anonymous through a process of ... de-identification. The disclosed documents include highly confidential outlines of Project Nightingale, laying out the four stages or pillars" of the secret project. By the time the transfer is completed next March, it will have passed the personal data of 50 million or more patients in 21 states to Google, with 10 million or so files already having moved across - with no warning having been given to patients or doctors. Google has entered into similar partnerships on a much smaller scale with clients such as the Colorado Center for Personalized Medicine. But in that case all the data handed over to the search giant was encrypted, with keys being held only on the medical side.