The present disclosure relates to a computer implemented method for executing an application. The method comprises: executing a bootloader in a trusted execution environment, wherein the executing comprises: decrypting received encrypted secrets using decryption keys of the boot loader, storing the decrypted secrets in a storage accessible by the application, creating a proof record indicating the application, the secrets and the trusted execution environment, storing the proof record in the storage, and deleting the decryption keys. The application may be executed in the trusted execution environment using the decrypted secrets. The proof record may be provided by the application for proving authenticity.