nhash is a blossom hash of a video file's merkle root + decryption key. /video.mp4 is a filename hint. It's viewable on Iris or https://files.iris.to/#/nhash19j2003959cltp77c7dnlwrfwawqgleju7ethswdsr3q8e8y0xj5qyh4lf9/video.mp4