Hello! I sell my idea for an idea, an animated video, a site for lending, and a white paper in 2 languages, Russian and English! Who is interested in sending a video! There everything is clear and clear what kind of idea! Video in the English language! Price 0.5 btc .... write in telegrams @zzaghaev
How can a buyer ensure there is no double spending? In other words, how can an idea be secured?