Yeah that should work. If I do 1 request per second with 64 IP addresses, I'd expect to find ~110 videos after 1 year of random sampling if there are 1T videos

Yeah that should work. If I do 1 request per second with 64 IP addresses, I'd expect to find ~110 videos after 1 year of random sampling if there are 1T videos on YouTube. 110=(64*3.154e+7)*(1,000,000,000,000/2^64) (The other thread that assumes a 62-character set is wrong because they forgot about '-' and '_'. I'm fairly certain a video ID is a urlsafe base64 encoded 64-bit int. 64^11==2^66)