Part 5/7:
According to a 2018 blog post from Chainalysis, there are approximately 172 million wallet addresses with potential to hold Bitcoin funds. However, most of these addresses—around 147 million—are owned by services such as exchanges or businesses and likely utilize multi-signature wallet structures, requiring several private keys to access.
This scenario leaves only about 25 million wallets belonging to individual holders of Bitcoin. While this marked reduction in potential targets makes it seem easier to generate a matching private key, the odds remain unfathomably low—specifically, 1 in 5.8 nonillion.