Below are some of those things the Internet will never let the muggles find out. I have keenly been watching them with the hope that someone will one day solve them, to no avail. Feel free to add your own on the comment section.
1. Bitcoin
Bitcoin is a cryptocurrency and a digital payment system invented by an unknown programmer, or a group of programmers, under the name Satoshi Nakamoto. It was released as open-source software in 2009.
The system is peer-to-peer, and transactions take place between users directly, without an intermediary. These transactions are verified by network nodes and recorded in a public distributed ledger called a blockchain. Since the system works without a central repository or single administrator, bitcoin is called the first decentralized digital currency.
2. Internet Black Holes
In networking, black holes refer to places in the network where incoming or outgoing traffic is silently discarded (or “dropped”), without informing the source that the data did not reach its intended recipient.When examining the topology of the network, the black holes themselves are invisible, and can only be detected by monitoring the lost traffic; hence the name. This was proved in around 2008, previously they were dismissed as WIFI or server issues.
3. A858
This is the reddit user named A858DE45F56D9BC9 posts long passages of coded text on the site. A dedicated community and an automated bot have yet to solve the riddle to date.
4. 973-eht-namuh-973
It doesn’t really take a lot of time or effort to set up a website, but to make one that captivates and puzzles people for years is a different story. Since at least 2003, 973-eht-namuh-973.com has been serving up a baffling array of text, images and other mysterious content to visitors, and we’re no closer to understanding what the purpose of it all is. Closer examination of the site’s content reveals links to numerology, ancient mysticism and other unusual subjects, but the identity of the site’s creator is still not known.
References:
https://en.wikipedia.org/wiki/Bitcoin
http://www.craveonline.com/mandatory/1055510-10-internet-mysteries-that-are-yet-to-be-solved#W7jfKTjLiM4K1M55.99