What is the rarest thing to mine?
As someone delving into the world of cryptocurrency and blockchain mining, I'm curious to know, what exactly is the rarest item or coin to mine out there? Are there specific algorithms or protocols that make certain digital assets significantly harder to obtain than others? Could you elaborate on the factors that contribute to the rarity of mined items, and perhaps even give an example or two of the most sought-after but difficult-to-mine cryptocurrencies?