Around 2012. My friend who started a business with me was mining every day. I thought he was playing games. Not sure.

He played around for a few days. Later, it was left unresolved.

Then in 2017, a friend bought a mining machine. I remember it was over 30,000 each. He placed it at home. It was running every day. After about half a year, he sold it at a low price. Later, whenever I mentioned mining machines or coins, he would get angry. Then a few months after he bought the mining machine, I bought some coins with cash.

In the first half of 2018, ICOs and all kinds of coins were booming. As long as there was a concept, it was popular. If there was no concept, they would create one. As long as you dared to think, I thought at that time it was the Year of the Dog, so I bought some Dogecoin. On the day I bought it, I even posted on social media. In no time, a friend asked me what a coin was. Usually had a good reputation. An acquaintance in the circle tried it out and bought 10,000 yuan worth. He didn't know how to operate anything. He bothered me for half a day. He bought 1,000 of each coin. He also bought Dogecoin... Later, there was a major drop. Once it dropped, he changed his holdings. Eventually, the excitement was gone. In 2019, a classmate called me to Chengdu to find electricity and open a mining farm. My classmate probably didn't understand it either, or for other reasons. I found connections, but the electricity price they quoted was too different from what my classmate gave me. During those few days of networking, around April 2019, BTC was 26,000 yuan. I thought it would drop further. Later, I couldn't find electricity, so I left Chengdu. Chengdu was really fun...

At the end of 2020, I needed money. I thought there was still some cash in coins. So I opened my account and looked. It seemed to have bounced back a bit. I had to sell some, including Dogecoin. By early 2021, my goodness. Dogecoin had risen by a thousand times. I almost missed getting rich. I posted on social media to commemorate it. That guy who bought 10,000 coins saw my post and remembered he also had Dogecoin. Initially, the 1,000 yuan Dogecoin was now worth 300,000. He immediately sold it and added some money to buy a BMW. I asked him why he was in such a hurry to sell. He said it was a profit anyway; he wasn't greedy. He sold it for about a week. His Dogecoin had risen another two times. If he hadn't sold, he could have bought a BMW 740 outright. I told him about this and made him regret it. But he didn't care at all. Then on May 19th, there was a major drop... This is the first time I saw someone who could really make money, maybe it's just this kind of person.