$BTC 2018 The year 2018 saw Bitcoin plummet from $20,000, and there was an American hedge fund manager named Mark who shorted Bitcoin in advance and made a significant profit.

He began frequently appearing on television, giving interviews, full of confidence:

"Bitcoin is just a tulip bubble; going to zero is just a matter of time."

He wrote a book titled "The End of Bitcoin."
The publisher urged him to hurry up and take advantage of the momentum.
He devoted himself to writing for six months, and the book was finally published.
On the day of publication, Bitcoin began to rebound.
Three months later, it rose back to $10,000.

He went on television again and said:

"This is a dead cat bounce; it will drop again soon."

Bitcoin rose to $20,000.

He said: "The bubble has grown larger; the crash will be worse."

It rose to $40,000.

He said: "..."
It rose to $60,000.

He took the book down from Amazon.

On the day it was taken down, a reader left a message:

"I bought this book, and following your advice, I didn't buy any coins. Can you compensate me for my losses?"

He did not respond.
But he changed his Twitter avatar, remaining low-key ever since.

There are two types of prediction experts: those who are lucky and those who haven't been proven wrong yet.