For several years, the value of the cryptocurrency bitcoin has risen sharply.
In five years, a bitcoin has increased in value by close to 10,000 percent.
But lately, the course has bounced a lot up and down and an important player behind the roller coaster is Elon Musk.
The American entrepreneur and Tesla CEO has long been cherished by bitcoin advocates.
When he told earlier this year that Tesla bought bitcoin for $ 1.5 billion at the same time as he announced that customers can buy electric cars from the company using the currency, it further accelerated the bitcoin price.
The same Musk has now affected the bitcoin exchange rate in the other direction.
Bad for the climate
Last week, Elon Musk announced that Tesla will stop bitcoin as a means of payment.
This is justified by concerns about the rapidly increasing use of fossil fuels that occurs when bitcoin is produced.
Creating new bitcoins requires large amounts of energy-intensive computing power, which is negative for the climate.
This criticism of the cryptocurrency caused the price to fall and now another twitter comment has affected the price.
Unclear answer on twitter
This time it is a twitter user "Cryptowhale" who writes that bitcoin owners will take a hit next quarter when they find out that Tesla has dumped its bitcoin holdings.
"Given the hatred that Elon Musk has to endure, I would not blame him."
To this tweet, Elon Musk replies "Indeed" (really), but it is unclear whether he agreed that Tesla would sell its holding in the volatile cryptocurrency, or whether he just agreed that he has received hate.
This post also caused the bitcoin price to fall.
A few hours later, Elon Musk tweeted that Tesla had not made any new bitcoin deals.
"To clarify speculation: Tesla has not sold any bitcoin"
This tweet caused the price to rise again.
When bitcoin was valued at its highest, a single bitcoin cost about $ 64,000.
On Monday morning, bitcoin is traded for about 45,000 dollars.