This evening, Tesla and SpaceX CEO Elon Musk tweeted that he's working with the developers of Dogecoin to make the cryptocurrency more efficient.

"Working with Doge devs to improve system transaction efficiency," he said. "Potentially promising."

Musk has made cryptocurrency a core part of his identity over the past year.

On Twitter, and during an appearance on "Saturday Night Live" the past weekend, he's brought forth an onslaught of memes about Dogecoin, a tongue-in-cheek cryptocurrency that's spiked in value since becoming the subject of Musk's attention.

He also embraced the seminal cryptocurrency Bitcoin at his electric carmaker Tesla, which bought $1.5 billion worth of the digital cash in February of this year and started accepting it for car purchases in March.

Things got more complicated in April, though, when Tesla unloaded $100 million of that Bitcoin. Musk characterized the sale as a move to "prove liquidity" for the cryptocurrency.

Then yesterday, in a surprise reversal, Musk said that Tesla would no longer be accepting Bitcoin as payment for its vehicles. Musk said that the flip flop was due to Bitcoin's considerable environmental toll, but the move prompted furious outrage from cryptocurrency enthusiasts, who argued that it's vanishingly unlikely that the mercurial billionaire didn't understand the carbon footprint of Bitcoin mining when he started to dabble in it at Tesla earlier this year.

Before making the Dogecoin announcement today, Musk had already been musing about topics related to the environment and cryptocurrency.

"It is high time there was a carbon tax!" he exclaimed. Later on, he tweeted that "I strongly believe in crypto, but it can’t drive a massive increase in fossil fuel use, especially coal."

It's not clear how serious Musk was about helping the Dogecoin team, or what form that help might take. And to be fair, Musk could be joking about the collaboration.

Dogecoin itself, the price of which has surged more than 10,000 percent this year largely because of Musk's boosterism, is in the middle of a controversy of its own.

This week, an app developer and startup accelerator announced their intentions to assemble a team that would build apps that work "off the Doge blockchain."

But a Twitter account associated with actual Dogecoin developers immediately distanced itself from the project.

"We are aware a new company has started offering devops services on Dogecoin," the account tweeted. "Please note this does not involve any of the team maintaining Dogecoin Core."

A current Dogecoin developer didn't answer questions about a potential collaboration with Musk by press time.

But Doge creator Billy Markus, who is no longer involved in the project, did share his own thoughts in the form of a meme.

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