The Treasury (under the executive branch) could possibly regulate crypto as a currency, but most likely this would require new legislation from congress to give the Treasury the power to do so.

https://www.pbs.org/newshour/economy/treasury-secretary-yell...

Chevron deference which like firearms and several other things is how they attack the constitution while keeping their hands clean.

They will probably defer to the EPA, who will make a regulation based on their suggestion. This allows them to bypass congressional oversight at least until someone very rich manages to bring the case in front of the supreme court. Extremely common unfortunately.

You are aware that a government can make laws and change laws right?

And also change the constitution right?

Of course it could imply that it needa to go through certain channels but no one should assume that it literally meant 'the president will now say x and now x is the law'.

> Which constitutional power gives the president this ability?

Congress has delegated broad authority to the President with respect to energy, environment and financial services.