Keep in mind that the dispute before the Court has absolutely nothing to do with blockchain, and it will be fairly rare for the Supreme Court to actually need to understand Bitcoin given its role in the US judicial system.
The Supreme Court mainly deals with procedure, with understandings of things like blochchain settled in places like lower courts and other branches of government.
So to be specific, the question the Court will be asked is, "Does a non-frivolous appeal of the denial of a motion to compel arbitration oust a district court’s jurisdiction to proceed with litigation pending appeal"?