Crypto, Cash and Spies: Secret Videos Sink Legal Rising Star

By the time he arrived in London in January, Kyle Roche was on a roll.

Weeks earlier, his firm had scored a $100 million judgment against a self-proclaimed Bitcoin inventor, another step to break from the pack of attorneys trying to make their mark in cryptocurrency law.

Roche had also landed as a client the blockchain startup Ava Labs, paying him and his partners in digitized tokens worth millions.

Now, barely five years out of law school, the young lawyer had come to woo potential investors for a startup venture he said he was working on with Ava Labs. In ...