A brilliant young cryptocurrency pioneer named Nikolai Mushegian tweeted on Oct. 28 that intelligence agencies were going to murder him — and was found dead on a Puerto Rico beach hours later. “CIA and Mossad and pedo elite are running some kind of sex trafficking entrapment blackmail ring out of Puerto Rico and Caribbean islands,” Mushegian, a developer of blockchain-based decentralized finance platforms who wanted to end global banking corruption, tweeted at 4:57 a.m. “They are going to frame me with a laptop planted by my ex [girlfriend] who was a spy. They will torture me to death.” The 29-year-old...