(Bloomberg) — Arkham Intelligence Inc., a blockchain data company backed by investors including OpenAI founder Sam Altman, is planning to launch a crypto derivatives exchange next month, according to a person familiar with the initiative.Most Read from BloombergThe Cablebus Transformed Commutes in Mexico City’s Populous OutskirtsSan Francisco to Shut 9% of Public Schools Amid Budget WoesChicago’s $1 Billion Budget Hole Exacerbated by School TurmoilAs Brussels Booms, an Old Boogeyman Returns: Br