Jane Street quant just stole and fit a $40-million trading brain inside a box that costs $4,000 and quietly walked out of the building with it. It's the new AMD Ryzen AI Halo. Eleven weeks later, that computer has made him $400,000 - from his bedroom. His wallet: The model doesn't guess where Bitcoin goes. It simulates it. Every five minutes it reads the candle into a pattern net - break of structure, order blocks, the gaps where liquidity hides. Then it hands that read to MiroFish: a simulation that runs the next five minutes forward thousands of times, sorts every path into three outcomes - bear, neutral, breakout and threads the median straight through them. That median is where price actually lands. Not where the crowd hopes. When that fair value drifts 15¢ off the live book, the edge is real. It sizes by Kelly and fires. One button, no nerves. On the firm's cluster, one simulation like that ate serious hardware. The Halo box - 128GB of unified memory, a 200B model held whole, runs thousands a minute, offline, while he sleeps. No cloud. No login the firm can kill. The desk still owns the model. It just can't aim it where he aims it - Polymarket's too small for a fund that size to touch. He took the edge home. Two clicks and you trade right beside it: