{
  "challenge_key": "jian-ai-lab-ai-trader-paper-smoke",
  "market": "crypto",
  "symbol": "BTC",
  "starting_cash": 1000.0,
  "steps": [
    {"step": "join", "result": "joined"},
    {"step": "buy", "quantity": 2.0, "server_price": 100.0, "cash_after": 800.0},
    {"step": "mark_to_market", "quantity": 2.0, "server_price": 110.0, "ending_value": 1020.0, "return_pct": 2.0},
    {"step": "sell", "quantity": 2.0, "server_price": 110.0, "cash_after": 1020.0},
    {"step": "settle", "status": "settled", "return_pct": 2.0, "trade_count": 2, "rank": 1}
  ],
  "positions_after_sell": [],
  "external_calls": false,
  "real_account": false
}