An interesting trend — one seen on various occasions with gold — is at play this month in the cryptocurrency space: Shares of bitcoin miners are outperforming the largest digital currency to the upside. Just look at the CoinShares Valkyrie Bitcoin Miners ETF (WGMI). That actively managed ETF settled at $31.64 on September 2, the first trading day of the month. As of midday Friday, September 19, WGMI was trading north of$42. That confirms it notched an impressive rally in short order. WGMI holdings such as ...