One miner just earned over $215,000 Most ordinary people haven't been able to mine Bitcoin at a profit for years. As the difficulty of mining the cryptocurrency has increased, most rewards have gone to massive operations that rely on a bunch of incredibly powerful machines. But solo miners with relatively weak setups have found success in recent weeks using USB-based mining rigs. The most recent example comes from a solo USB miner participating in "solo.ckpool.org," which purportedly offers "no frills, no fuss 2% fee anonymous solo bitcoin mining for everyone." The miner solved a block with a rig that had...