Bitcoin's hash price, a key metric for miner profitability, has fallen nearly 52% to $0.0459 per terahash second, nearing its lowest ever level. The drop comes as Bitcoin's price, miner rewards, and mining difficulty have all plummeted. Despite this, most Bitcoin mining machines remain profitable, according to Mitchell Askew, head analyst at Blockware Solutions. However, Bitcoin miner reserves have hit a 14-year low, indicating a significant sell-off from miners. The market sentiment has also been affected by news of Mt. Gox's plans to sell $8.6 billion worth of Bitcoin.