Bitcoin and ether, the two largest cryptocurrencies by market capitalization, recently rose 3.3% and 6.7%, respectively, over the past 24 hours. On Tuesday, BTC crossed $20,000 for the first time since Oct. 5, while ETH topped $1,500 for the first time since the Sept. 15 Merge, the Ethereum blockchain’s technological overhaul. Whether a new longer-range upturn is afoot or BTC and ETH prices are likely to revert to the mean is still unclear.