Bitcoin, Ethereum Begin Slow Rebound as Terra, Near, Dogecoin, Polygon Surge. Crypto markets have shaken off last week’s terrible slump. BTC and ETH are up, but altcoins are up more. Many crypto market watchers think the bottom is in for Bitcoin and Ethereum after their terrible start to the new year. Bitcoin is up 6% from this time one week ago, and Ethereum is up 10% since then.