An unidentified entity has bought nearly $1 billion worth of ethereum over the past week as the cryptocurrency surged by 21% to cross the $4,000 milestone. The unidentified entity purchased 221,166 ETH tokens, with data analytics platform Lookonchain tracking $212 million in purchases in just 24 hours. The buyer spread their holdings across six different wallets, acquiring tokens from three major cryptocurrency firms – Galaxy Digital, FalconX and BitGo. Out of the six, the wallet with the most Ether has $181 million worth, while the wallet with the least Ether has $ 128 million worth. This buying spree comes with…