The whale known as 'pension-usdt.eth' has suffered losses exceeding $15.5 million on short positions in Bitcoin and Ethereum, as reported by Lookonchain. The losses come amid a rebound in the crypto market, impacting the whale's current positions of 1,000 BTC and 20,000 ETH. Previously, 'pension-usdt.eth' had a successful trading streak with 20 consecutive profitable trades and a win rate over 85%.