Bitcoin and altcoins have weakened after last week’s rally, with BTC near $82,000 and Ethereum around $2,650. Large investors accumulated more than 320,000 ETH over the past week, according to cryptocurrency analyst Ali Martinez. During the same period, Ethereum transactions worth more than $1 million rose from 1,202 to 7,113, an increase of approximately 500%. Analysts say the heightened volatility is bringing ETH toward a crucial level that could determine its next major move.