Cryptocurrency markets started the week with a decline. Bitcoin (BTC) dropped by 2% after briefly surpassing the $100,000 mark, causing a decrease in major altcoins. XRP, DOGE, and SOL fell by 5.5%, BNB and ETH by 2.5%. ADA lost 7% after a temporary hack of the Cardano Foundation account. Liquidations totaled over $300 million. The CoinDesk 20 index decreased by 3.6%.