Coinbase Bitcoin Premium Index has been in a negative premium for 7 consecutive days, currently standing at -0.044%.

On December 21, the Ethereum Community Foundation posted on Platform X in response to the "50 Million USDT Phishing Attack" incident, calling for an end to truncating cryptocurrency addresses with ellipses (e.g., 0xbaf4b1aF...B6495F8b5). Addresses must be fully displayed—hiding the middle portion creates unnecessary risks. Some wallets and blockchain explorers currently offer UI options with security flaws, but these issues can be fixed. As previously reported, the phisher generated an address matching the victim’s in the first and last three digits, then sent 0.005 USDT to the victim’s address. When the whale either transferred funds officially or copied the address from the latest transaction record, the full 50 million USDT went to the phisher’s spoofed address. The phisher quickly swapped the 50 million USDT for DAI (to avoid freezing) before converting all of it into 16,624 ETH. These ETH were later laundered via Tornado.

**December 21 – Per CoinMarketCap data, the Altcoin Season Index currently sits at 17.** The index briefly reached 78 on September 20, while last week’s weekly average stood at 21. This metric indicates that over the past 90 days, approximately 17 of the top 100 cryptocurrencies by market cap have outperformed Bitcoin in price gains. *Note: The CoinMarketCap Cryptocurrency Altseason Index is a real-time indicator used to determine if the crypto market is in an altcoin-dominated season. It is based on the performance of the top 100 altcoins relative to Bitcoin over the past 90 days.*

On December 21, Decenter reported—citing unnamed sources—that the Bank of Korea (BOK) has recently sent a formal document to major local banks outlining plans for a second round of central bank digital currency (CBDC) testing. A BOK official noted, “Details including specific methodologies and timelines are currently under discussion.” The upcoming round is considering distributing a portion of government subsidies via CBDC, with the goal of restricting how the funds are used and cutting administrative and management costs tied to subsidy disbursement. Back in April, the BOK launched a three-month CBDC pilot involving seven participating banks, but later paused the project. At the time, the pilot faced criticism for its limited practical value and for imposing billions of Korean won in costs on the participating institutions.

On December 21st, monitoring data from Hyperinsight (link: https://t.me/HyperInsight) indicates that "Buddy" Huang Licheng’s address has opened a 10x-leveraged long position in ZEC. The position size is approximately $390,000, with an entry price of $439.24.

HTX market data shows Bitcoin is currently trading at $88,661 as of December 21st. Strategy’s Bitcoin position has an unrealized profit of 18.3%, totaling approximately $91.9 billion. As of December 14, 2025, Strategy holds 671,268 Bitcoins with a total cost of around $50.33 billion—an average cost of roughly $74,972 per Bitcoin.

On December 21, Federal Reserve official Harker stated that November inflation data was positive, but noted potential data collection distortions from the October-to-mid-November government shutdown may have underestimated 12-month price growth. The Labor Department reported a 2.7% year-over-year increase in November CPI, but estimates adjusted for those data challenges put the figure closer to the 2.9% to 3.0% range widely expected by forecasters. Harker also expressed concern about cutting interest rates, citing her view that the neutral interest rate is higher than commonly believed—and the U.S. economy has the momentum to sustain robust growth next year. The neutral rate, which cannot be directly observed, is inferred from the economy’s current state. (Source: FX168)