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February 13 Market Summary: Apple's Worst Single-Day Performance in Five Years, Tonight's CPI is the Ultimate Judge

On February 12th, U.S. markets experienced one of their worst sessions of the year, with major indices declining sharply: the Dow fell 1.34%, the S&P 500 dropped 1.57%, and the Nasdaq plunged 2.03%. The sell-off was largely triggered by Cisco's earnings report. Despite posting record revenue and beating EPS estimates, Cisco’s stock plummeted over 12% due to concerns over shrinking margins from rising memory chip costs and tariff impacts. This raised doubts about the sustainability of AI-driven profitability. The panic spread across tech stocks: Apple fell 5%, Disney dropped 5.31%, and other giants like Meta, Amazon, Nvidia, and Microsoft also declined. Defensive stocks like Walmart and McDonald’s gained as investors sought safety. All eyes are now on the January CPI data, delayed due to a government shutdown and set for release on February 13th. Expectations are for a slight cooling in both headline and core inflation. A lower-than-expected CPI could revive rate-cut hopes and provide relief for risk assets, while a higher reading may further delay Fed easing and intensify selling pressure. Gold showed relative resilience, trading around $4,980-$5,000/oz, while silver fell more sharply. Bitcoin drifted toward $65,000 amid extreme fear in the crypto market, with ETF outflows and AI narrative concerns adding to the pressure. Tonight’s CPI data will serve as a critical catalyst for short-term direction across equities, commodities, and cryptocurrencies.

marsbit02/13 01:58

February 13 Market Summary: Apple's Worst Single-Day Performance in Five Years, Tonight's CPI is the Ultimate Judge

marsbit02/13 01:58

Stop Saying ‘We Need Privacy’

Title: Stop Saying ‘We Need Privacy’ The article argues that "privacy" is not a single concept but rather five distinct problems in the context of blockchain and cryptocurrency. When people demand privacy, they are often referring to one of the following: 1. **Intent Privacy:** Hiding transaction details from observers before execution to prevent front-running by MEV bots. Solutions include private transaction delivery (e.g., Flashbots Protect) and encrypted mempools (e.g., Shutter Network). 2. **Value Privacy:** Concealing the amounts transferred. This is achieved through shielded systems (e.g., Zcash, Penumbra) that use cryptographic proofs to verify transactions without revealing values. Privacy can still be compromised by user behavior patterns. 3. **Graph Privacy:** Protecting the relationships and patterns of who transacts with whom. Techniques include pooled unlinkability (e.g., Tornado Cash mixers) and stealth addresses (e.g., ERC-5564) to break direct on-chain links between transactions. 4. **State Privacy:** Keeping DeFi positions, balances, and liquidation thresholds hidden. This requires storing state as private records and using zero-knowledge proofs (ZK-proofs) to validate state changes without revealing underlying data (e.g., Aztec). Composability and edge interactions remain challenges. 5. **Execution Privacy:** Hiding the computation logic itself, crucial for strategies like auctions or liquidations. Methods include using Trusted Execution Environments (TEEs) (e.g., Secret Network) or ZK-proofs for private execution. The article concludes that privacy often fails at the edges, such as at the RPC (Remote Procedure Call) layer, where providers can collect IP addresses and wallet information. The key is to ask which surface is being protected and where information might leak when users interact with the real world, rather than seeking a single winning privacy model.

比推02/13 00:39

Stop Saying ‘We Need Privacy’

比推02/13 00:39

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