Yesterday, the US Bitcoin spot ETF saw a net inflow of $238.4 million, while the Ethereum spot ETF saw a net inflow of $67.8 million.
Per Farside data on April 21, U.S. Bitcoin spot ETFs recorded a net inflow of $238.4 million yesterday. BlackRock’s IBIT led with a net inflow of $256 million, while Grayscale’s GBTC posted a net outflow of $24.9 million.
Separately, U.S. Ethereum spot ETFs saw a net inflow of $67.8 million yesterday. BlackRock’s ETHA brought in $76.1 million in net inflows, and BlackRock’s ETHB added $13.2 million in net inflows.
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Meme Coin ASTEROID Market Cap Surpasses $210 million to Hit New All-Time High, with a 24-hour Growth of 47.2%
April 21 – Per GMGN monitoring, the Ethereum-based meme coin ASTEROID has surged nearly 40% in the past hour, topping out at over $2.1 billion in market cap to set a new all-time high. At press time, its market cap stands at $1.8 billion, with 24-hour trading volume hitting $55.7 million and a 24-hour price jump of 47.2%.
The ASTEROID meme coin’s narrative traces back to Liv Perrotto, a 15-year-old girl whose final wish before passing was to meet Elon Musk. She helped design a Shiba Inu-shaped plush toy named “Asteroid.” Following her death, her mother publicly reached out to Musk, and the story gained wider traction after being featured on renowned media personality Glenn Beck’s show. On April 19, Musk greenlit Asteroid as SpaceX’s official mascot.
BlockBeats cautions users: Meme coins are extremely volatile, driven primarily by market sentiment and hype, with no inherent value or practical use case. Investors are advised to exercise caution and be fully aware of the associated
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Arbitrum Security Council Freezes KelpDAO Hacker's 30,766 ETH
On April 21, the Arbitrum Security Council announced it had taken emergency action to recover 30,766 ETH from an Arbitrum One address tied to the KelpDAO exploit.
With law enforcement support, the Council identified the attacker’s identity—prioritizing the security and integrity of the Arbitrum community while ensuring no impact to users or applications.
After extensive technical investigation and review, the Council deployed a solution to move the funds to a secure intermediate frozen wallet without altering any other chain state or affecting users. As of 11:26 PM Eastern Time on April 20, the transfer was completed successfully.
The original funds-holding address can no longer access the assets; only Arbitrum custodians may take further action to transfer the funds, a process to be coordinated with all relevant parties.
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Ripple Unveils Quantum Resistance Roadmap, Aiming to Make XRP Ledger Quantum-Secure by 2028
April 21 — Ripple has officially unveiled its quantum resistance roadmap for the XRP Ledger (XRPL), targeting full quantum security for the network by 2028. The plan is primarily designed to counter the “Harvest Now, Decrypt Later” attack vector—where an adversary collects encrypted data today and decrypts it later using quantum computers. The roadmap unfolds in four phases:
### Phase 1: Q-Day Contingency Planning (In Progress)
Establish a Quantum Day (Q-Day) contingency response framework. If existing classical encryption is suddenly compromised, the network will immediately stop accepting traditional public-key signatures, forcing a shift to quantum-secure accounts. Concurrently, explore asset ownership verification via post-quantum zero-knowledge (ZK) proofs—enabling existing holders to recover funds securely in emergencies without exposing vulnerable keys.
### Phase 2: Risk Assessment & Algorithm Testing (H1 2026)
Conduct a full assessment of post-quantum cryptography’s imp
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Analysis: Quantum computers do not pose a threat to a 128-bit symmetric key. The "post-quantum cryptography" has been subject to panic-misinterpretation.
**April 21: Quantum Computers Won’t Crack 128-Bit Symmetric Encryption Anytime Soon, Expert Argues**
Cryptography engineer Filippo Valsorda said this week that real-world quantum computers won’t break 128-bit symmetric encryption (like AES-128) anytime soon—even with the fastest possible development pace. The current "post-quantum cryptography" panic, he noted, stems from a common misunderstanding.
In his article *Quantum Computers Do Not Threaten 128-Bit Symmetric Keys*, Valsorda debunked the myth that the Grover algorithm would "halve" a symmetric key’s security (reducing 128 bits to 64 bits of protection). This claim ignores Grover’s critical practical flaw: it can’t be parallelized efficiently. Its steps must run serially, and forcing parallelization would skyrocket total computing costs. Even an ideal quantum computer would need ~2^104.5 operations to crack AES-128—tens of billions of times more expensive than breaking today’s asymmetric encryption (e.g., RSA, ECDSA)—making
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