If BTC continues to rise to $76,400, the 78 million short position of the largest on-chain BTC short will be liquidated.

April 21 — On-chain sleuth ZachXBT posted to his personal channel that the KelpDAO attacker has begun laundering stolen funds: moving assets from Ethereum mainnet to Bitcoin via Thorchain, plus an additional $78,000 laundered via Umbra.

On April 21st, the U.S. Commodity Futures Trading Commission (CFTC) announced that Unit Labs — parent company of Unitxyz and Tradexyz — filed a request to meet with the regulator on April 7th.

April 21st The HTX Genesis Hackathon—organized by HTX DAO and B.AI, co-hosted by TinTinLand and OpenCity—kicked off in Hong Kong. At the event, HTX DAO Ambassador Molly delivered a keynote on the **"HTX DAO Ecosystem Development Plan: Launch of the Multi-Million Ecosystem Fund and Value Loop Strategy."** She noted the hackathon’s core vision is to build a free financial port rooted in the exchange’s ecosystem. To that end, a five-tier ecosystem matrix spanning the entire industry chain has been established, including: - Huobi HTX as the core business engine and liquidity hub; - HTX DAO as the ecosystem’s governance hub and centralized decision-making brain; - Public chain/innovation layer leveraging TRON for payment network support; - Robust DeFi infrastructure built with projects like JustLend and SunX; - HTX Ventures focusing on industry frontiers, offering investment, incubation, and acceleration for top projects; - B.AI targeting future trends, dedicated to buildi

April 21 — At the "Decoding Web 4.0: When AI Agents Take Over On-Chain Governance" event, Cobo showcased its AI agent-focused "Contractual Execution" mechanism in a live demo session, highlighting how the tool works in real-world transaction scenarios. Built on four core components — intent, execution path, constraint rules, and completion conditions — the mechanism structurally defines each transaction, letting AI agents act autonomously within pre-set parameters. For basic use cases like token swaps, users only need to approve the contract one time. Once greenlit, AI agents execute transactions automatically within set constraints. When a transaction completes, the contract terminates and switches to a pending trigger state to avoid long-term permission risk exposure. For complex use cases like cross-chain bridges, AI agents can plan paths autonomously (including choosing bridges, executing routes, and more) and package the full execution plan into a set of contracts for use

On April 21, Ripple unveiled its XRPL Quantum-Secure Roadmap—an initiative to fortify the XRP Ledger (XRPL) against future quantum threats, with full readiness targeted by 2028. The roadmap outlines four key stages: 1. **Post-Quantum Recovery (Q-Day Preparedness)**: Focuses on establishing contingency plans to safeguard funds if classical cryptographic standards are decrypted. 2. **H1 2026**: Proactive planning and testing to assess quantum risks, plus collaboration with Project Eleven to validate NIST-recommended algorithms. 3. **H2 2026**: Integration of post-quantum signature schemes into Devnet, alongside exploration of privacy primitives. 4. **2028 Target**: Propose ecosystem amendments to enable a full transition to native post-quantum cryptography. Ripple noted that XRPL’s built-in key rotation and seed-derived key generation capabilities already lay the groundwork for this migration—positioning it with a protocol edge over networks like Ethereum when addressing qu