Visa announced a partnership with Aquanow on November 27 to enhance payment settlements using stablecoins, targeting financial institutions across Central and Eastern Europe, the Middle East, and Africa. The collaboration aims to accelerate cross-border transactions and reduce costs through blockchain technology integration. Visa's annualized transaction rate using USDC now exceeds $2.5 billion.

South Korea's Upbit halted deposit and withdrawal services following unauthorized transfers of approximately $37 million in Solana-based tokens on Nov. 27. The exchange relocated remaining assets to cold storage and initiated comprehensive security audits across all blockchain networks. Upbit committed to fully compensating affected users from corporate reserves.

South Korean cryptocurrency exchange Upbit confirmed unauthorized transfers of approximately $37 million from its Solana network wallet on May 15, 2025. The breach affected multiple tokens including SOL, USDC, RENDER, PYTH, RAY, JUP, JTO, ORCA, BONK, MEW, and MOODENG. The incident marks the exchange's largest security compromise since a 2019 breach involving $50 million in Ethereum assets.

Bitcoin reclaimed the $90,000 level, yet analysts caution that structural headwinds persist. Public companies holding BTC face valuation pressure as share prices fall below reserve values, raising liquidation risks. Spot Bitcoin ETFs recorded $3.57 billion in net outflows this month, the steepest decline since early 2025.

Chainlink rose 15.25% over seven days, supported by ETF-related developments and spot market buying activity. Long-term holders continued to reduce positions during the rally, creating divergent momentum signals for the token.

Nasdaq ISE has filed a proposal with the U.S. Securities and Exchange Commission to increase position and exercise limits for BlackRock's iShares Bitcoin Trust (IBIT) options from 250,000 to one million contracts per side. The exchange cited strong institutional demand and argued the expanded cap would align IBIT with major equity ETF benchmarks. ISE stated the change would pose minimal systemic risk to the underlying bitcoin market.

South Korean technology company Naver and digital asset operator Dunamu announced a five-year investment of 10 trillion Korean won ($6.8 billion) to develop financial infrastructure integrating artificial intelligence and blockchain technologies. The investment follows Naver Financial's acquisition of Dunamu, parent company of South Korea's largest cryptocurrency exchange Upbit, through a share-swap arrangement. The partnership aims to establish a comprehensive system spanning payments, settlements, and broader financial services.

S&P Global Ratings downgraded Tether's USDT stability assessment from 'constrained' to 'weak' on Wednesday, citing increased exposure to volatile assets including Bitcoin and transparency concerns. The move has sparked intense debate among China's estimated 20 million underground crypto users who rely heavily on USDT despite the national ban on digital asset trading.