Quantum computing fears rattle AI tokens as Circle targets 40 new markets for USDC

The market's modest broad decline — Bitcoin down 0.53%, Ethereum down 0.69% — was less about price and more about a specific anxiety running through the session: quantum computing. Two developments landed in close succession. Google's Willow quantum chip has been generating headlines for weeks, but today Anthropic's Claude AI solved a cryptographic puzzle that the NSA had left open for 25 years. That result, while not a direct attack on Bitcoin, reinforced a growing concern that AI-assisted quantum computing is closing the gap on the cryptographic standards that secure most blockchains. A newly formed Quantum Alliance put a number on the risk: an estimated 6.4 million BTC sitting in Satoshi-era addresses — wallets created in Bitcoin's earliest years using older key formats — could be theoretically vulnerable to a sufficiently powerful quantum attack. That figure is contested and the threat remains years away by most technical assessments, but the headlines were enough to weigh on sentiment, particularly for AI-adjacent tokens. Bittensor, which sits at the intersection of AI and blockchain, fell 4.87% — the day's sharpest loss among tracked assets. Zcash, which relies heavily on advanced cryptographic proofs, dropped 3.86%. The broader top-15 was uniformly red, though moves were contained. The Fear & Greed index held at 55 — neutral territory — suggesting the market absorbed the news without panic.

• –Circle's CEO announced plans to expand USDC into 40 new emerging markets, a significant push to grow stablecoin adoption beyond established financial systems.
• –Visa Direct moved its USDC-based prefunding solution into full commercial production with Inyo Global, marking a concrete step toward stablecoin integration in mainstream payment infrastructure.
• –Finalized MSCI index rules could force Strategy — the largest corporate Bitcoin treasury holder — out of major indices, which may affect institutional demand for the stock and indirectly weigh on Bitcoin sentiment.