Visa takes action to close meme coin credit card reward vulnerability

According to the Chainalysis report, the amount of malicious code written into public chains has increased more than fivefold within a year, with national level attackers accounting for 51% in the second quarter of 2026. Since the release of the open-source weighted Chinese AI model in mid-2025, the number of on chain writes carrying malicious instructions has increased from an average of 2.06 per day to 11.1 per day, covering five blockchains and identifying more than 15 attack groups. This technology is known as "blockchain dead drop", where North Korean UNC5342 deploys malicious instructions on TRON, Aptos, and BNB Chain, and Iranian intelligence affiliates write the instructions into Bitcoin transactions. (Source: Unchained)

According to Glassnode and Bybit reports, Bitcoin has risen by 28% in the past two years, while the median mid cap altcoin has fallen by 74%, and Ethereum has remained relatively stable. The open interest contracts of Bitcoin futures account for about 2% of the market value, while speculative small cap currencies such as PEPE account for nearly 24%. Bitcoin has returned above $80000, driving the total cryptocurrency market value to rise by 4.6% in a single day to approximately $2.85 trillion, while Solana has risen by approximately 10% in a single day. Institutional funds are concentrated in the top tier, with a cumulative net inflow of approximately $55.2 billion from spot Bitcoin ETFs, $13.1 billion from Ethereum funds, and approximately $29.7 million from Solana spot ETFs. (Source: Decrypt)

The size of US treasury bond held by China has dropped from US $1.3 trillion at the beginning of 2010 to US $618 billion at present, the lowest level in 18 years. The number of foreign governments buying US treasury bond has decreased, the number of hedge funds and other investors buying US treasury bond has increased, and the weakening of foreign demand has boosted the yield of US treasury bonds. (Source: Watcher. Guru)

Solana lowered the target slot time from 300 milliseconds to 250 milliseconds on September 18th, completing the third round of acceleration and increasing block output speed by nearly 17%, while the overall network throughput remained unchanged. This adjustment belongs to the third phase of the SIMD-0525 proposal, with the fixed epoch duration of 432000 slots reduced from about 36 hours to about 30 hours, and the staking rewards and validator scheduling accelerated synchronously. (Source: Decrypt)

Visa is taking action to close credit card reward vulnerabilities related to meme coin transactions.