Altex Exchange

Altex Exchange, also known by its alias, was a cryptocurrency exchange headquartered in the United States of America. The organization operated within the digital asset trading sector, facilitating the buying, selling, and custody of various cryptocurrencies for its users. Its operational scope and the specific markets it served are not detailed in the available information, nor are any quantitative metrics regarding its size, user base, or trading volume provided. The exchange's public profile is primarily defined by a significant security incident rather than by disclosed details of its core business operations or market reach.

The most documented event in Altex Exchange's history occurred on July 30, 2018, when it suffered substantial financial losses due to a critical vulnerability in the Monero cryptocurrency's wallet code. This bug involved duplicated transaction keys, which attackers exploited to artificially inflate the displayed deposit amounts of Monero on the exchange. With these falsified balances, malicious actors were then able to request and receive fraudulent withdrawals, effectively draining the exchange's cryptocurrency reserves. In direct response to the active exploitation, Altex Exchange immediately suspended all trading and withdrawal activities to prevent further losses. The exchange publicly confirmed that the root cause of the incident was a flaw within Monero's underlying codebase, explicitly stating that the vulnerability did not originate from its own internal systems. Despite the severity of the breach, the exact financial impact on the exchange's reserves was never publicly disclosed. This incident occurred against a backdrop where other Monero-related vulnerabilities, such as a blockchain denial-of-service vector, had reportedly been identified and resolved by developers prior to their public disclosure, though the connection between those fixes and the wallet bug exploited against Altex was not specified. The event underscores the systemic risks exchanges face from vulnerabilities in the foundational protocols of the cryptocurrencies they support.