Cardano (ADA) has achieved a commendable second place in a recent assessment of blockchains that are poised to withstand potential quantum computing threats. According to a study from Google Quantum AI, shared by Cardano spokesperson Dori, this ranking reflects the readiness of various blockchains to transition towards “post-quantum cryptography.”
Cardano Takes Second Place Behind Algorand
The evaluation took into account several factors, including whether public keys were exposed and if the blockchain protocol allowed for key rotation or upgrades. Additionally, it considered the duration for which transactions remain vulnerable before they receive confirmation on the blockchain.
In this ranking, Algorand stands out as the only blockchain ahead of Cardano due to its successful testing of quantum-resistant transactions in real-world scenarios and its support for key rotation. This indicates that should quantum threats emerge today, only Algorand possesses the necessary infrastructure to transition its users towards more secure cryptographic measures.
🧵Quantum Security Ranking based on findings from Google Quantum AI (summarized with Claude):
[Tier 1 – Leading Position]
– AlgorandThe sole major chain that has executed a quantum-resistant transaction in production. It supports native key rotation and is advancing post-quantum security… pic.twitter.com/koJM2Khr1Q
— dori (@dori_coin) April 1, 2026
On its part, Cardano is regarded as inherently secure since it conceals public keys longer than many other blockchains do. Utilizing an eUTXO model allows spending keys to remain hashed until funds are utilized. This architectural choice provides an additional layer of protection for users within its ecosystem.
This mechanism ensures that potential attackers cannot access keys until actual transactions take place. Other projects sharing similar attributes with Cardano include Dogecoin, Zcash, and Bitcoin Cash; all classified as “tier 2” by the Google Quantum AI report due to their structural advantages over other networks.
The report also categorizes two additional groups of blockchains labeled “vulnerable but preparing” and those with a “broad attack surface.” Blockchains like XRP Ledger, Litecoin, and Bitcoin fall under the first category.
Their networks typically expose public keys more frequently than desired which may render them susceptible to attacks from quantum computers.
Ethereum and Solana have been identified as having extensive attack surfaces because their public keys are perpetually visible—a vulnerability providing ample opportunity for potential quantum assaults.
Cardano’s Readiness Against Post-Quantum Threats
An important aspect highlighted in this research paper is how it evaluates blockchains based on future possibilities regarding advanced quantum computers capable of compromising existing network cryptography—technologies that have yet to materialize but could be over ten years away according to some analysts’ predictions.
A number of blockchain platforms are already strategizing upgrades through forks prior to any imminent threat emergence; Ethereum Foundation has indicated plans for a migration towards being quantum-safe around 2029.
Certainly noteworthy is Sebastian Guillemot—the Chief Technology Officer at Cardano Midnight—who reassured users back in October 2025 about their platform’s resilience against possible threats posed by quantum computing technologies. This statement reflects proactive measures taken by Cardano well ahead concerning anticipated challenges related future advancements in technology.