Oct 10, 2025, 5:52 a.m.
- Monero has released the ‘Fluorine Fermi’ update to enhance user privacy against spy nodes.
- The update improves peer selection to reduce connections to potentially malicious nodes, increasing transaction security.
Leading privacy blockchain Monero has released an important upgrade that significantly strengthens user protection against spy nodes.
The blockchain announced CLI v0.18.4.3 ‘Fluorine Fermi’ on X, calling it a highly recommended release that enhances protection against spy nodes.
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Monero relies on a decentralized peer-to-peer (P2P) network where nodes (computers) connect directly to each other to share and verify transactions and blocks.
Privacy is ensured through several key technologies: each transaction uses unique stealth addresses so that the recipient’s actual address stays hidden; ring signatures mix a sender’s transaction with other decoy transactions, making it unclear who really sent the funds; and Ring Confidential Transactions (RingCT) hide the amount being transferred.
(RingCT hides amounts by replacing them with a technical process called cryptographic commitments. Instead of showing the exact value, each transaction includes proofs that inputs equal outputs without revealing numbers. The network checks these proofs, confirming no coins are created or lost, while the actual transferred amounts remain invisible to outside observers.)
Still, a paper published on the research sharing platform arXiv in September noted the growing presence of non-standard nodes in the network. These nodes pose as honest nodes but are likely intended for monitoring the network and spying on other nodes, thereby endangering privacy.
The Fluorine Fermi update tackles this challenge by implementing an improved peer selection algorithm that reduces the chance users connect to multiple nodes within the same IP subnet, a common spy node tactic. It discourages connections to large clusters of suspicious IP addresses, steering users toward safer nodes.
Sounds too technical? Here’s a loose analogy that might make the update easier to understand. Imagine Monero as a secret mail service that lets people send letters anonymously. In this system, nodes act like mail carriers who hold, deliver, and verify these letters as they move through the network.
However, some mail carriers might turn sneaky and try to track who is sending which letters. The Fluorine Fermi upgrade helps the Monero mail service avoid these sneaky carriers by changing how letters are routed and to whom they are sent, making it much harder for spies to follow the trail.
Monero’s XMR token rose to a three-week high of $347 during the overnight and has since pulled back to $340, CoinDesk data show.
AI Disclaimer: Parts of this article were generated with the assistance from AI tools and reviewed by our editorial team to ensure accuracy and adherence to our standards. For more information, see CoinDesk’s full AI Policy.
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