A new bot, dubbed QuanBot, was launched this Monday, August 11, 2025, by an initiative called Project Eleven. Its mission is to monitor Bitcoin transactions in real time and alert on those that may be exposed to risks derived from quantum computers. The tool, accessible through the @quantum_tracker account on X, seeks to provide users with clear information about the vulnerability of funds, avoiding speculation and focusing on practical data.
QuanBot works by scanning transactions in the Bitcoin mempool, the "waiting room" where transactions are recorded before being confirmed on the network.
Its main function is to identify sends to addresses vulnerable to quantum attacks, notify senders if their own transactions expose their public keys through reuse or partial spending, and publish real-time updates on significant movements.
The tool requires no manual intervention and is designed to provide automatic alerts, allowing users to make informed decisions before quantum threats materialize.
QuanBot provides significant utility to Bitcoin, considering that at least 6 million BTC are stored in quantum-vulnerable addresses at the time of writing. Project Eleven details in its announcement two methods by which a cryptographically relevant quantum computer could compromise a Bitcoin address.
The first, using a just-in-time attack on the mempool, involves a quantum machine deriving the private key from an exposed public key in less than the ten minutes it takes for a transaction to confirm, a scenario that requires immediate and advanced computing power.
The second, more plausible, is a harvest-now-decrypt-later attack where adversaries collect public keys today especially from addresses that reuse keys or use specific formats to decrypt them later, when they have a sufficiently powerful quantum processor.
This strategy takes advantage of prolonged data exposure in the Bitcoin ledger, a risk that QuanBot seeks to mitigate with its real-time monitoring and alerts.
The Project Eleven initiative is presented as an educational and technical response, providing the community with a tool to protect its assets in a context where advances in quantum computing, to a certain extent unpredictable, could alter the security of cryptographic systems.
Project Eleven is a project that seeks to secure digital infrastructure by designing products and protocols capable of surviving Q-Day, the historic moment when cryptographically meaningful quantum computing makes its way into technological society with its first real-world, evident application.
According to its blog, Project Eleven raised $6 million in a seed round of funding to build post-quantum cryptography. Just hours after its launch, QuanBot revealed that a Bitcoin whale's 1,820 BTC transaction is vulnerable to quantum computing.
The reason? This whale reportedly moved his funds to a reused Pay to Script Hash (P2SH) address. P2SH addresses don't hide public keys at the time of spending, making them easily discoverable on the Bitcoin ledger network for future collection and decryption.
