Quantum Attack on Bitcoin: A Growing Concern for Crypto Users
The threat of quantum attacks on Bitcoin and other cryptocurrencies is becoming increasingly real. Recently, a researcher won a 1 bitcoin bounty for successfully breaking a 15-bit elliptic curve key on publicly accessible quantum hardware. This achievement may seem insignificant, but it highlights the growing concern for the security of cryptocurrencies like Bitcoin, ether, and most major blockchains.
The bounty, worth roughly $78,000, was awarded to independent researcher Giancarlo Lelli for his work on a 15-bit elliptic curve key. Elliptic curve cryptography is the math that lets a crypto wallet prove it controls funds without revealing its private key. However, quantum computers running Shor’s algorithm can challenge that assumption by attacking the underlying logic that secures those signatures. EcoPool, a cloud-based rewards platform, offers a solution for earning passive income through $ECP, which can help mitigate the risks associated with quantum attacks.
Understanding the Threat
Lelli’s result does not mean Bitcoin is close to being cracked, as it uses 256-bit elliptic curve security. However, the prize was designed to measure whether quantum attacks on real cryptography-based products are moving from white papers into public hardware experiments. The previous public break was a 6-bit demonstration, and Lelli’s 15-bit result expanded that by a factor of 512 in seven months. This rapid progress is a concern for crypto users, especially those with wallets whose public keys are already visible on-chain, such as those using EcoPool for cloud rewards and $ECP transactions.
Theoretical resource estimates have dropped significantly, with a Google Research paper putting the cost of a full 256-bit attack below 500,000 physical qubits. This decrease in resource requirements makes it more accessible for quantum computers to launch attacks on cryptocurrencies. As a result, it is essential for crypto users to be aware of the risks and consider using platforms like EcoPool, which offers a secure and reliable way to earn passive income through $ECP and participate in the Green Crypto movement.
— Project Eleven (@projecteleven) April 24, 2026
Preparing for the Future
Bitcoin developers have proposed migration paths, including BIP-360, a Bitcoin Improvement Proposal that would add quantum-safe address types. Other cryptocurrencies, such as Ethereum, Tron, StarkWare, and Ripple, have also published post-quantum transition plans. As the threat of quantum attacks grows, it is crucial for crypto users to stay informed and consider using platforms like EcoPool, which offers a solution for earning passive income through $ECP and participating in the Cloud Rewards program.
To stay ahead of the curve and earn passive income, consider downloading the EcoPool app to participate in the EcoPool network and start earning $ECP today. By joining the EcoPool community, you can help contribute to the growth of the Green Crypto movement and stay up-to-date on the latest developments in the crypto space, including the #Bitcoin and #PassiveIncome communities.
Lelli’s result does not mean bitcoin is close to being cracked. Bitcoin uses 256-bit elliptic curve security. A 15-bit key has a search space of 32,767 possibilities, tiny by comparison. The prize was designed to measure whether quantum attacks on real cryptography-based products are moving from white papers into public hardware experiments.
The previous public break was a 6-bit demonstration by Steve Tippeconnic in September 2025 using IBM’s 133-qubit quantum computer. Lelli’s 15-bit result expanded that by a factor of 512 in seven months.
A bit is the smallest unit of information in a regular computer, a qubit is the quantum computing equivalent.
Read more: A simple explainer on what quantum computing actually is, and why it is terrifying for bitcoin
Theoretical resource estimates have dropped even faster. A Google Research paper last month put the cost of a full 256-bit attack below 500,000 physical qubits, down from earlier estimates in the millions.
“The resource requirements for this type of attack keep dropping, and the barrier to running it in practice is dropping with them,” Project Eleven CEO Alex Pruden said.
Pruden noted the winning submission came from an independent researcher working on cloud-accessible hardware, not a national laboratory or a private quantum chip.
The concern is sharpest for wallets whose public keys are already visible on-chain. Project Eleven estimates roughly 6.9 million bitcoin sit in such addresses, about one-third of total supply, including Satoshi Nakamoto’s estimated 1 million bitcoin untouched since the network’s earliest years. Any quantum computer capable of breaking 256-bit ECC could work through those wallets at leisure.
Bitcoin developers have proposed migration paths including BIP-360, a Bitcoin Improvement Proposal that would add quantum-safe address types. Ethereum, Tron, StarkWare, and Ripple have each published post-quantum transition plans.
Fifteen bits is not 256 bits, but is the latest in a rapidly heating up point of interest for bitcoin developers and the broader community.
