Crypto analyst and Taproot developer Udi Wertheimer has warned that the Lightning Network could face serious risks in a future shaped by quantum computing. He argues that the system’s design may leave user funds exposed in ways that cannot be fully addressed under current conditions.
Wertheimer explained that the concern lies in how cryptographic keys work. Modern systems assume that private keys cannot be derived from public ones. However, advanced machines known as cryptographically relevant quantum computers could eventually break this assumption by calculating private keys directly from public data.
He pointed out that in regular Bitcoin transactions, users can limit risk by avoiding address reuse, which reduces unnecessary exposure of public keys. This protection does not apply to the Lightning Network, where sharing public keys is essential for its operation.
The network functions through payment channels, which are multi signature arrangements between participants. To establish and maintain these channels, users must exchange public keys with counterparties. These keys can also be stored by third parties, sometimes without users fully understanding who operates the underlying infrastructure.
Wertheimer warned that if any entity holding this data gains access to a powerful quantum system, or if the information is leaked to one, private keys could be derived without user involvement. This could allow attackers to steal funds without needing to intercept transactions in real time. Instead, they could analyze existing public key data offline.
He also highlighted the lack of transparency in Lightning infrastructure, noting that some service providers operate anonymously. This makes it difficult for users to evaluate how securely their information is being handled.
According to Wertheimer, even best practices within the Bitcoin ecosystem cannot eliminate this issue because the sharing of public keys is unavoidable in Lightning. He described the network as fundamentally flawed in a quantum context, adding that fixes at the Lightning level alone would not be enough.
Addressing the threat would require changes to Bitcoin’s core protocol to introduce quantum resistant cryptography. Such upgrades have not yet been implemented, leaving Lightning balances potentially at risk as quantum technology advances.
His comments follow a recent warning from Google, which published research outlining the dangers quantum computing could pose to cryptocurrencies. The report suggested that a sufficiently advanced system could break the private keys of the largest Ethereum wallets in under nine days, putting more than 20 million ETH at risk.
Meanwhile, Blockstream has begun exploring protections by integrating quantum resistant cryptography into its Liquid sidechain. This approach allows users to create contracts that require quantum safe signatures before funds can be spent, adding an extra layer of security without altering Bitcoin’s base protocol.
Researchers have identified several potential risks in such systems, including forged transaction signatures, fake block validations, weaknesses in confidential transactions, and vulnerabilities in cross chain asset transfers.#crypto#cryptonews https://coinsignals.net https://t.me/coinsignalpublic
