Crypto analyst and Taproot developer Udi Wertheimer has stated that the Lightning Network is fundamentally vulnerable in a post-quantum scenario and claimed that its design leaves user funds exposed in ways that cannot be mitigated under current assumptions.
According to Wertheimer, the core issue stems from how public and private keys function in cryptocurrency systems. While traditional cryptography relies on the idea that private keys cannot be derived from public keys, he explained that sufficiently advanced quantum computers, which are known as cryptographically relevant quantum computers (CRQCs), could break this assumption by calculating private keys directly from public ones.
Lightning’s Weak Spot
In most on-chain Bitcoin usage, users can reduce exposure by avoiding address reuse, which helps keep public keys from being exposed unnecessarily. However, Wertheimer argued that this defense does not apply to the Lightning Network, where public keys must be shared as part of its b
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