LZ Research paper argues slashing may not protect proof-of-stake networks

Proof-of-stake blockchains lean on a simple threat: misbehave and you lose your money. A new paper from LZ Research argues that threat may arrive too late to matter. The paper is titled “Too Late to Slash: Coordinating a Risk-Free Equivocation Attack.” Researchers Hao Chung and Chen-Da Liu-Zhang uploaded it to arXiv on September 24, 2026, under identifier 2609.30509. Their core claim is that rational validators can coordinate an attack in a way that sidesteps the penalty slashing is supposed to impose. What the paper actually claims In a proof-of-stake system, validators lock up tokens as collateral for the right to help confirm transactions. Slashing is the punishment mechanism: if a validator is caught cheating, the protocol automatically destroys some or all of its staked funds. The specific form of cheating the paper examines is equivocation — when a validator signs two conflicting blocks, effectively vouching for two incompatible versions of history at once. Chung and Liu-Zhang introduce a coordination protocol for validators. According to the paper, this protocol makes it possible to solicit equivocation from validators without those validators risking losses if the attack fa...