Railgun - No Rug, No Cry

No Rug, No Cry

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Railgun

A collection of 2 posts

Trust Me, I’m Reliable: Railgun Broadcasters and the Self-Scored Scoreboard

Trust Me, I’m Reliable: Railgun Broadcasters and the Self-Scored Scoreboard

Railgun promises private transfers on public chains (Currently Ethereum, Arbitrum, BSC, and Polygon) using Zero-Knowledge proofs—neat math, fewer prying eyes. In this post I zoom in on a smaller but telling piece of the stack: public broadcasters. They relay your encrypted TX so your public 0x address doesn’t

Rekt by One Block: Post-Mortem of a Railgun Broadcaster

Rekt by One Block: Post-Mortem of a Railgun Broadcaster

TL;DR: A Railgun broadcaster was tricked into relaying transactions that always revert on-chain but pass simulation. The trick hinges on a deadline check (require(deadline >= block.number)) combined with the difference between the block used for simulation and the next block when the transaction is actually mined. We