Reserve's a Movie: Ex-Ripple CTO Hands XRP Ledger a Front-Running Force Field 🎬

David Schwartz, Ripple's CTO Emeritus and one of the original developers of the XRP Ledger, has floated a new mechanism he says would neutralize front-running and sandwich attacks on the network's decentralized exchange and automated market maker venues. Schwartz disclosed the proposal publicly this week after community members flagged that validators and well-connected nodes can inspect transactions in the pre-validation queue, analyze pending trades, and spam competing transactions to capture profitable positions before they settle.

The proposal centers on a new ledger object Schwartz called ReservedTxns. Under the scheme, a user could submit a transaction that reserves a slot on the next ledger version, locking in execution priority for the original sender rather than for any party that observed the trade first. Schwartz framed the approach as a targeted fix for a narrow attack surface rather than a sweeping redesign of XRPL consensus.

"I'm not that concerned about this issue. But I have a proposal for a fairly simple scheme that would eliminate this attack," Schwartz said, adding that XRPL already executes transactions in mixed orders to discourage front-running, though critics have argued the protection is insufficient for users running DEX or AMM trades that suffer slippage from sandwich attacks. The ReservedTxns design has not been introduced on XRPL mainnet, and no activation timeline has been announced by Ripple or the XRPL developer community.

$XRP continued trading in a sideways range amid the proposal, with derivatives markets showing elevated futures open interest as traders positioned around the broader XRP Ledger upgrade cycle. No specific price figure was disclosed in connection with Schwartz's announcement, and Ripple has not confirmed whether ReservedTxns will be included in a future XRPL amendment.

The transaction reservation scheme adds to a series of technical updates under discussion for XRPL, including amendments targeting automated market maker functionality, hook-based smart contract features, and sidechain interoperability. Industry observers tracking the network's governance noted that any ReservedTxns amendment would need to pass through the XRPL amendment process, which requires 80% validator support over a two-week review window before becoming active.