David Schwartz Proposes Fix for XRP Ledger Front-Running Risk

TLDR

• David Schwartz proposed a transaction reservation system to reduce front-running on the XRP Ledger.
• XRPresso.io raised concerns about visible pending transactions being exploited before validation.
• The XRP Ledger queue allows participants to assess trades and attempt strategic positioning.
• Schwartz stated validators do not have structural advantages unless they conspire.
• He noted such manipulation would be visible on-chain and lead to validator removal.

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Ripple CTO Emeritus David Schwartz introduced a proposal to address front-running risks on the XRP Ledger network. The plan outlines a transaction reservation system that aims to secure execution priority for users. The proposal follows community concerns about visible pending trades and potential exploitation within the XRP Ledger ecosystem.

XRP Ledger Front-Running Concerns Gain Attention

XRPresso.io highlighted risks tied to transaction visibility on the XRP Ledger before validation and final settlement. It argued that validators and connected nodes can view pending trades and assess profit opportunities. Consequently, actors may attempt to position transactions strategically and extract value from normal user activity.

This is true, but is mitigated by a number of factors.

For one thing, everyone has an equal opportunity to do this. Transactions are publicly visible before a ledger closes.

Running a validator does not help you do this unless multiple validators conspire. If multiple…

— David ‘JoelKatz’ Schwartz (@JoelKatz) June 29, 2026

Moreover, the report explained that transactions remain in a visible queue until the ledger closes. This visibility allows participants to analyze potential price movements and submit competing entries. As a result, sophisticated operators may gain advantages over standard wallet users.

Additionally, XRPresso noted that transaction ordering follows a deterministic formula based on transaction hashes. Therefore, similar entries can increase the probability of favorable placement in final ordering. This mechanism, it said, could lead to systematic disadvantages for everyday traders using the XRP Ledger.

Schwartz Responds With Reservation Proposal

Schwartz acknowledged the concern but rejected claims that validators gain inherent structural advantages on the XRP Ledger. He stated that all participants can observe pending transactions under the same conditions. However, he added that coordinated validator actions would be visible and subject to removal from trusted lists.

“If multiple validators did conspire, it would be very obvious who was responsible,” Schwartz explained.

He also noted that such activity has not appeared beyond theoretical demonstrations. Furthermore, he stressed that profitability remains limited due to liquidity constraints and execution costs.

Schwartz then proposed a reservation mechanism to strengthen fairness within the XRP Ledger. Under this system, users submit a reservation transaction specifying a ledger sequence and transaction identifier. If successful, the system grants execution priority over later transactions formed after disclosure.

Debate Continues Over Visibility and Solutions

Schwartz said the reservation method ensures that transactions execute before any later competing orders.

He explained, “This guarantees execution ahead of transactions formed after disclosure.” As a result, users could reduce risks tied to sandwiching and front-running strategies.

However, XRPresso responded that the approach introduces additional costs and operational complexity for users. It argued that the proposal does not fully resolve visibility issues in the pre-validation stage. Instead, it suggested that confidentiality measures could provide a more direct solution.

A serious front-running issue continues on the XRPL that disadvantages regular users.

Validators and well-connected nodes can view transactions in the pre-validation queue before a ledger closes.

They can quickly analyze a pending trade, determine if front-running or…

— XRPresso.io (@xrpresso_io) June 29, 2026

Meanwhile, the broader industry continues to explore alternatives to front-running challenges across decentralized systems. Binance co-founder Changpeng Zhao previously suggested a dark pool perpetuals exchange using zero-knowledge proofs. Still, critics argued that hidden order systems may recreate insider advantages that blockchain systems aim to remove.