Front-running in DeFi: Causes, Consequences, and Countermeasures
August 23, 2023
Unvest blog

Introduction

In the open landscapes of decentralized finance, the menace of front-running bots looms large. These exploitative strategies threaten the integrity of DeFi platforms, challenging project founders to maintain trust and fairness. This detailed guide delves into the causes, consequences, and most importantly, countermeasures against front-running in DeFi.

Unpacking Front-running

Consequences of Front-running

  1. User Exploitation: Regular users can get worse trade execution prices because of front-runners, potentially leading to significant losses.
  2. Reduced Trust: Continual front-running diminishes trust in DeFi platforms, deterring newcomers and shaking confidence in existing users.
  3. Inefficient Markets: Price discovery mechanisms get skewed, leading to less efficient markets.

Data Insight: A study showed that front-running bots extracted approximately $314 million in value from DeFi users across 18 months.

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Countermeasures Against Front-running

  1. Commit-Reveal Schemes: Users first commit to a transaction without revealing details. Once collected, transactions are revealed and processed, denying bots the ability to front-run based on transaction data.
  2. Priority Gas Auctions (PGA): Rather than letting users set gas fees, PGA involves protocols setting them dynamically based on demand.
  3. Time-locked Transactions: By enforcing a mandatory time delay, users get a window to cancel if they suspect potential front-running.
  4. Randomized Transaction Ordering: Introducing randomness in transaction order, irrespective of gas fees, can mitigate predictability, making front-running difficult.
  5. Using Layer 2 Solutions: Off-chain solutions, like zkRollups, can bundle numerous transactions together, effectively hiding individual transaction details from public view.
  6. Economic Design: Some platforms impose heavy penalties on suspected front-runners, discouraging such behavior through economic disincentives.

Conclusion

Front-running, a challenge borrowed from traditional finance, has found its way into DeFi, with profound implications. However, through technological innovations and strategic countermeasures, project founders can effectively combat this threat. Vigilance, coupled with the relentless evolution of protective mechanisms, will ensure the DeFi space remains equitable and trust-worthy.

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