Solana’s blockchain network is getting a security boost. Marinade Finance, one of its key protocols, has introduced a new set of tools designed to hold malicious validators accountable. The update comes amid growing concerns about sandwich attacks—an exploit that allows validators to manipulate transactions for profit at the expense of unsuspecting traders.

The fresh measures aim to improve trust in Solana’s staking ecosystem by penalizing validators who use their privileged position to extract unfair gains. The tools include both blacklisting capabilities and slashing mechanisms that reduce rewards for validators caught engaging in suspicious behavior.

This initiative signals a broader shift within Solana’s ecosystem as it grapples with persistent validator-related challenges. By taking stronger action against bad actors, Solana and its partners are trying to balance decentralization with accountability.

What Are Sandwich Attacks?

A sandwich attack is a type of front-running where a validator, or anyone with control over transaction ordering, places a buy order just before a user’s transaction and a sell order immediately after. This way, the attacker benefits from the price change caused by the user’s trade. These tactics are often carried out so quickly that retail users don’t notice—until they realize they’ve gotten a worse price than expected.

Validators are uniquely positioned to perform these attacks because they control the order in which transactions are processed on the blockchain. In networks like Solana that prioritize speed, the potential for abuse can be particularly high.

Marinade Finance recently uncovered multiple sandwich attacks originating from validators receiving SOL tokens through its Stake Auction Marketplace. The platform responded by developing blacklisting protocols to remove these validators from its network and implementing slashing tools to cut their rewards if they continue misbehaving.

Marinade Select: Curated Security

To address this issue more broadly, Marinade also introduced “Marinade Select,” a curated list of trusted validators. The goal is to give users and other staking protocols a safer option when delegating their SOL. By offering a vetted list, Marinade is essentially guiding delegators away from risky validators and toward those with transparent behavior.

This curated approach aligns with growing industry calls for better feedback mechanisms in staking. Solana co-founder Anatoly Yakovenko voiced his support for the initiative, especially in the context of liquid staking platforms like Marinade, Jito, and Lido. According to Yakovenko, these protocols are in the best position to monitor validator performance and ensure that harmful behavior doesn’t go unchecked.

In his statement, Yakovenko said that integrating performance data into staking decisions would help improve the network’s overall integrity. It would also allow the community to build stronger tools that protect users from exploitative practices.

Solana’s Validator Dilemma

While Marinade’s new tools represent progress, the underlying challenges in Solana’s validator ecosystem remain complex. One key issue is economic: maintaining a validator node requires significant fixed costs, including hardware, uptime, and operational security. As a result, some validators may feel tempted to engage in unethical behavior simply to stay afloat.

To deal with this, the Solana Foundation has been reevaluating its validator delegation program. In April, the Foundation took steps to remove smaller validators from the delegation list, redirecting funds toward those with better performance metrics. While controversial, the move aims to ensure that delegated tokens support sustainable and ethical validators.

Still, this process is far from straightforward. Solana has historically positioned itself as a decentralized, performance-first blockchain. Ensuring decentralization while enforcing quality and honesty among validators requires a delicate balance. With more tools now available to identify and penalize bad actors, the ecosystem is beginning to evolve in a way that prioritizes user trust without centralizing too much power.

Strengthening the Network Through Transparency

The proactive stance taken by Marinade Finance may signal a trend toward more transparent validator practices across other blockchain ecosystems. While sandwich attacks are not unique to Solana, addressing them at the protocol level is a relatively new strategy.

By incorporating validator metrics into staking protocols and making validator slashing more responsive, Solana-based platforms are aiming to build a safer trading and staking environment. These efforts are also in line with broader industry trends toward increased accountability and user protection.

More blockchains are beginning to adopt similar approaches. Ethereum’s staking protocols, for instance, are also working on ways to detect and penalize malicious validator behavior. Solana’s move could set a precedent for fast-moving networks that deal with high transaction throughput and face more frequent opportunities for front-running and manipulation.

Looking Ahead

As the crypto industry matures, investor demand for transparency, fairness, and trust will only grow. Protocols like Marinade Finance are recognizing this and acting accordingly. By tightening control over validator behavior and reinforcing its commitment to fair market access, Solana is strengthening its position as one of the most dynamic layer-1 blockchains.

While it’s still early days for these new validator tools, the willingness to adapt and innovate within Solana’s community is clear. Over the coming months, the effectiveness of these blacklisting and slashing tools will be tested as more validators either comply with the new standards or face consequences.

For traders, investors, and developers, the message is simple: Solana is taking steps to ensure its ecosystem remains safe, fast, and reliable. And with growing support from protocol leaders and community members alike, Marinade’s validator reform could be just the beginning of a broader movement toward responsible staking in Web3.