$3.2 Million Liquid Network Incident: After the First Line of Defense Falls, What Can Digital Asset Platforms Still Protect?

Recent security incidents have once again brought the digital asset industry back to a familiar question: what does it actually take for a platform to be considered "secure"?

In early September, a major security incident occurred on the Bitcoin sidechain Liquid Network, in which attackers exploited a validation vulnerability in the Elements software, resulting in approximately 4,000 BTC — worth about $320 million at the time of the incident — being transferred out. Notably, the relevant PAK and Federation keys themselves were not compromised. This brings a more worth-discussing question to the surface: when the keys themselves are not compromised, why can an asset transfer that should never have happened still pass through the system?

Similar risks have appeared in other areas. In August, attackers exploited a critical security vulnerability in Cosmos EVM to launch attacks on multiple networks, with 6 networks actually exploited, and the relevant vulnerability had previously been reported through a bug bounty program. In July, Triple-A suffered a social engineering attack, in which attackers obtained the credentials of relevant personnel and further entered the operational environment, ultimately resulting in some of the company's own assets being transferred out. However, because client funds are held separately in trust accounts and isolated from the compromised operational environment, they were not affected.

The causes of the three incidents were not the same, yet they all point to a more realistic question: security incidents may be difficult to avoid entirely, but once one link among code, personnel, and permissions is breached, where exactly does the risk stop?

What really needs to be defended against is not just "being breached," but how far the risk can travel

A question more worth asking than "whether there was an attack" is: after the first line of defense fails, how far can the attacker still go? Is the compromise of one account enough to complete critical asset operations? If one permission is breached, can the attacker continue into more core systems? When problems arise in the online environment, how many core assets are actually exposed along the attack path?

This is also an important insight from several recent incidents: how much impact an attack ultimately causes depends not only on what the attacker breached, but also on how many lines of defense remain in the system after the breach.

If, after one account is compromised, core permissions can be directly reached; if a problem in one online environment can directly affect a large number of core assets, then any weak link can be rapidly amplified. Conversely, if there are multiple layers of isolation between permissions, critical operations, risk monitoring, and asset storage, then a single breach may not necessarily escalate into a total collapse.

In other words, measuring a platform's security capability is not just about whether "the first door can be held," but also about how many doors remain after the first door falls.

Following the attack chain, where is BIT's "next door"?

Recently, global digital financial services platform BIT (formerly Matrixport) released the "BIT Trust Whitepaper" V2.0 (https://www.bit.com/whitepaper). If we reread this whitepaper along the question of "what happens after the first line of defense fails," one noteworthy point is that BIT's security system does not rely on any single line of defense, but instead sets up multiple layers of protection among identity, permissions, operations, and assets.

For example, the acquisition of an account credential does not mean the attacker has all the permissions needed to complete critical asset operations. According to the whitepaper, BIT uses the principle of least privilege to limit the systems and scope of operations employees can access; critical operations involving asset transfers, account security, permission changes, and the generation and review of trading instructions require the joint participation of at least two authorized personnel. Taking Cactus Custody as an example, this layered approach also extends to institutional-grade digital asset custody scenarios.

Passing identity verification does not mean subsequent operations get a "green light" all the way through. BIT continuously monitors abnormal logins, abnormal devices, abnormal withdrawals, and other behaviors; on the asset side, most digital assets are stored in cold wallets, further reducing the exposure of core assets when problems arise in the online environment.

Putting these mechanisms together, BIT's security logic becomes more intuitive: one identity being breached does not equal obtaining all permissions; obtaining one permission does not equal being able to independently complete critical operations; passing identity verification does not equal subsequent behavior no longer being subject to risk judgment; and problems in the online environment do not equal all core assets being exposed at the same time.

What truly determines how far an attack can ultimately go is precisely these "does not equals." This does not mean that any kind of attack can be completely avoided, but it does mean that even if one line of defense has a problem, there are still opportunities afterward to identify anomalies, restrict permissions, or isolate risk.

The security gap is, in many cases, hidden after the first door falls.

When risk is discovered, who has the authority to actually press the "stop" button?

But having a few more technical lines of defense is still not the whole story. In the Cosmos EVM incident, a noteworthy detail is that the relevant vulnerability had previously been reported through a bug bounty program, but based on the information available at the time, it was initially judged that it would not cause fund losses on known production network configurations.

This also exposes another often-overlooked problem: discovering risk does not mean the risk has been accurately assessed and adequately handled.

After a vulnerability is submitted, who determines how severe it is? If the security team believes the risk is unacceptable, do they have the authority to stop the product from continuing to launch? When business progress conflicts with security judgment, who has the final say?

According to the "BIT Trust Whitepaper" V2.0, when product plans, requirements, architecture, or launch changes involve major security risks, or do not comply with security baselines and compliance requirements, the security team has a "veto power" and can suspend related activities and require rectification and re-review before proceeding further.

What is truly noteworthy about this mechanism is not just that there is an extra approval step, but that it answers a very practical question: when risk really appears, does anyone have the authority to say "no"? For a security system, the ability to discover problems is certainly important, but enabling security judgment to truly influence business decisions likewise determines whether a line of defense is merely written into policy or can actually work.

As business becomes more complex, "security" is not just the assets in a wallet

As digital financial platforms begin to simultaneously connect different types of assets and financial infrastructure such as digital assets, U.S. equities, and RWA, security issues no longer occur only at the wallet and account level. Who handles assets, which institutions they pass through, and where they are cleared and held have likewise become an important part of users' risk assessment.

This is also where the "BIT Trust Whitepaper" V2.0 further elaborates on its security and trust system. In addition to risk control and security measures, the whitepaper also discloses the regulatory, audit, and independent verification arrangements corresponding to different business entities, allowing outsiders to further judge: who is responsible for what, which mechanisms can be verified, and how far these mechanisms cover.

Taking BIT's U.S. equities business as an example, its securities business is operated by Matrix Gelephu Pte. Ltd. and regulated by GFSO, and the related business also connects to U.S.-licensed financial institutions and the corresponding clearing and custody infrastructure.

For ordinary users, these seemingly complex financial arrangements can ultimately come down to a few very simple questions: who handles my assets? What steps do they go through? What are the respective responsibilities of different institutions? Can the identities and regulatory status of these institutions be verified?

This is also where "verifiability" truly becomes meaningful — security cannot rely only on what the platform itself says, but also on what users and outsiders can verify.

Looking back at Liquid Network, Cosmos EVM, and Triple-A, the entry points of the three incidents were completely different, yet all remind the market: no line of defense should be assumed to never fail. What truly creates a security gap may not be a single security technology itself, but who can establish enough isolation and checks and balances among identity, permissions, operations, assets, and organizational decision-making, so that a localized breach is less likely to escalate into a total collapse.

From this perspective, what is noteworthy about the "BIT Trust Whitepaper" V2.0 is not just how many security measures it lists, but whether these measures can be connected into a complete defense system: if one link has a problem, there is still the next layer; if the next layer has a problem, there are still opportunities to continue identifying, blocking, and isolating risk.

For digital asset platforms, "never having been attacked" may be difficult to make a permanent promise. But another thing can be continuously built: true security is that even if one line of defense fails, a single breach is not allowed to easily escalate into a total collapse. And when these lines of defense not only exist but can also be continuously verified by outsiders, "trust" is no longer just something the platform says about itself.