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1 billion DOTs were minted out of thin air, but the hacker only made 230,000 dollars
Author: Zhou, ChainCatcher
On April 13th at 10 AM Beijing time, the on-chain monitoring platform issued alerts: there was an abnormal issuance of bridged assets on the Ethereum network from Polkadot.
According to analysis by CertiK, the attacker submitted a carefully crafted cross-chain request to the HandlerV1 contract on the Ethereum side through the ISMP protocol of Hyperbridge, along with a historically accepted real MMR proof, successfully bypassing the verification mechanism.
BlockSec Phalcon subsequently released a technical alert, classifying this vulnerability as an MMR proof replay vulnerability. According to their analysis, the root of the vulnerability lies in the fact that the replay protection of the HandlerV1 contract only verifies whether the hash of a certain request has been used before, but the proof verification process does not bind the submitted request payload to the verified proof.
This logical gap allowed the attacker to replay a historically valid proof and pair it with a newly constructed malicious request, thus executing the ChangeAssetAdmin operation through the TokenGateway.onAccept() path, transferring the admin and minting rights of the wrapped DOT contract on Ethereum (address: 0x8d...8F90b8) to an address controlled by the attacker.
According to on-chain data, after obtaining minting rights, the attacker minted 1 billion bridged DOT, which was approximately 2805 times the reported circulating supply of about 356,000 of that token on Ethereum at the time.
Subsequently, the attacker exchanged all chips for about 108.2 ETH through the Odos Router and Uniswap V4 liquidity pool, transferring it to the attacker's external account, realizing a profit of about $237,000 based on the price at that time, with the entire attack consuming only about $0.74 in gas fees.
BlockSec Phalcon also mentioned that there had been a previous attack using the same method, targeting MANTA and CERE tokens, resulting in a loss of about $12,000. The total loss from both attacks amounted to approximately $242,000.
After the incident, leading South Korean exchanges Upbit and Bithumb announced the suspension of deposit and withdrawal services for DOT and AssetHub Polkadot network to prevent potential fake deposit risks.
Polkadot officials stated that this vulnerability only affects DOT bridged to Ethereum via Hyperbridge and does not impact DOT assets within the Polkadot ecosystem or DOT transferred through other cross-chain bridges. Polkadot and its parachains, as well as native DOT, remain secure and unaffected. Currently, Hyperbridge has been suspended to investigate the issue.
It is worth mentioning that although the minting scale reached 1 billion, the actual loss was far lower than the theoretical figure. Due to the extremely limited on-chain liquidity of wrapped DOT on Ethereum, the concentrated sell-off of 1 billion tokens instantly crashed the price of wrapped DOT from $1.22 to $0.00012831, a drop of 99.98%, rendering most tokens ineffective for liquidation.
According to CoinMarketCap data, the price of the native DOT token also briefly dropped nearly 5% due to market sentiment.
Users on X candidly stated that who would have thought the cross-chain myth DOT, which once stood alongside Ethereum, would explode on social media in this way. Cross-chain bridges have once again become the "Achilles' heel" of the crypto world, transforming from a previously neglected area into a scene of devastation. When 1 billion DOT appeared out of nowhere, all technical indicators became worthless.
Some users jokingly remarked that the low liquidity saved Polkadot this time, keeping the actual loss around $237,000.
However, the low liquidity of bridged assets, while limiting the hacker's profits, exposed the potential vulnerabilities of the cross-chain interoperability layer.
It is reported that Hyperbridge, developed by Polytope Labs, is a cross-chain interoperability project within the Polkadot ecosystem, which has long relied on cryptographic proofs instead of multi-signature committees as its core security mechanism, positioning itself as a trust-minimized cross-chain infrastructure. The project had previously emphasized its resistance to common bridge attacks.
But this incident may indicate that the integrity of the cryptographic proof mechanism alone is not sufficient to ensure security; the specific implementation logic of the Gateway contract on the Ethereum side also constitutes an attack surface.
From a broader perspective, this incident reflects the ongoing severe security situation in DeFi since 2026. Several significant attacks have occurred this year, including Venus generating $2.15 million in bad debt due to price manipulation, Resolve over-minting 80 million USR, and Drift being hacked for over $285 million in assets, with various attack methods and a wide range of affected areas.
Taking over minting rights for unlimited issuance is not a new attack model. However, due to the extremely shallow liquidity of Hyperbridge, the losses were unexpectedly minimized.
According to CertiK data, there were 46 recorded security incidents in March alone, with total losses of approximately $39.8 million, marking the highest monthly record since November 2024. CertiK also pointed out that the frequency of code vulnerability exploitation has increased, possibly related to the rise of AI-assisted vulnerability discovery tools.
The rise in attack frequency is also prompting the industry to re-examine the boundaries of security and regulation. Circle's Chief Strategy Officer Dante Disparte previously called for protocols, wallets, exchanges, and stablecoin issuers to view security and accountability as a shared obligation in response to the Drift Protocol theft incident, suggesting that DeFi protocols could develop on-chain technical protection measures referencing traditional market circuit breaker mechanisms and promote relevant legislation to incorporate property rights and financial privacy protection standards into law before the next major incident occurs.
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The X Chat will be available for download on the App Store this Friday. The media has already covered the feature list, including self-destructing messages, screenshot prevention, 481-person group chats, Grok integration, and registration without a phone number, positioning it as the "Western WeChat." However, there are three questions that have hardly been addressed in any reports.
There is a sentence on X's official help page that is still hanging there: "If malicious insiders or X itself cause encrypted conversations to be exposed through legal processes, both the sender and receiver will be completely unaware."
No. The difference lies in where the keys are stored.
In Signal's end-to-end encryption, the keys never leave your device. X, the court, or any external party does not hold your keys. Signal's servers have nothing to decrypt your messages; even if they were subpoenaed, they could only provide registration timestamps and last connection times, as evidenced by past subpoena records.
X Chat uses the Juicebox protocol. This solution divides the key into three parts, each stored on three servers operated by X. When recovering the key with a PIN code, the system retrieves these three shards from X's servers and recombines them. No matter how complex the PIN code is, X is the actual custodian of the key, not the user.
This is the technical background of the "help page sentence": because the key is on X's servers, X has the ability to respond to legal processes without the user's knowledge. Signal does not have this capability, not because of policy, but because it simply does not have the key.
The following illustration compares the security mechanisms of Signal, WhatsApp, Telegram, and X Chat along six dimensions. X Chat is the only one of the four where the platform holds the key and the only one without Forward Secrecy.
The significance of Forward Secrecy is that even if a key is compromised at a certain point in time, historical messages cannot be decrypted because each message has a unique key. Signal's Double Ratchet protocol automatically updates the key after each message, a mechanism lacking in X Chat.
After analyzing the X Chat architecture in June 2025, Johns Hopkins University cryptology professor Matthew Green commented, "If we judge XChat as an end-to-end encryption scheme, this seems like a pretty game-over type of vulnerability." He later added, "I would not trust this any more than I trust current unencrypted DMs."
From a September 2025 TechCrunch report to being live in April 2026, this architecture saw no changes.
In a February 9, 2026 tweet, Musk pledged to undergo rigorous security tests of X Chat before its launch on X Chat and to open source all the code.
As of the April 17 launch date, no independent third-party audit has been completed, there is no official code repository on GitHub, the App Store's privacy label reveals X Chat collects five or more categories of data including location, contact info, and search history, directly contradicting the marketing claim of "No Ads, No Trackers."
Not continuous monitoring, but a clear access point.
For every message on X Chat, users can long-press and select "Ask Grok." When this button is clicked, the message is delivered to Grok in plaintext, transitioning from encrypted to unencrypted at this stage.
This design is not a vulnerability but a feature. However, X Chat's privacy policy does not state whether this plaintext data will be used for Grok's model training or if Grok will store this conversation content. By actively clicking "Ask Grok," users are voluntarily removing the encryption protection of that message.
There is also a structural issue: How quickly will this button shift from an "optional feature" to a "default habit"? The higher the quality of Grok's replies, the more frequently users will rely on it, leading to an increase in the proportion of messages flowing out of encryption protection. The actual encryption strength of X Chat, in the long run, depends not only on the design of the Juicebox protocol but also on the frequency of user clicks on "Ask Grok."
X Chat's initial release only supports iOS, with the Android version simply stating "coming soon" without a timeline.
In the global smartphone market, Android holds about 73%, while iOS holds about 27% (IDC/Statista, 2025). Of WhatsApp's 3.14 billion monthly active users, 73% are on Android (according to Demand Sage). In India, WhatsApp covers 854 million users, with over 95% Android penetration. In Brazil, there are 148 million users, with 81% on Android, and in Indonesia, there are 112 million users, with 87% on Android.
WhatsApp's dominance in the global communication market is built on Android. Signal, with a monthly active user base of around 85 million, also relies mainly on privacy-conscious users in Android-dominant countries.
X Chat circumvented this battlefield, with two possible interpretations. One is technical debt; X Chat is built with Rust, and achieving cross-platform support is not easy, so prioritizing iOS may be an engineering constraint. The other is a strategic choice; with iOS holding a market share of nearly 55% in the U.S., X's core user base being in the U.S., prioritizing iOS means focusing on their core user base rather than engaging in direct competition with Android-dominated emerging markets and WhatsApp.
These two interpretations are not mutually exclusive, leading to the same result: X Chat's debut saw it willingly forfeit 73% of the global smartphone user base.
This matter has been described by some: X Chat, along with X Money and Grok, forms a trifecta creating a closed-loop data system parallel to the existing infrastructure, similar in concept to the WeChat ecosystem. This assessment is not new, but with X Chat's launch, it's worth revisiting the schematic.
X Chat generates communication metadata, including information on who is talking to whom, for how long, and how frequently. This data flows into X's identity system. Part of the message content goes through the Ask Grok feature and enters Grok's processing chain. Financial transactions are handled by X Money: external public testing was completed in March, opening to the public in April, enabling fiat peer-to-peer transfers via Visa Direct. A senior Fireblocks executive confirmed plans for cryptocurrency payments to go live by the end of the year, holding money transmitter licenses in over 40 U.S. states currently.
Every WeChat feature operates within China's regulatory framework. Musk's system operates within Western regulatory frameworks, but he also serves as the head of the Department of Government Efficiency (DOGE). This is not a WeChat replica; it is a reenactment of the same logic under different political conditions.
The difference is that WeChat has never explicitly claimed to be "end-to-end encrypted" on its main interface, whereas X Chat does. "End-to-end encryption" in user perception means that no one, not even the platform, can see your messages. X Chat's architectural design does not meet this user expectation, but it uses this term.
X Chat consolidates the three data lines of "who this person is, who they are talking to, and where their money comes from and goes to" in one company's hands.
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The era of "mass coin distribution" on public chains comes to an end
Soaring 50 times, with an FDV exceeding 10 billion USD, why RaveDAO?
After the blockade of the Strait of Hormuz, when will the war end?
Before using Musk's "Western WeChat" X Chat, you need to understand these three questions
The X Chat will be available for download on the App Store this Friday. The media has already covered the feature list, including self-destructing messages, screenshot prevention, 481-person group chats, Grok integration, and registration without a phone number, positioning it as the "Western WeChat." However, there are three questions that have hardly been addressed in any reports.
There is a sentence on X's official help page that is still hanging there: "If malicious insiders or X itself cause encrypted conversations to be exposed through legal processes, both the sender and receiver will be completely unaware."
No. The difference lies in where the keys are stored.
In Signal's end-to-end encryption, the keys never leave your device. X, the court, or any external party does not hold your keys. Signal's servers have nothing to decrypt your messages; even if they were subpoenaed, they could only provide registration timestamps and last connection times, as evidenced by past subpoena records.
X Chat uses the Juicebox protocol. This solution divides the key into three parts, each stored on three servers operated by X. When recovering the key with a PIN code, the system retrieves these three shards from X's servers and recombines them. No matter how complex the PIN code is, X is the actual custodian of the key, not the user.
This is the technical background of the "help page sentence": because the key is on X's servers, X has the ability to respond to legal processes without the user's knowledge. Signal does not have this capability, not because of policy, but because it simply does not have the key.
The following illustration compares the security mechanisms of Signal, WhatsApp, Telegram, and X Chat along six dimensions. X Chat is the only one of the four where the platform holds the key and the only one without Forward Secrecy.
The significance of Forward Secrecy is that even if a key is compromised at a certain point in time, historical messages cannot be decrypted because each message has a unique key. Signal's Double Ratchet protocol automatically updates the key after each message, a mechanism lacking in X Chat.
After analyzing the X Chat architecture in June 2025, Johns Hopkins University cryptology professor Matthew Green commented, "If we judge XChat as an end-to-end encryption scheme, this seems like a pretty game-over type of vulnerability." He later added, "I would not trust this any more than I trust current unencrypted DMs."
From a September 2025 TechCrunch report to being live in April 2026, this architecture saw no changes.
In a February 9, 2026 tweet, Musk pledged to undergo rigorous security tests of X Chat before its launch on X Chat and to open source all the code.
As of the April 17 launch date, no independent third-party audit has been completed, there is no official code repository on GitHub, the App Store's privacy label reveals X Chat collects five or more categories of data including location, contact info, and search history, directly contradicting the marketing claim of "No Ads, No Trackers."
Not continuous monitoring, but a clear access point.
For every message on X Chat, users can long-press and select "Ask Grok." When this button is clicked, the message is delivered to Grok in plaintext, transitioning from encrypted to unencrypted at this stage.
This design is not a vulnerability but a feature. However, X Chat's privacy policy does not state whether this plaintext data will be used for Grok's model training or if Grok will store this conversation content. By actively clicking "Ask Grok," users are voluntarily removing the encryption protection of that message.
There is also a structural issue: How quickly will this button shift from an "optional feature" to a "default habit"? The higher the quality of Grok's replies, the more frequently users will rely on it, leading to an increase in the proportion of messages flowing out of encryption protection. The actual encryption strength of X Chat, in the long run, depends not only on the design of the Juicebox protocol but also on the frequency of user clicks on "Ask Grok."
X Chat's initial release only supports iOS, with the Android version simply stating "coming soon" without a timeline.
In the global smartphone market, Android holds about 73%, while iOS holds about 27% (IDC/Statista, 2025). Of WhatsApp's 3.14 billion monthly active users, 73% are on Android (according to Demand Sage). In India, WhatsApp covers 854 million users, with over 95% Android penetration. In Brazil, there are 148 million users, with 81% on Android, and in Indonesia, there are 112 million users, with 87% on Android.
WhatsApp's dominance in the global communication market is built on Android. Signal, with a monthly active user base of around 85 million, also relies mainly on privacy-conscious users in Android-dominant countries.
X Chat circumvented this battlefield, with two possible interpretations. One is technical debt; X Chat is built with Rust, and achieving cross-platform support is not easy, so prioritizing iOS may be an engineering constraint. The other is a strategic choice; with iOS holding a market share of nearly 55% in the U.S., X's core user base being in the U.S., prioritizing iOS means focusing on their core user base rather than engaging in direct competition with Android-dominated emerging markets and WhatsApp.
These two interpretations are not mutually exclusive, leading to the same result: X Chat's debut saw it willingly forfeit 73% of the global smartphone user base.
This matter has been described by some: X Chat, along with X Money and Grok, forms a trifecta creating a closed-loop data system parallel to the existing infrastructure, similar in concept to the WeChat ecosystem. This assessment is not new, but with X Chat's launch, it's worth revisiting the schematic.
X Chat generates communication metadata, including information on who is talking to whom, for how long, and how frequently. This data flows into X's identity system. Part of the message content goes through the Ask Grok feature and enters Grok's processing chain. Financial transactions are handled by X Money: external public testing was completed in March, opening to the public in April, enabling fiat peer-to-peer transfers via Visa Direct. A senior Fireblocks executive confirmed plans for cryptocurrency payments to go live by the end of the year, holding money transmitter licenses in over 40 U.S. states currently.
Every WeChat feature operates within China's regulatory framework. Musk's system operates within Western regulatory frameworks, but he also serves as the head of the Department of Government Efficiency (DOGE). This is not a WeChat replica; it is a reenactment of the same logic under different political conditions.
The difference is that WeChat has never explicitly claimed to be "end-to-end encrypted" on its main interface, whereas X Chat does. "End-to-end encryption" in user perception means that no one, not even the platform, can see your messages. X Chat's architectural design does not meet this user expectation, but it uses this term.
X Chat consolidates the three data lines of "who this person is, who they are talking to, and where their money comes from and goes to" in one company's hands.
The help page sentence has never been just technical instructions.
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