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Alex bridge on BNB Smart Chain drained of $4.3M after suspicious upgrade — CertiK

The deployer account changed an Alex contract’s implementation address, and multiple tokens were subsequently drained from its bridge.

According to a May 14 report from blockchain security platform CertiK, the Alex protocol bridge on the BNB Smart Chain network suffered $4.3 million in suspicious withdrawals just after its contract was suddenly upgraded.

Alex is a Bitcoin layer-2 protocol. According to its official website, it provides decentralized finance applications on Bitcoin. Its bridges are used to transfer assets from other networks, such as BNB Smart Chain and Ethereum, to its own network.

Blockchain data confirms that the Alex deployer account performed five identical upgrades to the “Bridge Endpoint” contract on BNB Smart Chain beginning at 3:56 pm UTC. Approximately $4.3 million worth of Binance-Pegged Bitcoin (BTC), USD Coin (USDC), and Sugar Kingdom Odyssey (SKO) were subsequently removed from the BNB Smart Chain side of the bridge.

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Hybrid L2 Build on Bitcoin Launches Mainnet; US Users Face Geo-Blocking

Hybrid L2 Build on Bitcoin Launches Mainnet; US Users Face Geo-BlockingThe layer-two initiative known as BOB, short for ‘Build on Bitcoin,’ has declared its mainnet operational with over 40 apps launching in the initial phase. Notably, the BOB application that facilitates bridging and access to the ecosystem is geo-blocked in the United States. BOB Mainnet Activates, Project Expects a ‘Bitcoin-Driven Defi Summer’ On May 1, […]

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Vitalik Buterin Among Several High-Profile Names With Over $1 Million Locked in Bridges

Vitalik Buterin Among Several High-Profile Names With Over  Million Locked in BridgesVitalik Buterin, co-founder of Ethereum, reportedly has over $1 million trapped in the Optimism bridge, a situation highlighted in a broader analysis by Arkham, which exposes numerous wallets with significant funds locked on various bridge contracts. Among these, a wallet associated with Bofur Capital has $1.8 million in wrapped Bitcoin stuck on an Arbitrum bridge […]

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Bitcoin needs Ethereum VM to reach its full potential — Web3 exec

Botanix Labs founder Willem Schroé argues a “huge amount of value” from real-world assets will be captured on Bitcoin, provided it connects to the Ethereum Virtual Machine.

Mainstream Bitcoin (BTC) adoption won’t happen until it bridges to the Ethereum Virtual Machine (EVM) — the first point of entry for many real-world assets moving on-chain, a Web3 executive argues.

Speaking to Cointelegraph, the founder of cross-chain infrastructure firm Botanix Labs, Willem Schroé, claimed Bitcoin “needs to start playing in the EVM world” for it to build real-world use cases to increase its adoption and utility.

“Bitcoin is the most technologically secure and truly decentralized protocol [and] the EVM has proven itself to be the application layer for the global financial system,” Schroé said.

While Bitcoin is typically used as a peer-to-peer payment system or for storing value, Schroé said its potential won’t be fulfilled unless the cryptocurrency can connect to the broader financial system, such as with security and commodity markets.

Connecting Bitcoin to Ethereum-based real-world assets, stablecoins, decentralized finance and nonfungible tokens via the EVM is the first step in that direction, Schroé argued.

“That’s a huge amount of value and development waiting to happen.”

Schroé’s Botanix Labs aims to connect the Bitcoin and Ethereum ecosystems through its “Spiderchain” — a proof-of-stake layer 2 that implements EVM to EVM bridges to enable Bitcoin to interact with the EVM.

Staked assets are secured by a decentralized multisignature mechanism, and its design doesn’t require Bitcoin to be forked.

Schroé believes the current solutions involving wrapped Bitcoin on Ethereum and other EVM-compatible chains are problematic and argues they are susceptible to censorship and regulatory scrutiny, as they’re operated by the centralized United States-based company BitGo.

A similar proposal to bring Ethereum functionality to Bitcoin is also being proposed through “drivechains,” also known as the Bitcoin Improvement Proposal-300, which Bitcoin developers are again discussing. If implemented, it would allow “sidechains” to be built on the network.

On Oct. 9, Bitcoin developer Robin Linus released a white paper titled “BitVM: Compute Anything on Bitcoin,” which details how Ethereum-like optimistic rollup smart contracts could be made on the Bitcoin network.

Related: El Salvador’s Bitcoiners teach 12-year-olds how to send sats

Unlike the Spiderchain, BIP-300 would require Bitcoin to soft fork and would be activated by miners — similar to the Taproot soft fork in November 2021 that paved the way for the NFT-emulating Ordinals and BRC-20 tokens.

The BIP’s creator, Paul Sztroc, says those favoring BIP-300 believe it will offer new privacy and scaling use cases to Bitcoin, among other benefits.

However, not everyone likes the idea of expanding Bitcoin’s ecosystem beyond its current use cases.

Cory Klippsten, the CEO of BTC-only exchange Swan Bitcoin, believes drivechains and solutions that bring other assets to Bitcoin will bring an influx of scammers.

Saifedean Ammous, the author of The Bitcoin Standard, opposes the idea of issuing altcoins on Bitcoin, suggesting that “good money” is the only token needed.

However, Schroé said he thinks bringing together Bitcoin and Ethereum could produce a new array of applications “with decentralization and security as first principles.“

“EVM is the winning virtual machine, and Bitcoin is the best money,” he said.

Magazine: Ethereum is eating the world — ‘You only need one internet’

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Canto, Astar blockchains plan migration to Ethereum ecoystem as layer 2s

By inheriting Ethereum’s security, Canto will be more decentralized and will enable trustless guarantees when bridging assets over, Polygon Labs said.

Cosmos-native layer-1 blockchain Canto has become the latest chain to migrate to Ethereum as a layer 2 zero-knowledge rollup, after another layer-1 blockchain, Astar, announced similar plans moving from the Polkadot ecosystem to Ethereum.

Canto is a permissionless general-purpose blockchain, which is Ethereum Virtual Machine (EVM)-compatible with aims to onboard the traditional financial sector to decentralized finance applications.

Upon an official agreement reached by Canto Commons — a framework where contributors coordinate ideas and solutions to the protocol — its core developers will build a ZK rollup on Ethereum’s second layer, Polygon Labs explained on Sept. 18:

“By leveraging a shared ZK bridge, Canto will eventually tap the liquidity of a unified Polygon ecosystem with easy access to Ethereum.”

Polygon Labs said Canto will “inherit” Ethereum’s security, enabling more decentralization and trustless guarantees when bridging assets over:

“User security comes by way of a best-in-class and in-production ZK prover, meaning community security is ensured by cryptography and inherited from Ethereum, rather than the social-economic incentives of fraud proofs.”

There will be no changes to Canto’s validators or staking system, Polygon Labs added.

Canto follows moves from Astar

Canto joins the likes of Astar, Gnosis Pay, Palm and IDEX to have announced plans to build ZK layer 2s using Polygon’s Chain Development Kit in recent months, according to Polygon Labs co-founder Sandeep Nailwal.

On Sept. 13, the Astar team announced it will soon begin building its own Ethereum layer-2 scaling solution, named Astar ZK-Ethereum Virtual Machine (EVM), also using Polygon’s CDK.

“We are building a trustless bridge to Ethereum with high EVM equivalency right out-of-the-box, so dApp developers can use existing tools to build solutions across our entire ecosystem,” the Astar team explained in a Sept. 14 statement.

Polygon Labs hopes the ZK-powered chain will enable businesses to implement Web3 solutions with increased speed, scalability, and security in Japan — where Astar is based — and around the world.

Ryan Sean Adams, co-host of Ethereum show Bankless said the two most recent migrations to Ethereum could be the start of a rollup avalanche.

Not every protocol is sticking around on Ethereum

Meanwhile, some protocols appear to moving the other way.

Decentralized exchange dYdX announced its intention to build a “purely decentralized” order book exchange on Cosmos as part of a plan to migrate away from Ethereum in early September.

Another Ethereum-native protocol, Maker, signaled plans to move to cut ties with Ethereum and build a new, more “efficient” chain with Solana’s codebase in September too.

Related: Idealistic Ethereum community-built zkEVM Scroll launching in weeks

Maker’s co-founder Rune Chistensen added Solana currently stands as the “most promising” ecosystem to explore as it proved its resilience during the FTX debacle and has a high-quality pool of talent developers building on Solana.

Nonfungible token collection OnChainMonkey is also shifting its entire collection of 10,000 NFTs from Ethereum to Bitcoin. The team behind the protocol cited a more secure base layer and a thriving Bitcoin Ordinals ecosystem as the main reason behind the migration plan.

Magazine: DeFi Dad, Hall of Flame: Ethereum is ‘woefully undervalued’ but growing more powerful

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USDC will launch natively on Base network ‘next week’ — Jeremy Allaire

Circle announced that a Base version of its USDC stablecoin would be available soon, eventually eliminating the need for the USDbC bridged version.

Circle’s United States dollar stablecoin, USDC, will launch natively on the Base network “next week,” according to an Aug. 29 social media post from CEO Jeremy Allaire. The new version will replace the current US Dollar Base Coin (USDbC) that most users rely on as a substitute.

Coinbase’s Base network launched on Aug. 9. At the time, no native version of USDC existed on the network. Users could not deposit cash into a Circle account and receive equivalent USDC on Base. To solve this problem, the Base team allowed users to bridge USDC from Ethereum via an official bridge app. The token issued by the bridge is called “USDbC,” and is backed by native USDC locked on the Ethereum network.

The Aug. 29 announcement states that Circle will soon begin issuing USDC on Base, eventually doing away with the need for a bridged coin backed by the Ethereum version.

Related: Base project RocketSwap shares emergency plan following $865K exploit

According to an accompanying blog post, the contract for the new token has already been deployed to Base. On launch day, the team will explain how the current USDbC can be redeemed for native USDC. The team will also “work with ecosystem apps” to allow liquidity providers to “smoothly transition” to providing liquidity for the new coin, and the current Base bridge that issues USDbC will continue to operate normally for the time being.

The Circle team has not announced a specific date for the coin’s official launch, as Allaire stated only that it will happen sometime “next week.”

Base network gained over 136,000 active users on Aug. 10, the day after its launch. On August 25, Base announced it would share its revenue and partly govern the upcoming “Superchain” consisting of Base, Optimism, and other networks.

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Multichain victims search for answers in $1.5B exploit as new evidence emerges

Chinese police may have busted Multichain in a money laundering investigation, but many questions remain, including its CEO’s alleged fake ID.

On July 14, developers of the $1.5-billion Chinese cross-chain protocol Multichain confirmed users’ worst fears. The protocol’s CEO, identified only as “Zhaojun He,” was arrested by Chinese authorities in Kunming on May 21 after months of repeated denials on official communication channels. Also allegedly arrested was Multichain’s core team, which was operating in Shanghai. 

It was never disclosed why Zhaojun had been arrested or what the charges were. However, evidence suggests that Multichain funds may have been seized as part of an anti-money laundering operation in the context of a greater crackdown on crypto by Chinese authorities. In addition, an alleged fake ID used by the CEO to register Multichain’s operations only draws more questions. 

Multichain co-founder Alfred Xu assured that the development team was doing “just fine” on May 24 | Source: Telegram

Victims demand answers 

Despite their previous assurance of decentralization, the Multichain team revealed that the protocol’s multi-party computation servers and private keys were all under the exclusive control of Zhaojun, which were handed over to police. Without access to such items, the protocol had to shut down, and its team members were nowhere to be found. 

By the time of disclosure on July 14, $1.5 billion in total value locked on Multichain bridge remains inaccessible. An attempt to “rescue” users’ assets earlier that month also resulted in the arrest of Zhaojun’s sister, or so the development team says. Since the arrest began, funds on Multichain have been mysteriously swapped or bridged to unidentified wallets. 

Crypto investor ArkRide, who claims to have over $9,000 stuck in the Multichain protocol, founded a victims group shortly after the incident. The group now has over 300 members. 

ArkRide tells Cointelegraph that when the group formed, the members did not even know the names of key Multichain executives. Subsequently, one member shared a document from the Singapore government’s Accounting and Corporate Regulatory Authority alleged to be a Multichain business filing. The document lists “He Xiaokun,” a resident of Jiangsu Province, China, as the “Director” of the company. After seeing this document, some allege that “Zhaojun He” is in fact a pseudonym for “He Xiaokun.” (Chinese family names are written first.)

A Singaporean business filing for the principal business entity behind Multichain. Source: Telegram

Several Multichain victims reached out to Chinese embassies and the police in their home countries in an attempt to get further information, but received no response. 

Around the same time as user investigations, they were contacted by the Fantom Foundation, one of the largest users of the Multichain bridge prior to its collapse. Through several Telegram messages, sources at Fantom claimed that it has hired attorneys within China to assist in the recovery process and confirmed Multichain co-founder Zhaojun had been detained by Chinese police. 

“We’ve been gathering info from different parties and have contacted a Chinese law firm to get advice moving forward,” the source also claimed that some of the Multichain funds have been frozen by centralized exchanges and stablecoin issuers and that the foundation is attempting to get these funds distributed to victims. When asked about the possibility of a rug pull, the source wrote: “I do not believe the MC team misappropriated funds.”

On July 14, Fantom co-founder Andre Cronje stated that “Multichain was a big blow” to the network, as much of its total value locked consisted of Multichain derivative stablecoins. Stablecoin issuers Circle and Tether have frozen over $65 million in assets associated with the hack, according to blockchain data.

Cointelegraph reached out to the Fantom Foundation for comments but did not receive a response by the time of publication.

In a conversation with Cointelegraph, freelance content creator PJ Krypto claimed that he has lost a full month’s paycheck from a client as a result of his funds getting stuck inside the Multichain protocol. According to him, this happened on Aug. 1, nearly a month after the team had announced that the protocol should not be used. 

Multichain’s user interface gave no warning that it shouldn’t be used. (Aug. 23, 2023)

After his transfer took an unusually long time, PJ checked Multichain’s block explorer and noticed that it had an abnormally large amount of pending transactions. Alarmed, he then checked the protocol’s social media accounts.

“Nearly, my jaw dropped to the ground when I started reading everything,” he stated, continuing:

“I don’t know, I guess, sometimes, you just kinda get comfortable. You’ve used something before, and it just works. And you get a little lackadaisical, and I think that’s where I got victimized […] the silly thing is, I could have just sent it to a centralized exchange.”

The content creator stated that his paycheck is still stuck in the Multichain protocol. As a result, he has been unable to pay his team for subcontracted work they performed for him in July and will likely have to catch up these payments out of revenue from August. “It was a tough pill for them to swallow. I mean, they have bills, right? And I’m behind now on my bills for my content creation.”

ArkRide lost over $9,000 worth of crypto in Multichain on July 15 under similar circumstances. He expressed relief that his loss from the hack was small and stated that he has met others who fared much worse:

“My amount that I lost on Multichain is not as much as some people that I talked to lost because there were people who lost nearly half a million. I talked to a couple of guys who lost like $100K each, and there were some people who literally couldn’t stand from their beds, they told me they wanted to commit suicide or something like this.”

The investigation continues

The Chinese national ID system reveals concerning information on who is the actual director of Multichain. A Chinese national ID is a 15- or 18-digit number containing an individual’s residing jurisdiction, date of birth and gender.

A query revealed that the individual listed as “He Xiaokun” in Multichain’s Singaporean registration documents was born on May 10, 1955. The same search for “Yang Qiumei,” another director listed on the Multichain registration file, reveals the said individual to have been born on July 20, 1957. Xu Ruduo, the third director of Multichain — possibly referring to co-founder Alfred Xu — registered using a different type of ID. Alfred Xu has been unreachable since the arrest of his colleague.

The ID search query revealed that “He Xiaokun,” an individual listed as a Multichain director, is currently 68 years old and lives in a village in Jiangsu. Source: ID Search

By inspection, Zhaojun appears far too young to fit the profile of either “He Xiaokun,” age 68, or Yang Qiumei, 66. Both individuals had been indicated as residing in the same address at a rural Chinese village. 

A photo of Zhaojun circulated during his participation in the crypto project Fusion, circa 2017, and was previously his profile picture of his official Twitter account. Dejun Qian, co-founder of Fusion, confirmed Zhaojun was in charge of Multichain during the time of the incident. The two were previously involved in a business dispute regarding Multichain, when it was formerly known as Anyswap. 

Zhaojun He as listed in Fusion’s developer team. His biography reads: “More than 10 years of experience in secure Linux R&D. Former technical director of Chinese leading security operating system. Received bachelor of software engineering, Dalian University of Technology.” Source: Fusion

Sources reviewed by Cointelegraph claim that from the very beginning (May 21), Chinese authorities accused Zhaojun of “money laundering” by bridging tainted assets from users via the Multichain protocol. As a result, the police have attempted to seize all protocol assets, user, enterprise or tainted alike, as proceeds of crime. Although some of these seizures were prevented when centralized exchanges or stablecoin issuers froze the funds, the rest have passed into the hands of Chinese authorities, these sources claim.

Wuwei Liang, a former staff member of crypto exchange CoinXP, claims that in 2019, the firm’s entire development team was apprehended by Chinese police, along with the confiscation of protocol funds and shutdown of all relevant operations. Liang Liang, the firm’s CEO, was subsequently charged with operating a “multi-level marketing operation” and a “pyramid scheme,” which could result in the criminal seizure of the projects’ users’ and enterprise’s assets al if convicted. 

During the trial this July, some sources claim that key witnesses and defense attorneys were threatened with legal intimidation. A presiding judge also reportedly stated, “Presumption of innocence until proven guilty” is “not a correct principle” within Chinese law. The trial has been adjourned. 

CoinXP trial participants allegedly being apprehended by police | Source: Liang Liang

In a similar incident on May 29, Chinese crypto exchange BKEX suspended withdrawals citing the need to cooperate with police on charges of “money laundering.” The exchange has not been active since, and, like Multichain, its team members are nowhere to be found. Social channels, too, have gone cold. Its website is also offline. 

Crypto exchange BKEX’s last message to users before halting withdrawals. 

In yet another incident, the entire development team of offshore Hong Kong dollar and Chinese yuan stablecoin issuer Trust Reserve disappeared in May after its office was raided by police. Local sources say that Trust Reserve developers had been detained. Again, the charges are unknown. 

Allegations of corruption

In each of these instances, police have neither informed investors of the charges against protocol developers nor of what process investors can go through to recover their funds. CoinXP’s Liang claims that this is because police are using the legal system as a means of corruption to embezzle investors’ capital for their own benefit: 

“Defense lawyers would persuade the parties and their families [of arrested crypto executive] to comply, shut down servers, hand over [private] keys, and cooperate in pleading guilty, claiming that this will result in leniency. Little do they know that this makes it easy for law enforcement to profit from unlawful conduct, ‘legally’ pushing the parties towards prison and, at the same time, ‘legally’ taking away the digital assets that belong to the users, investors and founding team.”

Whatever the reason, the Chinese government has not yet answered investors’ questions of where the funds have gone and why they have not been returned to users.

Users such as ArkRide, PJ Krypto and others in the “Multichain Scam” group have so far been unable to get answers as to where their hard-earned money went. But one thing is certain: The Multichain exploit will go down as one of the worst crypto hacks of 2023. Across the world, Multichain users’ assets have mysteriously disappeared. Although some of the funds may be recovered, many are still experiencing the trauma it caused them.

Cointelegraph Editor Zhiyuan Sun contributed to this story. 

Magazine: Should we ban ransomware payments? It’s an attractive but dangerous idea

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LiFi launches multi-bridge governance solution after Uniswap debate

The new bridge aggregator allows cross-chain DAOs to only accept votes confirmed by more than one bridge.

Multichain bridging protocol LiFi has launched a multi-message aggregator for decentralized autonomous organization (DAO) governance, according to an Aug. 17 announcement from LiFi research lead Arjun Chand. If implemented by decentralized exchanges, lending apps, and other Web3 protocols, the new aggregator should help prevent governance attacks that originate from cross-chain bridges, according to the aggregator’s documentation.

The announcement comes after a vigorous debate over bridge security on the Uniswap forums in late January and early February, concluding that no single bridge has all the security features necessary for secure governance.

Crypto exchange Uniswap is governed by a decentralized autonomous organization called UniswapDAO. In January, this DAO began discussing deploying a second copy of Uniswap to BNB Chain. This opened the question of how Uniswap would be governed on more than one chain since, previously, all votes were taken on the Ethereum network. On Jan. 24, the DAO voted to deploy a second copy of Uniswap to BNB Chain and to use bridging protocol Celer to send messages from BNB to Ethereum.

Although this proposal passed, controversy erupted almost immediately over the choice of Celer bridge as the means of sending messages. Some DAO participants feared that Celer was not secure enough to prevent cross-chain governance attacks. Instead, they recommended Wormhole, LayerZero, or DeBridge be used. Other participants defended Celer as the correct choice.

On Jan. 31, the DAO held a second vote on which bridge should be used for governance. Wormhole won the vote and was chosen as the official bridge for governance.

UniswapDAO proposal for cross-chain governance. Source: Uniswap.

Despite this win for Wormhole, the referendum was contentious. Only 62% of UNI tokens were used to cast “yes” votes. By contrast, many UniswapDAO proposals received nearly unanimous votes for or against.

In the debate leading up to the vote, many participants concluded that Uniswap should use multiple bridges instead of just one. This way, if one bridge became hacked, the other bridges would reject the malicious messages sent by it, and the attack would be prevented. However, no multi-bridge solution was available at the time. Hence, the proposal's supporters argued that Wormhole should be used until a multi-bridge solution could be created.

Related: Token hoarders defeat the purpose of most DAOs: Study

In the Aug. 18 announcement from LiFi, Chand said the team’s new bridge aggregator would provide “a future-proof solution for different cross-chain messaging needs,” preventing protocols in the future from needing to rely on a single bridge for governance messages.

According to the aggregator’s documents, protocols can use LiFi to require that votes be confirmed on two out of three bridges to be valid. For example, if one bridge says that a DAO token holder voted “yes,” but the two other bridges say that they voted “no,” the “yes” vote will be confirmed. The aggregator can also be configured to use three out of five bridges or any other ratio the DAO wants.

LiFi bridge aggregator design diagram. Source: LiFi.

LiFI isn’t the only team to create a multi-bridge aggregator for DAO governance. Gnosis released a similar protocol called “Hashi” in March.

In June, a UniswapDAO committee claimed that Hashi was “not yet production-ready,” had pending audits and did not have a bug bounty. Therefore, the committee concluded that it was unsuitable to handle DAO governance.

The LiFi aggregator has also not been audited. Chand claimed in his announcement that “soon, we'll expand its testing and submit it for an audit by Trail of Bits.”

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Base launches mainnet bridge UI for end users, sets Aug. 9 for official launch

Coinbase’s Base network began onboarding end users through a bridge UI, and the team announced Aug. 9 as the platform's official launch date.

Coinbase’s Base network has released a user interface (UI) for its official bridge, allowing end users to onboard for the first time without relying on developer tools, according to an Aug. 3 announcement. The team has set Aug. 9 as Base’s “official” release date. The team will award over 100 Ether (ETH), worth approximately $184,000, in grants to developers and content creators as part of a month-long launch event called the “Onchain Summer.”

The Base mainnet launched for builders on July 13, but it lacked a functioning UI for its bridge from Ethereum. At the time, the only way to use the network was to employ command-line developer tools to bridge ETH from Ethereum’s layer 1.

In the Aug. 3 announcement, the team said the bridge UI is now running. End users can start using the network immediately without waiting for the official launch; however, some of Base’s initial Web3 apps may not be available until the official launch on Aug. 9.

The user interface for Base network’s Ethereum bridge. Source: Base

The team also announced a month-long “Onchain Summer” celebration. Each day, builders will “be bringing you something fun to do onchain, highlighting art, music, gaming, advocacy, and more,” the announcement stated. The team will award ETH grants to individuals or groups that create Base-related websites, art and videos or who deploy new protocols to the network between Aug. 9 and Sept. 13. The team will hand out Base-related nonfungible tokens and ETH to users who bridge to the network or complete educational “quests.”

Related: Base’s largest DEX, LeetSwap, halts trading amid exploit concerns

Some investors lost millions of dollars worth of crypto on Base while trying to use it when it was “launched for builders” and not publicly available. The Pond0x (PNDX) memecoin was launched for Base on July 28, and tech-savvy investors who knew how to bridge without a UI poured over $2 million into the project, only to have the token collapse to near zero in price as a bug in its transfer function was found. Another Base memecoin, Bald (BALD), resulted in losses of approximately $1.9 million when the developer pulled liquidity from the exchange it was trading on.

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Multichain MPC bridge sees $100M+ outflows, sparking fears of exploit

Some Multichain contracts on Ethereum suffered withdrawals of more than half of their deposits, causing on-chain sleuths to fear an exploit is underway.

Abnormally large outflows from the Multichain MPC bridge platform on July 6 have sparked fears that an exploit could be underway. Over $102 million worth of crypto has been withdrawn from Multichain’s Fantom bridge on the Ethereum side, as well as $666,000 from Dogechain and $5 million from Moonriver.

On July 6, 7,214 Wrapped Ether (WETH) tokens (worth $13.6 million), 1,024 Wrapped Bitcoin (WBTC) (worth $31 million) and $58 million worth of US Dollar Coin (USDC) were withdrawn from the Fantom bridge’s Ethereum smart contract, with a total of approximately $102 million in cryptocurrency withdrawn.

July 6 withdrawals from the Multichain Fantom Bridge contract on Ethereum. Source: Blockchain data

In addition, the Dogechain bridge’s Ethereum contract saw a withdrawal of $666,000, which represented more than 86% of its total deposits, leaving only around $100,000 worth of assets remaining in the bridge. $5,872,661 worth of USDC and Tether (USDT) were withdrawn from the Multichain Moonriver bridge contracts on Ethereum, leaving only around $700,000 remaining on it.

Several on-chain sleuths took to Twitter to label the event as a possible exploit. Blockchain security firm Peckshield tagged the Multichain team in a post showing the Fantom bridge transactions, saying “You may want to take a look.”

This led one commenter to remark that it looks like “another massive hack.” On-chain investigator Spreek posted the Dogechain transactions with the comment “dogechain multichain drained.”

Cointelegraph could not confirm by the time of publication whether the contracts were “drained” or whether a large amount of funds were simply withdrawn by users. 

Cointelegraph reached out to the Multichain team on their Discord channel, but did not get a response by the time of publication. Multichain's last post on Twitter was June 29.

Related: Poly Network urges users to withdraw after exploit affects 57 crypto assets

Multichain is a multi-party computation (MPC) bridging network. When a user wants to bridge assets from one chain to another, the Multichain network first confirms that the assets have been locked on the first chain and then mints derivative assets on the second chain.

When a withdrawal is made, the network goes through this process in reverse: it first confirms that the derivative coins have been destroyed on the second chain, then releases the assets backing them on the first chain.

The Multichain team claims that the cryptographic keys controlling this process are split into multiple shards and distributed throughout the network. This should theoretically prevent any single person or group from being able to make unauthorized withdrawals.

Multichain has been suffering from unspecified technical problems over the past few weeks. On May 31, the team announced that their CEO had gone missing and they were experiencing “multiple issues due to unforeseeable circumstances,” leading to delayed transactions. On July 5, Binance halted withdrawals of some Multichain derivative tokens due to the network failing to process transactions in a timely manner.

Asia Express: HK crypto ETFs on fire, Binance warns on Maverick FOMO, Poly hack

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