Arbitrum’s Security Council secured approximately $30 million in assets linked to the October 29 Binance exploit, using emergency upgrade powers to move funds out of an attacker-linked address without obtaining its private key. The October 30 intervention moved 8,425 ETH and 74.56 million ARB into a holding address controlled through ArbitrumDAO governance. The assets remain frozen rather than returned to Binance, with a DAO vote required before they can be released. Arbitrum said no other users’ funds or applications were…
ZachXBT Alleges $133M Crypto Theft at Crédit Mutuel ArkéaBlockchain investigator ZachXBT has named Crédit Mutuel Arkéa as the alleged victim of a cryptocurrency theft exceeding $133 million, expanding an investigation into suspicious withdrawals from multiple centralized exchange accounts.
The November 4 disclosure identified the French banking group after earlier alerts referred only to an unnamed European institution. ZachXBT described Arkéa as holding approximately $235 billion in assets and said the suspected attack continued over several days, with potential additional losses involving over-the-counter transactions.
The bank’s involvement has not been independently confirmed. No public response addressing the allegation was identified at publication, and the disclosures do not establish whether the affected assets belonged to the institution, its customers or another party.
Additional Withdrawals Push Estimated Losses Above $133 Million
ZachXBT’s initial alert on November 2 identified more than $106 million in suspected losses from exchange accounts the previous day. The funds were withdrawn as USDC and USDT before being moved through multiple services and blockchains.
He subsequently identified another $27 million-plus in exchange withdrawals, bringing his estimate above $133 million. Some withdrawals occurred after his initial public warning, indicating that the suspected outflows continued after the incident had attracted attention.
The investigator published 11 suspected theft addresses in the original alert and four additional addresses in the follow-up. He did not name the exchanges holding the affected accounts or explain how the attacker obtained access.
The suspected laundering involved swapping USDC for ether, transferring funds through instant exchanges and converting assets into Monero. ZachXBT named WellWallet and Kyrrex among the services receiving transfers and identified Wagyu as a route for conversions into XMR.
Those observations describe the movement of funds; they do not establish that the services knowingly participated in the theft.
“I suspect the amount stolen is larger when accounting for OTC activity,” ZachXBT wrote in the update naming Arkéa. He did not provide a separate estimate for those transactions.
ZachXBT Criticizes Disclosure as Attacker Remains Unidentified
ZachXBT also alleged that inadequate disclosure allowed more than $30 million to be laundered that European law enforcement could otherwise have frozen. He described a possible cover-up as his working theory, rather than an established finding.
Neither deliberate concealment nor the amount that authorities could have intercepted has been independently verified. The $30 million figure concerns funds allegedly moved during the incident, not a separate loss to add to the $133 million estimate.
The attacker remains unidentified. ZachXBT said he was highly confident that Lazarus Group was not responsible, citing multiple laundering indicators. He did not publicly detail those indicators, and his assessment is not a formal law-enforcement attribution.
The disclosures follow Mercado Bitcoin’s suspension of services after a security breach and the FBI’s attribution of the Binance theft to North Korea’s TraderTraitor operation. ZachXBT’s posts provide no evidence connecting the suspected Arkéa incident to either case.
The latest update does not establish how the exchange accounts were compromised, whether unauthorized access has been contained or how much cryptocurrency has been frozen or recovered.
Justin Sun Seeks $264K in WLFI Sanctions Over UAE Ties
Arbitrum Secures $30M in Binance Hack Funds, Vote Pending
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ZachXBT Alleges $133M Crypto Theft at Crédit Mutuel Arkéa
Blockchain investigator ZachXBT has named Crédit Mutuel Arkéa as the alleged victim of a cryptocurrency theft exceeding $133 million, expanding an investigation into suspicious withdrawals from multiple centralized exchange accounts. The November 4 disclosure identified the French banking group after earlier alerts referred only to an unnamed European institution. ZachXBT described Arkéa as holding approximately $235 billion in assets and said the suspected attack continued over several days, with potential additional losses involving over-the-counter transactions. The bank’s involvement has not…
Mercado Bitcoin Says $38M Hit, $11.2M in Assets Frozen
Mercado Bitcoin, one of Brazil's largest cryptocurrency exchanges, has suspended operations following a security breach involving approximately $38 million in digital assets, with $11.2 million already frozen as investigators trace suspicious transfers across multiple blockchains. The incident occurred on November 2, when attackers allegedly gained control of wallets associated with the exchange and transferred substantial cryptocurrency holdings to newly created addresses. Mercado Bitcoin initially suspended deposits and withdrawals before temporarily taking its platform offline. The company maintained that customer assets…
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BTCPay Server has issued an emergency security warning after receiving reports of attackers draining Bitcoin from hot wallets hosted on its payment infrastructure, urging operators to shut down their servers while investigators determine the extent of the compromise. The November 1 alert initially applied to all installations, but subsequent findings narrowed the suspected attack vector to BTCPay Server versions 2.4.1 and earlier. The project has received no credible reports of hot wallet thefts involving its latest 2.4.7 release. The total…
Chainalysis Breach Exposes Customer Data, AI Tools Cited
Blockchain analytics firm Chainalysis has confirmed a cybersecurity breach that exposed customer information after an external attacker used advanced agentic techniques to gain unauthorized access to its internal systems. The incident, disclosed on October 30, compromised user IDs, full names, email addresses and organizational roles associated with customer accounts. However, Chainalysis said its investigation had found no evidence that sensitive investigation records, authentication credentials or active sessions were accessed. The company has notified customers, engaged external cybersecurity specialists and begun…
Binance Wallets See $2.77B Outflows, Hack Unconfirmed
Binance-linked cryptocurrency wallets recorded an estimated $2.77 billion in outgoing transfers across five blockchains on October 29, triggering concerns about a potential security breach as blockchain researchers examined unusually large movements from exchange-associated addresses. The reported outflows drew immediate attention after several high-value Ethereum transactions were traced to a receiving address outside Binance's publicly labeled wallet infrastructure. However, neither a hack nor any loss of customer funds has been confirmed, and the purpose of the transactions remains unclear. The $2.77…
Kraken Parent Payward Plans First CFTC-Regulated Perpetual Markets on Hyperliquid
Kraken parent Payward is moving forward with plans to become the first CFTC-regulated operator of perpetual futures markets on Hyperliquid, combining the decentralized exchange's blockchain infrastructure with federally supervised trading, clearing and brokerage services. The October 26 development introduces a permissioned version of Hyperliquid's HIP-3 framework, allowing regulated operators to restrict market access to approved customers. Payward intends to deploy the contracts through its Bitnomial derivatives businesses, while NinjaTrader Clearing will manage customer accounts. The arrangement remains subject to regulatory…
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