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[TECHNOLOGY] · Brazil · 44 sources

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Part of situation: Security incidents at Brazilian cryptocurrency exchanges (2 clusters)

Mercado Bitcoin suspends operations after security breach

Mercado Bitcoin cryptocurrency hack blockchain security Tether digital asset theft

Mercado Bitcoin, Brazil’s largest cryptocurrency exchange, has temporarily suspended all deposits and withdrawals following a security incident identified on November 2. The exchange reported that it identified and contained the breach in one of its systems and assured customers that no user data was leaked and no customer funds were lost.

Blockchain security researchers and analytics firms have provided varying estimates of the financial impact. Hypernative reported suspicious movements exceeding US$ 40 million across at least ten blockchain networks, including Bitcoin, Ethereum, Solana, and Tron. Other analysts estimated the total value of transfers at approximately US$ 46 million to US$ 49 million. Mercado Bitcoin later stated that approximately US$ 38 million in assets were involved in the incident and that it had successfully blocked US$ 11.2 million in coordination with partners including Tether, Circle, Paxos, and Chainalysis.

The attacker reportedly moved assets through a phased operation, targeting hot wallets and customer deposit addresses. Tether CEO Paolo Ardoino confirmed that the company froze over US$ 4.5 million in USDT tied to the incident. Mercado Bitcoin has stated it plans to cover any resulting losses from its own funds. The exchange is currently working with authorities and security specialists to investigate the breach and determine how the attacker obtained the ability to sign transactions.

Entities

Bitcoin · Brazil · Chainalysis · Circle · Ethereum · Hypernative · Mercado Bitcoin · Paolo Ardoino · Tether

Claims

What the coverage asserts, and how many sources carry each claim.

Sources

Mercado Bitcoin transfers continue after withdrawal pause [cointelegraph.com]
Tether Holds 150,000 Bitcoin, CEO Says—About 50,000 More Than Its Reserve Report Shows [decrypt.co]
Hack do Mercado Bitcoin expõe riscos de segurança; especialistas dizem como se proteger [exame.com]
Crypto Market Volatility and Strategies for Managing Risk and Finding Opportunities in 2026 - WalletInvestor.com [walletinvestor.com]
Mercado Bitcoin hack: Attacker still holds PEPE, AAVE, and PENDLE as millions remain exposed [ambcrypto.com]
Mercado Bitcoin sofre ataque e suspende saques após roubo bilionário [atarde.com.br]
Bitcoin’s Resilience After the Binance Hack Could Be Telling Us Something! [captainaltcoin.com]
How Satoshi Lost $49M: DeFi Risks Every User Should Know [www.coincu.com]
Why Is Crypto Down? Altcoins Sink Up to 25% as US Votes [www.coinspeaker.com]
Élections de mi-mandat : La chute programmée du Bitcoin se confirme ? [www.cointribune.com]
Tether CEO says company now holds about 150,000 Bitcoin [cryptobriefing.com]
Tether freezes $1.5 billion in 30 minutes after Binance hack, but $729 million escapes [cryptoslate.com]
Mercado Bitcoin Confirms $46 Million Crypto Hack as Investigation Continues - FinanceFeeds [financefeeds.com]
Ethereum consolidates as focus shifts to US midterm elections while US-Iran negotiations continue [investinglive.com]
Mercado Bitcoin Freezes Deposits After Suspected $40M Hack [www.livebitcoinnews.com]
Mercado Bitcoin tem perdas de US$ 40 milhões com ataque hacker, estima empresa de segurança [oglobo.globo.com]
Mercado Bitcoin Hack: $46M Drained, Withdrawals Frozen [memeburn.com]
ブラジルのメルカド・ビットコインでセキュリティ侵害、約17.7億円相当の資産凍結 | あたらしい経済 [www.neweconomy.jp]
Binance Inflows Flip Positive After $7 Billion Post-Hack Exodus [news.bitcoin.com]
Hack mot Mercado Bitcoin: Börsen lovar full ersättning [news.trijo.co]
Mercado Bitcoin suspende saques após ‘incidente de segurança’ [olhardigital.com.br]
Mercado Bitcoin drain moved $40M in plain transactions [techreport.com]
Tether Reports $1.5B Q3 Profit as US Secret Service Freezes Funds Linked to Binance Theft [www.tekedia.com]
Tether Freezes 4.5M USDT Linked to Mercado Bitcoin Breach [www.altcoinbuzz.io]
Mercado Bitcoin sofre ataque hacker e diz que clientes não terão perdas - BM&C [bmcnews.com.br]
Brazil’s Mercado Bitcoin reports security incident, freezes withdrawals [crypto.news]
Mercado Bitcoin güvenlik ihlali sonrası transferleri geçici durdurdu [coin-turk.com]
Mercado Bitcoin Wallets Record Transfers After $46M Hack Theft [www.cryptobreaking.com]
Mercado Bitcoin Suspends Withdrawals After Suspicious Transfers [www.dcforecasts.com]
Mercado Bitcoin suspende saques e depósitos após incidente de segurança [www.horabrasil.com.br]
Mercado Bitcoin sofre ataque e suspende saques dias após roubo bilionário na Binance [totalsecurity.com.br]
Piratage Mercado Bitcoin : plus de 40 millions de dollars drainés sur au moins dix blockchains [journalducoin.com]
Crypto News: Bitcoin Price Faces Renewed Pressure While Binance Resumes Crypto Withdrawals After $6.3 Billion Hack [www.sports247.ng]
Mercado Bitcoin confirma ataque hacker nesta segunda-feira [brasilemfolhas.com.br]
Mercado Bitcoin Response Shows Why Frozen Crypto Is Not the Same as Recovered Funds [www.btcnews.com]
Tether congela US$ 4,5 milhões em fundos ligados ao ataque contra o Mercado Bitcoin · CriptoNoticias BR [www.criptonoticias.com.br]
Brazil's Mercado Bitcoin Says It Will Absorb The Loss From A Hack Of Nearly $40 Million - EGamers.io - P2E NFT Games Portal [egamers.io]
Opnieuw cryptobeurs gehackt: mogelijk $40 miljoen gestolen [newsbit.nl]
Brezilya'nın en büyük kripto borsası saldırıya uğradı [www.ogunhaber.com]
Tether Freezes $4.5M USDT As Mercado Bitcoin Probes $40M Breach [www.tronweekly.com]
Mercado Bitcoin bloqueia US$ 11,2 milhões após incidente de segurança | CNN Brasil [www.cnnbrasil.com.br]
CRYPTO CRIME | The Largest Crypto Exchange in Brazil Gets Hacked [bitcoinke.io]
Mercado Bitcoin slibuje pokrýt ztráty po útoku, odchozí převody ale vzbudily další otázky [kryptomagazin.cz]
Mercado Bitcoin Assures Users Won’t Lose Funds Following $38M Security Breach | CryptoCompass [cryptocompass.com]