Mercado Bitcoin

Security incidents tagged Mercado Bitcoin. Newest first.

1 Mercado Bitcoin incident in the last 12 months

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Mercado Bitcoin hot wallets drained in a hack worth tens of millions; the exchange is offline and says customers will not lose assets
Brazilian crypto exchange Mercado Bitcoin says it identified a security incident in the early hours of Nov 2 2026 that hit only its online hot wallets, not its offline cold wallets. It notified the authorities, suspended deposits and withdrawals and then took the platform temporarily offline, and says no customer data leaked and customers will not lose assets. In its Nov 2 evening update it said about US$11M had been blocked with help from Tether, Circle, BRL1, Paxos and Chainalysis, and about US$38M was still not blocked. Chainalysis, which helped trace and freeze funds, estimates about $49M was stolen across 17 blockchains, mostly Bitcoin and Ethereum. Crypto Times reports that Mercado Bitcoin later put the affected assets at about $36.3M with $12.9M blocked, and that it is preparing a gradual reopening with no confirmed date. The exchange has not said how the attacker got in.
Mercado Bitcoin (crypto exchange hot wallets)Since Nov 2, 2026updated Nov 4, 2026, 19:10 UTC