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🚨 Imagine receiving $100.

You think you received the funds, but they never really arrived, and the worst is yet to come.

Today, we introduce #BigSpender: a vulnerability in some of #Bitcoin ’s most popular wallets, allowing attackers to double (and multiple) spend.
🔓 #BigSpender attacks:

1. Double-spend: Canceled tx still appears in the victim’s wallet

2. Amplification attack: Attackers can repeat the above attack to artificially turn $10 to $1000

3. DoS: When trying to “send all”, the transaction fails
Watch full demonstrations of #BigSpender’s double-spend, amplification, and DoS attacks on the vulnerable wallets 👇

zengo.com/bigspender-dou…
We have disclosed the vulnerability to the affected wallets (@Ledger, @BRDHQ, @EdgeWallet).

Ledger and BRD fixed the issue and ZenGo was awarded a bug bounty.
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