Spending Attacks On Fast Payments In Bitcoin

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Also wondering, is this attack easy to pull off? This guy seemed to be able to double spend without risking the transaction sent to us.

reliably by just sending one absolutely-minimal-fee transaction directly to BitPay and one.

One year ago, was the first time I bought R$ 1.000 (US$ 244) in Bitcoin when 1 BTC = US$ 7.100.

2 Apr 2019.

Yes, this is not a completed double spend, but it's good enough to rob crypto ATMs or anyone else accepting zero or low confirmation payments.

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