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Re:Bitcoin Exchanges Under ‘Massive and Concerted Attack’ by maxerickson on Tuesday February 11, 2014 @03:43PM (#7220293)
No. Transactions have to be signed by a private key matching the from address.

The double spend attack works by convincing the other party that the transaction has completed (so they release whatever escrow is in place) and then replacing the blockchain.

(But a botnet infection could watch for wallets on a computer and cause the coins in the wallet to be spent)

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