Quote from: RoadTrain on July 08, 2015, 07:24:27 PM

Quote from: turvarya on July 08, 2015, 07:17:17 PM

You can't double spend it, since a node that has the "old" transaction already in their mempool doesn't accept the "new" transaction.
That is to prevent double spends.

F2Pool has recently enabled 'replace-by-fee' feature, which allows you to 'double-spend' unconfirmed txs by adding higher fee.
Though most nodes would refuse to accept to mempool and relay a replacement tx until they have this feature enabled (which may happen in the future).

they have changed to First-seen-safe replace-by-fee [FSS RBF]

https://www.reddit.com/r/Bitcoin/comments/3aejmu/f2pool_we_recognize_the_problem_we_will_switch_to/

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