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@ -39,49 +39,3 @@ estimate.
@@ -39,49 +39,3 @@ estimate.
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Statistics used to estimate fees and priorities are saved in the |
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data directory in the 'fee_estimates.dat' file just before |
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program shutdown, and are read in at startup. |
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Double-Spend Relay and Alerts |
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============================= |
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VERY IMPORTANT: *It has never been safe, and remains unsafe, to rely* |
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*on unconfirmed transactions.* |
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Relay |
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----- |
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When an attempt is seen on the network to spend the same unspent funds |
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more than once, it is no longer ignored. Instead, it is broadcast, to |
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serve as an alert. This broadcast is subject to protections against |
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denial-of-service attacks. |
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Wallets and other bitcoin services should alert their users to |
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double-spends that affect them. Merchants and other users may have |
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enough time to withhold goods or services when payment becomes |
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uncertain, until confirmation. |
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Bitcoin Core Wallet Alerts |
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-------------------------- |
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The Bitcoin Core wallet now makes respend attempts visible in several |
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ways. |
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If you are online, and a respend affecting one of your wallet |
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transactions is seen, a notification is immediately issued to the |
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command registered with `-respendnotify=<cmd>`. Additionally, if |
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using the GUI: |
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- An alert box is immediately displayed. |
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- The affected wallet transaction is highlighted in red until it is |
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confirmed (and it may never be confirmed). |
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A `respendsobserved` array is added to `gettransaction`, `listtransactions`, |
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and `listsinceblock` RPC results. |
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Warning |
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------- |
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*If you rely on an unconfirmed transaction, these change do VERY* |
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*LITTLE to protect you from a malicious double-spend, because:* |
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- You may learn about the respend too late to avoid doing whatever |
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you were being paid for |
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- Using other relay rules, a double-spender can craft his crime to |
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resist broadcast |
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- Miners can choose which conflicting spend to confirm, and some |
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miners may not confirmg the first acceptable spend they see |
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