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Add release notes entry

Tom Harding 8 years ago
  1. 46


@ -19,3 +19,49 @@ estimate. @@ -19,3 +19,49 @@ estimate.
Statistics used to estimate fees and priorities are saved in the
data directory in the 'fee_estimates.dat' file just before
program shutdown, and are read in at startup.
Double-Spend Relay and Alerts
VERY IMPORTANT: *It has never been safe, and remains unsafe, to rely*
*on unconfirmed transactions.*
When an attempt is seen on the network to spend the same unspent funds
more than once, it is no longer ignored. Instead, it is broadcast, to
serve as an alert. This broadcast is subject to protections against
denial-of-service attacks.
Wallets and other bitcoin services should alert their users to
double-spends that affect them. Merchants and other users may have
enough time to withhold goods or services when payment becomes
uncertain, until confirmation.
Bitcoin Core Wallet Alerts
The Bitcoin Core wallet now makes respend attempts visible in several
If you are online, and a respend affecting one of your wallet
transactions is seen, a notification is immediately issued to the
command registered with `-respendnotify=<cmd>`. Additionally, if
using the GUI:
- An alert box is immediately displayed.
- The affected wallet transaction is highlighted in red until it is
confirmed (and it may never be confirmed).
A `respendsobserved` array is added to `gettransaction`, `listtransactions`,
and `listsinceblock` RPC results.
*If you rely on an unconfirmed transaction, these change do VERY*
*LITTLE to protect you from a malicious double-spend, because:*
- You may learn about the respend too late to avoid doing whatever
you were being paid for
- Using other relay rules, a double-spender can craft his crime to
resist broadcast
- Miners can choose which conflicting spend to confirm, and some
miners may not confirmg the first acceptable spend they see