1.2 KiB
Coin selection
Reuse Avoidance
A new wallet flag avoid_reuse has been added (default off). When enabled,
a wallet will distinguish between used and unused addresses, and default to not
use the former in coin selection.
(Note: rescanning the blockchain is required, to correctly mark previously used destinations.)
Together with "avoid partial spends" (present as of Bitcoin v0.17), this addresses a serious privacy issue where a malicious user can track spends by peppering a previously paid to address with near-dust outputs, which would then be inadvertently included in future payments.
New RPCs
- A new
setwalletflagRPC sets/unsets flags for an existing wallet.
Updated RPCs
Several RPCs have been updated to include an "avoid_reuse" flag, used to control whether already used addresses should be left out or included in the operation. These include:
- createwallet
- getbalance
- sendtoaddress
In addition, sendtoaddress has been changed to enable -avoidpartialspends when
avoid_reuse is enabled.
The listunspent RPC has also been updated to now include a "reused" bool, for nodes with "avoid_reuse" enabled.