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Diffstat (limited to 'doc/release-notes-13756.md')
| -rw-r--r-- | doc/release-notes-13756.md | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/doc/release-notes-13756.md b/doc/release-notes-13756.md new file mode 100644 index 0000000000..a500aceb0f --- /dev/null +++ b/doc/release-notes-13756.md @@ -0,0 +1,41 @@ +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. + +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 `setwalletflag` RPC 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 +- getbalances +- sendtoaddress + +In addition, `sendtoaddress` has been changed to avoid partial spends when `avoid_reuse` +is enabled (if not already enabled via the `-avoidpartialspends` command line flag), +as it would otherwise risk using up the "wrong" UTXO for an address reuse case. + +The listunspent RPC has also been updated to now include a "reused" bool, for nodes +with "avoid_reuse" enabled. |