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litecoin/doc/release-notes-13756.md

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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 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
  • 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.