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joinmarket-clientserver/docs/release-notes/release-notes-tumbler-impro...

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copypaste this into "release-notes" when the time comes to make a new release, then delete this file

Notable changes

Tumbler privacy improvements

The tumbler algorithm has been improved with the aim to increase privacy. This affects the tumbler.py script and joinmarket-qt.py GUI.

  • At the start of the run, tumbler will now fully spend all mixdepths with coinjoin with no change address (also known as a sweep transaction) back to its own internal wallet. After these initial sweeps are done tumbler will continue with the already-existing algorithm of sending coinjoins with randomly-generated amounts.

  • Tumbler will now occasionally send a round number of bitcoins, for example 0.20000000 or 0.15000000 instead of 0.24159873. The default probability of this happening is 25% per coinjoin.

  • The default wait time between coinjoins is increased from 30 minutes to 60 minutes.

  • The default number of coinjoin counterparties is increased from 6 to 9.

  • The default number of coinjoins per mixdepth is decreased from 4 to 2.

For a full discription and reasoning behind the changes see: Plan to improve the privacy of JoinMarket's tumbler script