Implement Mixing support

[yoshimo]

To get to a point where payments are as private as possible, there should be a way to get rid of taint by mixing coins. There are a few possible options where a mobile interface could be offered:

• JoinMarket as an sell/offer market for CoinJoins https://en.bitcoin.it/wiki/JoinMarket
• Wasabi Wallet V1 https://docs.wasabiwallet.io/using-wasabi/CoinJoin.html
• Wasabi Wallet V2 (WabiSabi) https://github.com/zkSNACKs/WabiSabi
• Samourai Whirlpool

Separating pre-mix and post-mix on different derivation paths is necessary for proper privacy preservation and coin control.

Mixing could be done automatically once certain tresholds of unmixed coin-value is reached and fees are low enough.

[Overtorment]

we already support payjoin, but yes, increase amount of mixes for mobile users would be nice

[xanoni]

Would add this to the list ... Wasabi V1-based, iOS only, currently in testing so not yet rolled out to mainstream app store.

https://chaincase.app/

https://github.com/chaincase-app/Chaincase

[yoshimo]

160k Sats for an implementation

[yoshimo]

@Overtorment could you add the bounty-label?

[yoshimo]

Wasabi Wallet with its new mixing protocol is out.