The goal of this thesis is to study the coinjoin protocol for transaction mixing and its implementation called Samourai Whirlpool. In the theoretical part, known methods for the anonymization of messages will be surveyed with a focus on the techniques usable for transaction mixing on the Bitcoin blockchain. An analysis of the properties of the Whirlpool protocol will be performed with a focus on achieved privacy assurances and relevant measurement metrics. In the practical part, a working setup with multiple Whirlpool wallets (either Whirlpool CLI clients or Sparrow wallet integration) and corresponding backend coordinator will be created with a focus on the automatic execution of pre-scripted mixing scenarios and collection of the execution metadata. An evaluation of the impact of possible parameterization of a coinjoin protocol on the resulting privacy assurances shall be evaluated using the setup.
The following parts shall be covered:

• Adaptation of Whirlpool client and coordinator setup for simulation using testnet or (better) regtest network.
• Preparation of parameterizable automatic mixing scenarios.
• Practical simulation-based evaluation of an influence of at least five parameters on relevant privacy metrics.
• Discussion of results and recommendations for practical deployment

Literature:
CoinJoin basics https://en.bitcoin.it/wiki/CoinJoin
D. Varga, CoinJoin protocols and implementations analysis: https://is.muni.cz/auth/th/kbvx1/ Whirlpool mix documentation https://docs.samourai.io/en/whirlpool
Sparrow Wallet coinjoin integration https://sparrowwallet.com/docs/mixing-whirlpool.html