Whirlpool: Samourai Wallet CoinJoin Implementation
Part 2: PreMix, PostMix Stages
Further clarification:
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Some Whirlpool coinjoins typically select 2 fresh inputs from Tx0s and 3 already mixed inputs from previous coinjoins
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The fresh inputs from Tx0 are responsible for paying the fees.
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Inputs that have been previously mixed receive unlimited free remixes.
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Example (check the link): Two fresh inputs are 0.05014520 BTC; the other inputs are exactly 0.05 BTC.
Next posts:
Part3: ReMix Stage
Part4: Anonymity Sets
Part5: XPUB and Blinding Issues
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