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Privacy

Understanding CoinJoin

Learn how CoinJoin improves Bitcoin privacy — and when it makes sense for you.

⏱ 4 min read

CoinJoin is a **privacy technique** where multiple people combine their bitcoin payments into a single transaction. An outside observer cannot easily tell which input belongs to which output. On Bitcoin, every transaction is public forever. If someone links your address to your identity (through KYC on an exchange, for example), they can see your entire transaction history.

Understanding CoinJoin
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How It Works (Simple)

How It Works (Simple)
  1. You and several other people each contribute bitcoin inputs
  2. The wallet software combines them into one transaction
  3. Everyone receives the same amount of bitcoin back (minus fees)
  4. An observer sees many equal outputs — they cannot tell which is yours
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Popular CoinJoin Tools

Popular CoinJoin Tools
Tool Wallet Notes
Whirlpool Sparrow, Samourai Fixed denominations (0.001, 0.01, 0.05, 0.5 BTC)
Wasabi Wasabi Wallet WabiSabi protocol, flexible amounts
JoinMarket JoinMarket client Market-based, more advanced
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Before You Try CoinJoin

Before You Try CoinJoin
  • Understand self-custody first (complete Wallets course)
  • Have bitcoin in your own wallet (not on an exchange)
  • Expect to pay coordination fees on top of mining fees
  • CoinJoin is legal in India, but always stay informed on regulations
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Risks and Limitations

Risks and Limitations
  • Some exchanges flag coins with CoinJoin history (account closure risk)
  • Poorly done mixing can be less effective
  • You must use reputable, open-source software only
  • Never use "mixers" from random websites — scams are common
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Step-by-Step (Whirlpool via Sparrow)

Step-by-Step (Whirlpool via Sparrow)
  1. Set up Sparrow Wallet (see our Sparrow tutorial)
  2. Fund your wallet with bitcoin
  3. Go to the Whirlpool tab in Sparrow
  4. Choose a pool size matching your amount
  5. Follow the mixing steps (premix → mix → postmix wallet)
  6. Spend from your postmix wallet for best privacy

✅ Key takeaway

CoinJoin is a powerful privacy tool for Bitcoiners who already practice self-custody. Start by understanding the concept, then try small amounts with Sparrow + Whirlpool or Wasabi when you are ready.

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