Bitcoin over Tor - Privacy Considerations and Best Practices

Every Bitcoin transaction is broadcast across the peer-to-peer network before being confirmed in a block. Without Tor, your ISP and any network observer can see that you are connecting to Bitcoin nodes and can potentially link your IP address to specific transactions. Running Bitcoin Core over Tor prevents this network-level surveillance.

However, Tor only protects your network identity - it does not change the fact that Bitcoin's blockchain is a permanent, public ledger. Every transaction, input, output, and address is visible to anyone. Blockchain analysis firms like Chainalysis routinely trace funds across hundreds of hops. Tor hides your IP, but it cannot hide the transaction graph.

This is why serious privacy users combine Tor with additional tools: CoinJoin implementations like Wasabi Wallet or JoinMarket mix your coins with other users' coins, breaking the deterministic transaction chain. PayJoin (P2P) further obscures transaction boundaries. Use these tools together with Tor for meaningful Bitcoin privacy.

Bitcoin Core natively supports Tor. Add the following lines to your bitcoin.conf file: proxy=127.0.0.1:9050, listen=1, bind=127.0.0.1, and onlynet=onion. The onlynet=onion setting ensures your node only connects to other Tor-accessible nodes, preventing any clearnet IP leaks.

Bitcoin Core will automatically create a Tor hidden service for your node, allowing other Tor users to connect to you. This contributes to the health of Bitcoin's Tor-accessible network and improves decentralization. Your node's .onion address is stored in the Bitcoin data directory.

Be aware that running a Bitcoin node exclusively over Tor increases latency and may slow down initial block download significantly. Consider performing the initial sync over clearnet (which reveals that you run a Bitcoin node but not which addresses are yours) and then switching to Tor-only mode for ongoing operation.

Use Wasabi Wallet for desktop Bitcoin transactions over Tor. Wasabi has built-in Tor integration and automatically routes all traffic through the Tor network. Its CoinJoin implementation mixes your UTXOs with other users, making it significantly harder to trace funds on the blockchain.

On mobile, Samourai Wallet offers similar features with Whirlpool CoinJoin and built-in Tor support. Samourai also includes tools like Stonewall and Ricochet that add decoy inputs and extra hops to transactions, further confounding blockchain analysis.

Never reuse Bitcoin addresses. Every time you receive a payment, generate a fresh address from your HD wallet. Address reuse is the single most common mistake that enables trivial blockchain analysis. Modern wallets handle this automatically, but always verify before sharing a receiving address.

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