What Crypto Mixers and Tumblers Are Used For

A crypto mixer combines deposits from multiple users and allows equivalent funds to be withdrawn to different addresses.

Without a mixer, a blockchain payment often leaves a direct path:

Wallet A sends funds to Wallet B.

A mixer places a shared pool between those addresses:

Wallet A deposits into a pool. Funds are later withdrawn from the pool to Wallet B.

The blockchain still shows that funds entered and left the pool, but the direct link between a particular deposit and withdrawal is harder to establish.

This does not remove transactions from the blockchain. It changes how easily outside observers can connect the sending address to the receiving address. Ethereum describes mixers as tools that place transactions into a shared pool before allowing withdrawals to fresh addresses.

Public blockchains can reveal much more than the details of one payment. Once a wallet becomes connected to someone's identity, other activity from that address may also become visible.

People may use mixers to keep others from reviewing:

• Their total cryptocurrency balance
• Previous payments and transfers
• Other wallets they control
• Business revenue or treasury activity
• Donations and personal purchases
• Payments made to employees, contractors, or suppliers

For example, paying someone directly from a primary wallet may allow the recipient to check the wallet's balance and transaction history. A business accepting crypto may also want to prevent customers or competitors from reviewing its complete flow of funds.

A mixer is intended to provide separation between unrelated parts of a person's or company's financial activity.

Tornado Cash is a well-known Ethereum privacy protocol. It uses smart contracts that accept deposits from one Ethereum address and allow equivalent funds to be withdrawn to another address.

Tornado Cash uses zero-knowledge proofs. These allow a person to prove that they have the right to withdraw funds from a pool without publicly identifying which original deposit belongs to them.

It is also noncustodial. The protocol does not operate like a conventional company account that takes ownership of deposited funds. Access is controlled through cryptographic information generated during the deposit process.

Tornado Cash became the subject of major legal and regulatory debate after the U.S. Treasury sanctioned it in 2022. On March 21, 2025, the Treasury removed the economic sanctions against Tornado Cash and its listed smart-contract addresses.

That removal does not mean every exchange, wallet provider, or jurisdiction treats mixer-related transactions in the same way. Platform policies and local rules may still differ.

A mixer is not a guarantee of complete anonymity.

The level of privacy depends partly on how many deposits are in the pool and whether outside observers can match transaction patterns. Timing, matching amounts, address reuse, network activity, and later wallet activity may weaken the separation a mixer is intended to provide.

Mixers may also involve:

• Blockchain gas or transaction fees
• Multiple wallet addresses
• Extra recordkeeping
• Smart-contract risk
• Delays between deposits and withdrawals
• Exchange reviews or deposit restrictions
• Different legal treatment based on location

Moving cryptocurrency through a long chain of personal wallets is not the same as using a shared privacy pool. Sending funds through 10 or more addresses may create additional blockchain entries without breaking the underlying transaction path. It also requires more fees, more wallet management, and more chances to send funds to the wrong address.

CoinRunner applies a similar separation principle when managing its own cryptocurrency holdings.

A customer's cryptocurrency payment is not forwarded directly to the retailer. CoinRunner receives the payment into its own treasury and purchases the requested product using a company payment method.

CoinRunner may combine, separate, or move balances between company-controlled wallets as part of its internal treasury management. This prevents the retailer purchase from appearing as a direct onchain transfer from the customer's personal wallet.

The retailer sees CoinRunner's company payment rather than the customer's cryptocurrency wallet, bank account, or card information.

This is not the same as promising that a blockchain payment cannot be analyzed. The original payment still exists on the public ledger. The benefit is that the customer does not need to manage a series of wallets or create a direct crypto payment connection with the retailer.

Trying to create privacy manually can become complicated. A person may create several wallets, move funds repeatedly, pay multiple network fees, and keep track of addresses, balances, and recovery phrases.

Those transfers remain public. An observer can often follow the movement from one self-controlled address to the next, especially when the amounts and timing are similar.

CoinRunner removes that work from the shopping process.

You send CoinRunner a product link or custom purchase request through Telegram or email. CoinRunner reviews the request and provides a fixed quote covering the item, shipping, and service fee.

After you approve the quote and pay with a supported cryptocurrency, CoinRunner purchases the product using a traditional company payment method. The retailer ships the item directly to your address. You receive the retailer receipt, tracking information, and order updates through Telegram, email, or your dedicated order page.