Carding Through the DeFi Crypto Ecosystem: Flash Loans, Cross-Chain Bridges, and Private Pools

[Good Carder]

From carder to carders. In 2026, traditional crypto mixers will become a thing of the past. Tornado Cash, despite processing $2.5 billion, remains under sanctions, and its addresses are instantly flagged by AML systems. Smart money is moving where regulators haven't yet had time to clean up – into the decentralized DeFi ecosystem. In this article, I'll explore decentralized tools that can be used to conceal the origin of funds: from flash loans, which allow you to move millions without capital, to cross-chain bridges that break the transaction chain. You'll learn how flash loans are used for accelerated cashouts, how THORChain bridges help hide traces, the difference between private pools (Railgun) and traditional mixers, and why cascading through DEXs and cross-chain transfers is becoming the new standard for laundering.

Part 1: Why DeFi Has Become the Perfect Laundromat​

In an era where centralized exchanges are implementing complex KYC/AML procedures and traditional mixers (Tornado Cash, Sinbad.io) are under OFAC sanctions, carders have switched to the decentralized finance (DeFi) ecosystem. According to analysts, criminals are increasingly abandoning centralized exchanges in favor of DeFi, mixers, and cross-chain bridges for laundering funds. A key advantage of DeFi is the absence of a single point of failure and control.

In 2025, cross-chain bridges processed nearly $2.01 billion, or approximately 50% of all stolen assets — more than three times the volume of mixers and private protocols combined.

In April 2026 alone, $606 million in cryptocurrency was stolen — the worst month in DeFi history. Organized crime groups transfer funds through complex multi-step chains, combining flash loans, DEX swaps, and bridges. This money feeds the shadow economy around the world, laundering billions of dollars.

Part 2. Flash Loans: Instant Loans for Quick Funds Transfer​

2.1. What is a flash loan?​

A flash loan is an unsecured instant loan in DeFi that is issued and repaid in a single blockchain transaction. If the loan is not repaid before the transaction is complete, the entire transaction is canceled, eliminating risk for the lender. Anyone can receive millions of dollars in a single transaction without providing collateral. This feature makes flash loans a powerful tool for market manipulation.

2.2. Accelerated Liquidation: How Flash Loans Are Used for Emergency Cashouts​

For a carder who wants to quickly move stolen cryptocurrency into another asset without leaving a trace, flash loans provide the ideal mechanism:

1. Temporary leverage. The carder takes out a huge flash loan (for example, 280 million USDC) through Aave or Morpho. They may not have any equity at all — it's pure leverage.
2. Price manipulation. Using borrowed funds, he artificially alters price data in the Oracle on which the target protocol relies.
3. Liquidity drain. By manipulating the oracle, it withdraws funds from a liquidity pool (for example, on Curve).
4. Instant conversion. In the same block, the stolen USDC is converted into another asset (ETH, XMR) through several DEXs, severing the connection with the original transaction.
5. Loan repayment. The flash loan is repaid from the stolen funds in the same transaction. If the transaction fails, everything is rolled back, but if it succeeds, the carder keeps the "clean" profit.

A real-life example. In January 2026, a carder used a 280 million USDC flash loan obtained through Morpho and Aave to distort the price data underlying the Makina Finance protocol. This resulted in the depletion of the DUSD/USDC pool on Curve. The losses amounted to $5 million, and the funds were withdrawn without any traceability to the final recipient.

2.3. Flash Loan Chain and Liquidity Shortage​

Flash loans can be used to create complex cascading attacks. For example, in the attack on Venus Protocol, a carder combined several flash loans to overcome a liquidity shortage and withdraw funds without leaving a trace. The high-speed transactions typical of flash loans make them more difficult for anti-money laundering (AML) systems to detect.

Part 3. Cross-chain bridges: breaking the chain of transfers​

Once the stolen cryptocurrency is converted into another asset, the connection between the source address and the destination wallet must be severed. This function is performed by cross-chain bridges, which account for almost 50% of all stolen assets.

3.1. THORChain: A Neutral Protocol for Laundering Billions​

THORChain is a decentralized cross-chain liquidity protocol that enables the exchange of assets between different blockchains without intermediaries. A key feature is that THORChain remains a permissionless infrastructure, refusing to block transactions even if there is clear evidence of their criminal origin. This makes it an ideal tool for the final stage of money laundering.

Case study: preparing for the THORChain hack. In May 2026, Chainalysis revealed that, well before the attack on THORChain, hacker-linked wallets had been moving funds between Monero, Hyperliquid, and THORChain itself for several weeks. The scheme looked like this:

• Step 1. Private login. Funds were deposited via Monero (privacy coin) or privacy bridges.
• Step 2. Conversion. Assets were converted to USDC and sent to Arbitrum.
• Step 3. Preparing the node. RUNE was staked in THORChain, creating a new node that was used to conduct the attack.

A key point for carders: THORChain is automatically flagged by AML systems as a high-risk service. However, the protocol itself doesn't block transactions. If you exit THORChain directly to an exchange with KYC, the address's scoring will be disastrous, and your funds will be frozen. But if you first exit to a private pool (Railgun) and then to a P2P exchange, the risks are reduced.

3.2. Swep protocols and cross-chain aggregators​

Lesser-known protocols (Ren, Synapse, Hop) are also actively used for money laundering. According to the US Treasury, over $1.6 billion has flowed through cross-chain bridges from mixing services since May 2020. The report also emphasizes that carders often convert stolen assets into stablecoins to obscure their origin.

A modern technique called "smart splitting" involves splitting stolen funds into more than 50 anonymous wallets, each of which processes small transactions through DEX aggregators (1inch, Uniswap) with a daily volume of approximately $2 billion. In this flow, individual transfers are lost and do not raise the suspicions of AML systems.

Part 4. Private Pools and Anonymous DEXs: The Next Generation of Mixers​

4.1. Railgun: Private Transactions for DeFi​

Railgun is a privacy protocol that uses zk-SNARKs (zero-knowledge proofs) to ensure fully private transactions in the Ethereum ecosystem. Unlike traditional mixers, Railgun doesn't simply mix coins; it enables completely anonymous interactions with smart contracts, hiding the sender, the amount, and the asset type.

As of April 2026, the total value locked in private DeFi protocols reached $4.8 billion. Railgun remains the dominant protocol, while Privacy Pools (launched only in March 2025) have yet to gain significant traction.

4.2. Anonymous DEXs as a New AML Headache​

Privacy-focused DEXs are rapidly gaining momentum. As global cryptocurrency regulation tightens, anonymous DEXs and privacy protocols are becoming a key target for anti-money laundering (AML) monitoring. Governments are responding with bans. The European Union plans to ban credit institutions and crypto service providers from supporting anonymous accounts and privacy coins by 2027. Dubai has already banned privacy tokens (Monero, Zcash) from regulated exchanges.

4.3. Privacy Pools: A New Approach to Mixing​

The Privacy Pools concept, proposed by Vitalik Buterin, differs from classic mixers: instead of checking inputs, it checks outputs. The pool accepts any deposits, but upon withdrawal, users must prove their funds are not linked to known criminal addresses using cryptographic proof. This makes Privacy Pools potentially AML-compliant, although their practical implementation is only just beginning.

4.4. What should a carder choose: a Railgun or a classic mixer?​

Characteristic	Classic Mixer (Tornado Cash)	Private DeFi (Railgun)
Privacy	Temporary pool mixing	Persistent privacy (zk-SNARKs)
AML risk	Addresses are marked, OFAC sanctions	Less marked, but under the radar
Speed	From a few minutes to hours	Instant within one block
Commissions	Usually fixed	Depends on the gas and the complexity of the evidence
Integration with DeFi	Only transfers between addresses	Full interaction with smart contracts

Part 5. The Complete Guide: From Carding to a Private Wallet in 10 Steps​

Now let's put it all together. The ideal laundering scheme in the DeFi ecosystem:

1. Login. Carding or exploiting a smart contract → receiving USDT/ETH on the same blockchain.
2. Splitting. Funds are split into 20+ smaller transactions across different shell addresses.
3. Aggregation. Small amounts are collected into a pool for flash lending (via Aave or Compound).
4. Manipulation. Flash loans are used to manipulate the Oracle price and drain liquidity from the Curve or Uniswap pool.
5. Conversion. Stolen USDC/ETH is converted into another asset (XMR via THORChain or a mixer coin).
6. Cross-chain transfer. The asset is transferred across a bridge (Arbitrum, Optimism, Polygon).
7. Private layer. The clean asset is placed in a private pool (Railgun) for complete privacy.
8. Repayment. The flash loan is repaid from the stolen funds in the same transaction.
9. Exit. The "clean" asset is transferred to a P2P platform or anonymous DEX for exchange for cash.
10. Covering your tracks. The first nine steps occur within a single block or a few minutes, making real-time tracking extremely difficult.

Part 6. Security for DeFi Protocols (and What It Means for Carders)​

For DeFi developers and traders, this is a survival guide. For us, it's an understanding of where the system is failing.

• Oracles and price verification. Most attacks begin with oracle manipulation. Protocols using decentralized solutions (Chainlink) are more resilient than those relying on deposits in liquidity pools.
• Flash loan limits. Some protocols limit the maximum flash loan size to mitigate the damage from a potential attack.
• Real-time monitoring. All transactions on the blockchain are public. If you see the same amount bounce across five protocols in 10 seconds, it's a clear sign of an attack.
• OFAC counter-sanctions. Many US-facing DeFi interfaces block access to sanctioned Tornado Cash addresses. However, the decentralized nature of the protocols makes a complete block virtually impossible.

Part 7. Carder's Checklist: How to Leave No Trace​

• Don't withdraw directly to an exchange with KYC. Always use an intermediate layer after a cross-chain bridge or private pool.
• Use a combination of "cross-chain bridge → private pool → P2P".
• Before the operation, check the risk score of the target addresses. Services like AMLBot can show whether the address is marked as "dirty."
• Fractions of amounts. Never move all funds in one block.
• Keep an eye on fees. High gas fees don't disguise an attack; they draw attention to it.
• Test the scheme on small amounts. An error in the bridge smart contract could result in the loss of all funds without the possibility of a refund.

Summary​

The DeFi ecosystem has provided a powerful new tool for money laundering, but it has also created new risks. Flash loans provide instant leverage for asset manipulation, cross-chain bridges sever on-chain connections, and private pools guarantee complete source concealment. The combination of "flash loan → bridge → private pool" has become the new standard for organizing illicit financial flows, allowing carders to transfer billions of dollars with minimal risk of deanonymization.

In 2025, cross-chain bridges accounted for 50% of all stolen assets. THORChain remains a neutral zone, and Railgun allows for private DeFi transactions without address labeling. However, the battle continues. Governments are tightening regulations, banning privacy coins and anonymous wallets. We retain a tactical advantage: speed.

A quick one-line reminder:
"A flash loan provides leverage without capital, a cross-chain bridge breaks the on-chain connection, a private pool hides the source. THORChain is the last bastion of unlimited laundering. Railgun is your private DeFi terminal. Split amounts, use all three layers, and never go directly to an exchange with KYC. The bridge → private → P2P combination is the only reliable way to stay under the radar in 2026."