For years, the honest answer to 'my wallet was drained, can you get anything back' was almost always no. That's changed for a specific category of case: assets that are still technically sitting in a compromised wallet because a sweeper bot couldn't reach them yet. Understanding why that gap exists, and how to use it, is the basis of a genuinely useful recovery technique.
Why Anything Is Left Behind at All
When an attacker compromises a wallet, they typically do two things: drain everything they can reach immediately, then install a sweeper bot that monitors the balance and drains anything new the moment it arrives. But some assets don't drain cleanly on the first pass, tokens staked in a liquidity pool or an income-generating position, for instance, may be locked until a specific unlock condition is met. The attacker's bot simply waits, and keeps the legitimate owner locked out in the meantime.
The Core Problem With a Normal Recovery Attempt
The obvious move, send a small amount of ETH into the compromised wallet to cover gas, then withdraw the locked asset, fails immediately in practice. The sweeper bot is watching the exact same wallet, and it will claim that incoming ETH and any resulting transaction faster than a person can act manually. Any ordinary, publicly broadcast transaction gives the attacker's bot everything it needs to win the race.
How a Private Bundle Gets Around This
The workaround is to never let the funding transaction and the recovery transaction hit the public network separately. Instead, both are packaged into a single bundle, a funding transaction, the transaction that moves the target asset out, and a final transaction confirming the whole sequence succeeded, and submitted directly and privately to a block producer, along with a fee for including it as one atomic unit. Because the bundle only appears on-chain once it has already been fully executed, the attacker's sweeper bot never gets a window to react.
- The compromised contract is reverse-engineered from its published source to identify the exact recovery method needed.
- The full transaction sequence is simulated in advance to estimate gas costs precisely.
- The bundle, funding, recovery, and confirmation, is submitted privately rather than to the public mempool.
- A monitoring process tracks the compromised wallet continuously so any newly unlocked balance can be moved the moment it becomes available, denying the original attacker a second chance.
This only works while the target asset is still reachable and unlocked. If a sweeper bot already claimed it, or if the asset requires a private key the owner never had, there's nothing left to recover through this method, it depends entirely on there being something still sitting in the wallet.
What's Realistically Recoverable
ERC-20 tokens and ERC-721 NFTs both follow standardized interfaces, which means a recovery method built for the standard generally works across any token or collection using it, including bulk-transferring a large batch of NFTs out of a compromised wallet in a single transaction. Stablecoins and standard staking or liquidity-provider tokens are similarly straightforward. Custom protocols with non-standard lock mechanisms require individual reverse engineering and take longer, and support currently extends across Ethereum, Polygon, and other EVM-compatible chains such as Avalanche and BNB Chain.
Why This Matters for Victims
The practical implication is that a drained wallet is not automatically a dead end. If any position was staked, locked, or otherwise inaccessible to the attacker's automated tooling at the time of the theft, there may still be a real, time-sensitive recovery window, and it closes the moment the position unlocks and the attacker's bot gets there first.