How do I find a swap transaction hash on Arbitrum after I lost the link

07 September 2026

You find a lost swap transaction hash on Arbitrum by looking up your wallet address on a block explorer. The hash is the unique 66-character identifier (starting with "0x") that records every swap on the chain.

Arbitrum transactions are public. Every swap leaves a permanent record, even if you closed the browser tab, cleared your history, or never saved the link. The block explorer is the canonical source. Two major explorers cover Arbitrum: the official Arbitrum block explorer and the general-purpose explorer Etherscan's Arbitrum version. Both work the same way for finding a hash.

Step one: get your wallet address. This is the public key you used to make the swap. If you use a browser extension wallet like MetaMask or a hardware wallet, the address is visible in the wallet interface. Copy it.

Step two: paste the address into the block explorer's search bar. The explorer returns a list of all transactions involving that address. This list includes swaps, transfers, approvals, and any other on-chain activity. The list is sorted by time, most recent first.

Step three: identify the swap transaction. Look for the transaction that matches the approximate time and date of your swap. The explorer shows the "Method" column, which often says "swapExactTokensForTokens" or similar for a swap. You can also filter by "Token Transfers" to see only token movements. The hash is the clickable link in the "Txn Hash" column.

What the hash gets you. Once you have the hash, you can see every detail of the swap: the tokens swapped, the exact amounts, the fees paid in ETH, the block number, and the timestamp. That data is what you need for tax records. The hub page "Arbitrum swap receipts and tax records" explains how to turn that raw data into something your accountant can use.

Why the block explorer works even when the swap interface fails. Swap sites often route transactions through complex smart contracts. The site might show a confirmation screen with a link, but that link is a convenience, not a requirement. The underlying transaction on Arbitrum is independent of the interface that initiated it. The hash exists regardless of whether the site is up, down, or replaced. This is a property of blockchains: the record is not owned by the frontend.

A practical note on timing. Block explorers index transactions quickly, but not instantly. If you lost the link within seconds of swapping, wait a few minutes before searching. The transaction must be confirmed and propagated to the explorer's database. After that, it is permanent.

What if you cannot find the transaction? Three common reasons. First, the swap may have failed and been reverted. Failed transactions still appear on the explorer, but with a "Fail" status. Second, you might be looking at the wrong network. Ensure the explorer is set to Arbitrum, not Ethereum mainnet or another L2. Third, you might have used a different wallet address. Check your wallet's active account.

Why this matters for your records. A hash is the foundational piece of paperwork for any cryptocurrency transaction. Without it, you cannot prove a swap occurred. Tax authorities, auditors, or even your own reconciliation process rely on this string. Saving the hash alongside the timestamp and the amounts is the minimum viable record. The sibling page "What details should I screenshot before I close a swap confirmation screen" covers what else to capture at the moment of the swap.

One final point: do not assume the swap site's internal transaction history is reliable. Sites can change databases, reset logs, or go offline. The block explorer is neutral and persistent. That is where you go when the link is gone.

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