What details should I screenshot before I close a swap confirmation screen

07 September 2026

Screenshot the transaction hash, the amounts swapped, the token addresses, and the network fee line before you close the confirmation screen. These four items are the minimum evidence you need to reconstruct the swap later if the block explorer or your wallet history fails you.

The confirmation screen is the only moment when all the data appears in one place. Once you click away, some of it may still be retrievable - but not all of it, and not without extra work. Screenshot now, sort later.

The transaction hash

This is the single most important piece of data. A transaction hash (txid) is the permanent identifier for your swap on the Arbitrum blockchain. Without it, finding the swap in a block explorer means guessing the time, the wallet, and the token pair. With it, you paste one string into Arbiscan and the entire record appears.

The hash is usually displayed as a long hexadecimal string. Some interfaces truncate it on screen, but the full hash is visible if you click or hover. Make sure your screenshot captures the complete string. A partial hash is useless.

The amounts

You need the exact input amount and the exact output amount. Not the rounded number, not the estimate that appeared before you confirmed. The final settled amounts are what matter for tax records and for verifying that the swap executed at the expected rate.

Slippage can change the output. So can frontrunning or a sudden price move in the pool. The confirmation screen shows what actually happened, not what was promised. That difference is exactly what you need to document.

The token addresses

Token names are not enough. There are multiple versions of USDC, USDT, and WETH on Arbitrum. A screenshot that says "swapped USDC for WETH" is ambiguous. A screenshot that shows the contract addresses - 0xaf88d065e77c8cC2239327C5EDb3A432268e5831 for USDC, for example - removes all doubt.

Some confirmation screens show the token symbol only. If that is the case, note the addresses separately from the block explorer after the swap. But if the screen does show addresses, capture them.

The network fee

Arbitrum transaction fees are paid in ETH. The confirmation screen shows how much ETH the swap cost in gas. This amount is part of your cost basis for tax purposes. It also helps you verify later that you were not overcharged by a frontend or a router.

The fee line sometimes appears as a dollar estimate rather than an ETH amount. If you see both, capture both. The ETH amount is what the chain records. The dollar amount is what your tax software may want.

What to do if the screen is too long

A single screenshot may not fit everything. Take two. Take three. The goal is completeness, not elegance. Crop later, keep now.

Some confirmation screens have a "Details" dropdown that expands to show more data. Open it before you screenshot. The extra lines often include the router contract, the pool fee tier, and the deadline timestamp.

Why this matters for Arbitrum specifically

Arbitrum receipts have a quirk. The block explorer shows the transaction, but the token transfer logs can be buried under internal transactions if the swap went through a multicall or a permit2 contract. Having your own screenshot means you do not have to dig through internal tx tabs later.

Arbitrum also uses a different fee model than Ethereum mainnet. The fee is paid in ETH on L2, but the cost is much lower. That makes it tempting to skip the recordkeeping. Do not skip it. Low fees mean more swaps, and more swaps mean more records to reconstruct.

The next page to read

This page is part of a larger set under "Arbitrum swap receipts and tax records." That hub page explains how to organize these screenshots into a system that survives tax season. Read it after you have saved your confirmation screens.

Back to arbitrum