Why a Crypto Swap Can Have Two Transaction Hashes

Two transaction hashes usually mean a crypto app sent two separate on-chain actions: one to approve token spending and another to make the swap. Each hash identifies one signed transaction, so you can use them to check what was submitted, whether it succeeded and what changed.

For a token swap, the first moving part may be the token’s smart contract. It records which app or router is allowed to use tokens from your wallet, up to an approved amount. The second action calls the exchange contract to trade those tokens. If you are comparing whether QuickSwap or separate swaps suit your wallet, see how QuickSwap compares with separate swaps. That choice can affect the path you take, but the hashes still identify the transactions that were actually sent.

What does a transaction hash identify?

A transaction hash is a compact identifier for a signed transaction submitted to a blockchain. The wallet signs an instruction, such as calling a token’s approval function or asking a router to swap tokens, then the network uses the hash to track that instruction.

Think of each hash as a tracking number for one parcel. The number helps you find that parcel’s journey; it does not tell you by itself whether it arrived. In the same way, a hash lets an explorer retrieve transaction details, but you need the transaction receipt to see whether execution succeeded.

A hash can appear while a transaction is still pending. Validators must include the transaction in a block before it has an on-chain result. Once included, its receipt records the execution outcome and may show events such as a token approval or transfer. A failed transaction can still have a hash and consume a fee, even though the intended state change did not complete.

Why might a swap show two transaction hashes?

A token that the exchange contract has not yet been allowed to spend can require an approval transaction before the swap. The wallet submits that approval to the token contract and receives one hash. After that transaction is confirmed, the wallet can submit the swap to an exchange router, which receives a second hash.

These are two state changes, so they are checked separately. The approval changes the token contract’s allowance for a spender. The swap asks the exchange contracts to execute a trade, subject to details such as the chosen route and minimum output. If approval succeeds but the swap fails or remains pending, the first hash does not prove the trade happened.

Not every swap produces two hashes. If a sufficient allowance already exists, the app may need only the swap transaction. Some token and app combinations can also use signed authorization that is processed as part of the swap. The wallet’s prompts and transaction records show which steps were used.

How can you use both hashes to check a swap?

Open each hash on an explorer for the same network you used, then read the status and transaction details. Check the approval first: confirm that it called the expected token contract and gave the intended spender permission. Then check the swap: look at its status and token transfer events to see whether the trade completed and what amounts moved.

• Match the network shown in the wallet to the explorer. A hash alone does not tell you which chain to inspect.
• Check the approval’s spender and allowance. A successful approval means permission was recorded, not that a swap took place.
• Check the swap receipt for success and token transfers. A submitted hash is not proof of a completed trade.
• If a transaction is pending, wait for a receipt before treating its result as final.

The practical value of two hashes is separation of evidence. One shows whether permission was granted; the other shows whether the trade executed. Read each receipt for its own result, and use the swap’s transfer events—not the presence of a hash alone—to confirm what reached your wallet.