A mobile deep link returns you to the app holding an unfinished swap. It routes back to saved app state; it does not revive an expired transaction or approve a new one. If you need to exchange TRX or a TRC-20 token from your wallet, a TRON swap is one way to handle the on-chain exchange, while the return link handles the trip between apps.
A deep link restores app context, not a transaction
What does “resume” mean here? The browser or dapp saves a pending intent, sends you to the wallet to review a request, then uses a callback link to reopen the dapp. The saved intent might contain the selected token contract addresses, input amount, and a short-lived request identifier; it should not contain a seed phrase, private key, or reusable signing authority.
The wallet’s return usually carries a result or correlation value, while the dapp retrieves the actual pending state from its own memory or server. With WalletConnect, the dapp and wallet exchange a request over an established encrypted session; the request ID correlates the wallet’s response with that request. The callback URL is app navigation, not proof that a transaction was signed or broadcast.
On iOS, Universal Links use an HTTPS domain associated with the app; Android App Links use a verified website association. Custom URL schemes can also route to apps, but another app may claim the same scheme. Apple’s Universal Links documentation and Android’s App Links documentation describe these platform routing rules.
The return path depends on saved state and wallet response
How does an unfinished swap survive the handoff? Before opening the wallet, the dapp records a pending operation and generates a unique state value. It launches the wallet with the signing request and a return URI; when the wallet finishes, the operating system routes that URI to the dapp, which matches the returned state to the pending operation and checks the wallet response.
For example, suppose you set a USDT amount, review a TRC-20 swap, then switch to your wallet to approve a token allowance. The dapp can restore the same input after the wallet returns, query the allowance again, and request the next transaction if it is still needed. An allowance is a contract permission, not the swap itself: TRC-20 defines approve and allowance, and the spender later uses transferFrom within the approved amount.
The details that determine whether this works are the pending request ID, the callback URI, the connected account, the selected network, and the contract call being authorized. If the wallet returns without a response, the app should treat the request as pending or cancelled and reconcile its status; it should not assume that simply reopening means approval succeeded.
TRON transaction expiry makes stale requests a real edge case
Why might a restored swap no longer be signable? A TRON transaction includes reference-block data and an expiration timestamp. TRON’s transaction documentation gives a default expiration of about 60 seconds after the head block timestamp, with a maximum of 24 hours; if a user spends too long in the wallet, the transaction can expire before broadcast.
A reliable recovery path rebuilds the transaction against a recent block, then asks the wallet to sign the fresh payload. It must recheck the account, network, token balance, allowance, and quoted minimum output: pool state and price impact can change while the user is away. If the wallet had already broadcast the earlier transaction, the dapp should first look up its transaction ID rather than submit a second swap blindly.
This is why returning to a form and resuming a transaction are different operations. The form state can be restored from a saved intent; a signed transaction is valid only for its original payload and deadline. On TRON, a contract call also consumes Energy, and its fee limit caps the caller’s Energy budget, so a fresh transaction must be rebuilt with a suitable limit rather than reusing stale bytes.
Verify the chain result before starting over
What should you do after the wallet reopens the dapp? Check whether it shows a wallet response or transaction ID, then query that ID and inspect the result before retrying. TRONSCAN can help inspect a transaction’s status and contract interactions; a wallet’s “submitted” state alone does not establish that the swap executed successfully.
If there is no transaction ID and the request expired or was rejected, return to the saved swap intent, refresh its quote and contract state, and approve a newly built request. If there is a transaction ID, wait for its result and verify the token transfers and output amount before deciding whether another swap is needed. A TRON swap still requires explicit wallet authorization for the transaction that actually executes.
Takeaway: a deep link gets you back to the pending swap; fresh chain state and the transaction result tell you whether it can continue.