Does a swap service need to know my hardware wallet is involved at all
No. A swap service does not need to know that a hardware wallet is involved. The service only sees the transactions you broadcast, not the device or method that created them.
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The core reason is separation of duties. A swap service handles the exchange and routing of assets. It receives your deposit, performs the swap, and sends the result to a destination address you provide. It does not sign your transactions. It does not touch your private keys. Whether those keys live on a hardware wallet, a software wallet, or a piece of paper is invisible to the service.
When you initiate a swap from a hardware wallet, you are effectively doing two separate things. First, you use your hardware device to sign a transaction that sends coins to the swap service's deposit address. Second, you tell the service where to send the swapped funds. The service only sees the signed transaction arriving on the blockchain. It has no way to determine whether that transaction was signed by a hardware wallet, a mobile app, or a command-line tool.
This matters because some users worry that connecting a hardware wallet to a swap interface might leak information about their setup. That worry is misplaced. The swap interface does not read your wallet. It only provides you with a deposit address and asks for a destination address. You prepare the outgoing transaction on your own machine, using your own wallet software. The hardware device signs that transaction locally. The swap service never receives any data about your device, your seed, or your derivation paths.
What the service does need is your destination address. That address is public information. You can generate it from your hardware wallet without sending any coins. Many users verify that address on the device screen before sharing it. That is a security practice, not a requirement of the swap service. The service only cares that the address is valid and that you control it.
The swap service also needs to see the deposit transaction arrive on the blockchain. That is public by definition. Anyone can see that a transaction was sent from a particular address to the service's address. But that transaction does not reveal whether the sender used a hardware wallet. It only reveals the source address and the amount.
If you want to move assets held on a hardware device without exposing your keys, the process is straightforward. You keep the keys on the device. You sign the outgoing transaction with the device. You give the swap service only a destination address. The service never learns about the hardware wallet at all.
For the full picture of how to swap from a hardware wallet without exposing your seed, read the hub page "Swapping from a hardware wallet without exposing the seed." That page covers the overall workflow and the assumptions that make this approach safe.
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