BTC Withdrawal

1. User sends tokens to the contract where they initially received the P2WSH or P2TR lock.

2. Ensure the sender is the native BTC sender.

3. If using a MetaMask address, specify the receiver; otherwise, the transaction will be rejected.

4. A P2PKH output is created.

5. The BTC is sent back to the user through a TSS signed transaction, completing the withdrawal process.

6. (EVM chains only) Contract verifies the voucher and then destroys it to prevent reuse.