What proof do I need to provide when withdrawing digital assets to a third-party exchange?

You only need to provide corresponding proof when adding the withdrawal whitelist:
1) Proof of information of the third-party exchange account owner. The screenshot must contain the following information:
a. Take a screenshot to show that your KYC name on the third-party exchange are consistent with the name you registered on HashKey;
b. The screenshot must contain the logo of the third-party exchange, and the logo must correspond to the third-party exchange you selected on the front end;
2) The deposit address of the third-party exchange, the screenshot must contain: the deposit wallet address of the currency and the corresponding currency and network of the third-party exchange.