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How do I check my withdrawal credentials?

Most solo stakers did not provide a withdrawal address on initial deposit, and so need to update their withdrawal credentials. You can enter your validator index number here to see if you need to update your credentials.This will output a ‘withdrawal credentials’ field which either begins with 0x00 or 0x01 so you can confirm if you need to change your address.
If you don't add withdrawal credentials, ETH will simply get added to your validator account until a withdrawal address is provided.