ESEA is following a new Know Your Customer process in order to raise the standards in esports and ensure compliance with various regulatory and 3rd party standards. ESEA has partnered with an experienced third-party, Sum&Substance, to validate your identity. Sum&Substance is an industry leader in online verification, supporting thousands of document types and have verified over 10,000,000 unique identities. You can read more about Sub&Substance and their work, here.
When you have won a cash prize or wish to withdraw money through the referral system on ESEA you will be able to go to the "Identity Verification tab" here in order to verify your identity. You will also receive an ESEA private message with the link. Non Cash prizes such as CS:GO skins are not affected and you do not need to verify your identity for those.
The process of verifying your identity is quick and easy. Simply fill out your full name and email address, add a picture of your photo identification and finally a picture of yourself holding your photo identification close to your face. A more in-depth step by step guide is available here.
If you need any help please make a support ticket here.