Huobi-withdraw etn ..ID?

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Are you referring to Payment ID?

It is very important to understand Payment ID, huge part of Electroneum. Carefully read entire guide, not once, but twice.

Payment ID in Electroneum Explained

Source: When to Use a Payment ID In Electroneum Transactions When sending Electroneum to someone else or to an exchange, should you use a Payment ID? This article discusses payment IDs, what they’re used for, and how you should use them. What is a Payment ID? In Electroneum, a payment ID is a code unique to each transaction that allows the receiver to discern who sent the funds without actually revealing the identity or wallet address of that user. Think of it as a reference code in a conv…