The identify event lets you tie a user to their actions and record traits about them. It includes a unique User ID, wallet name, and wallet rdns.

Here’s the payload of a typical call with most common fields removed:

{
    "action": "identify",   
    "payload": {
        "user_id": "0c93652b-a366-4c92-ab87-0c0ab4fba5aa",
        "address": "0x9798d87366bdfc5d70b300abdffc4f9e95369b3d",
        "provider_name": "MetaMask",
        "rdns": "io.metamask"
    }
}