{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "500600874",
    "entityType": "User",
    "nonce": "0x03f05db022362f5328ee80a82053d959265cff7958134e91837613c35aa702fb",
    "signature": "0xf8c6f088da4142996d7d8406ec6fce32ca78810e71e9627e1b0f92fe8617b2047106ba00c42aa7848351efd2b30b6ecfee236fe86ae486ddb600029afc909d361b",
    "signer": "0xD3e7Bd31A956934D925C23bD6C3C5EBa102e2442",
    "userId": "438585427"
  }
}