{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "600556383",
    "entityType": "User",
    "nonce": "0x1f251fce3b146c6976250111157492518230e7e85619b59b223d05bbe7562697",
    "signature": "0x959bc8adde4d62e64b50936732b54232fca876fd2520c1f98e15877d276a9e850c6446864f25326dc0d6cdad3b2529a82d24ef4a4a5f821c1eae1f658a3f11f41b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}