{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "16990",
    "entityType": "User",
    "nonce": "0xbc0e18936973090016fde4dc754b62fe58e6c2a3ef48ee5271b90545405ec027",
    "signature": "0xf3018a862b4aaa4eb4ff16ef4a672ed14f1be71cbe1383d4d4cb9214c9fbe1cd281e7b3213c97bb86c81b9d08dc984be8bf7044f9edee54ae0430ad48cea95d01c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}