{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "421",
    "entityType": "User",
    "nonce": "0x385283bfd6eaed95043da89e195e30dbb355294e1dfef7ab6789a4b496423efc",
    "signature": "0x070e581be67a5004b059e4de7c8ce637a97d9452db9077b2c907310c3dbc40426149d6513bb03f8ead0335b5e09539dd44f997216d484fd6e080d93206755be21b",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}