{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "190321",
    "entityType": "User",
    "nonce": "0x815b62ab4db95bf85ea4223678cb1443e1fb90783fada9e0944f59301322bbca",
    "signature": "0x07025b3bf20b802f3be4ab0c8b83b632322d9d742c227c94a3696eb699fb2cc3175086e805f28b0aa7f6f92c55b0aff71bf11962a834b2173377972f1980cbfd1c",
    "signer": "0xf15FD63403ea1176eaa213fd9354417c325a643b",
    "userId": "813142179"
  }
}