{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "502409808",
    "entityType": "User",
    "nonce": "0xc4ea3e2790fc9f2cc54c7053654494ce04fedcd0ed6ea2ee7b294be9e3944739",
    "signature": "0x16acfbe8950e6a0d66562dce00fac5e273b0f3bbac95d12f53728a7c72c1e4335ab01be996dbb8bdfc843e8a90f607067e5bad334df5a708084a5bc441756c5c1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}