{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "21139",
    "entityType": "User",
    "nonce": "0x0cdc5fe3228ff2db037b3b8f59443b7b868e18f47ab0e6e8c76fe6a6389a8673",
    "signature": "0xd37e40860f225dec1f1323ce3816e05bc0c2e22c1eccabb36369a270e40736a44f53392251909bcbc004d5017e2486c71dfc65c6288c7411eec8cf68876195851b",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}