{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "6600",
    "entityType": "User",
    "nonce": "0xa30b58f32e9f36408a48aa2abb3d0d41f967154227b14271a30a26383830d964",
    "signature": "0x94dddf3c46928f45b16c673924209317bdf7832841740a5c5babb98708db5b487cb1dfb6b03db6acd39ee412eb5376a7fcdfa3ee623e2abda1f2c237b16fa6061b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}