{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "4899",
    "entityType": "User",
    "nonce": "0x7146ba3d68cbe9b33950ab65021a0b60d5ff6678cee6c6c26c0d9e2a4e203adc",
    "signature": "0xa610cb21464740fc92e285aa784d58630b945704ec060a35c4c5775cf4829462318a78fa5073f3ad8b96b236f95240046b13083ec5c389a8b0a45c8be6ce5bf51c",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}