{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "660696906",
    "entityType": "User",
    "nonce": "0xb1ad3fa8791751ee353ca1ddeaf87be06a9b1a3f5befdb9b144bb0a3acba4be4",
    "signature": "0x75fd86c04225228ba4c5d831ea9a475e5333ed2fc9b826fc447228f29990a77625629fd26e4cd1909a665d2fbad1846ff627b04f871e5a2f6bd2b3946520ad461b",
    "signer": "0xC75a276D0a36850045510B0483E737bCDd1F5E9b",
    "userId": "588125677"
  }
}