{
  "manageEntity": {
    "action": "Save",
    "entityId": "1440286738",
    "entityType": "Track",
    "nonce": "0x14e243a253fec778294ba998995a13e7ca1d263c6626af02059e378c3781760f",
    "signature": "0xc212004bbcd5a49d6e834c3b88954bb2e9c6d7499eaf66bf94e8775da75fd91a1cf61d6e6def9796df22bbaea182016d47f4b6a3ba4116ef34ed0b06f44f599a1c",
    "signer": "0x8FF85C5AA450a88f13FbD5170e24E2a3eFF32518",
    "userId": "311829956"
  }
}