{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557688675",
    "entityType": "Track",
    "nonce": "0x7b5f3ab12b01c25d72822c8ae844d3cc8c5176c23d1a15ed1f27a463c345b24e",
    "signature": "0x17d81149a328038ef4bd8a55831329cc38388234fbdb2b6122a71e7130ddcc9650b7c798a64335a31e7152daf84bb5d349f2785c031a34cc744f0e37fbd93e2a1c",
    "signer": "0x8FF85C5AA450a88f13FbD5170e24E2a3eFF32518",
    "userId": "311829956"
  }
}