{
  "manageEntity": {
    "action": "Save",
    "entityId": "858619",
    "entityType": "Track",
    "nonce": "0x85ec15fb4b11a7b786cec29a795246159e8346c7eb1111ef3b61902fe90961a7",
    "signature": "0xe0100073e834042d90d753cb042835f9b0fb774dae4785d35131601cb71eed1b4ea965c3e9d95a41edb35a9ddd4971e3e12596defc77181ac4271a4f69a4a6b21c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}