{
  "manageEntity": {
    "action": "Save",
    "entityId": "767228490",
    "entityType": "Track",
    "nonce": "0x21482babce0f5a98d12b9e45295b875906baf779e888c432d62062bb3532e6c3",
    "signature": "0x8d5b0697044565dd6faee760889ec16c6a1d564d44950fbab05ee8a86aaa846c22802e93946605378fca5a343820ae4afeaebd1c537e447b82d72cd744fc70131b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}