{
  "manageEntity": {
    "action": "Save",
    "entityId": "666015806",
    "entityType": "Track",
    "nonce": "0x7f8e8062ff76f6a6228c2a6f27ddb1490a26bcb61fe5569c1b96f94be21a2feb",
    "signature": "0x289cd2a8e2fea788f7cf8fca1d5370818a4a3160d8343d9ae238f13fb9c8141a424d2faf56bb5bbfbd2d8f88506b86b7a9389158fb7d3b830c692a721799cc141b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}