{
  "manageEntity": {
    "action": "Save",
    "entityId": "599309",
    "entityType": "Track",
    "nonce": "0x3763c656e507e6f41e3adb9c305c335d27cbe5b439372505d280423d1d70c63f",
    "signature": "0x99ae54df7a072a751564b8c7896503632e11ca3dd9bbc0a003fda3aa5b50ea0d2bca83230179eed9ef3faac6c110f6ad7ad8c11f75460252ca1e436ec77bddd51c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}