{
  "manageEntity": {
    "action": "Save",
    "entityId": "325160302",
    "entityType": "Track",
    "nonce": "0x3b87196230dc5f8cbae71577e7f840c0cc0d28c5c6c990fd71bc3eb1d2223cfe",
    "signature": "0x5c47f416d292d573c46440902021f13f704f780d2963122bcbe083a1085ecaac3f5b7875c7fab644f4365b47f3a624d2cfe2f5068bd148b3603ed6d4fbd5d9501c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}