{
  "manageEntity": {
    "action": "Save",
    "entityId": "972068669",
    "entityType": "Track",
    "nonce": "1786589226745589768",
    "signature": "0xc1aa65bc9e4d6874139556a55e820c4e006d44e6610f761d04634720f73c1a2a48a8aeb716a6f42ea5709f86447ed669cea449768048122043433448c0f7d1361b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}