{
  "manageEntity": {
    "action": "Save",
    "entityId": "345160378",
    "entityType": "Track",
    "nonce": "0x752ca23e71f2fae698e23e1d2ef03b8a828f685a95657b49543f26d9c0a5dc50",
    "signature": "0x9f504d2c4f7b05bd0690e7869bc591419682d44f228d390c87a94986aa356da943af3980ac1153f8e1f4489dec05a8b7d5b0aefef49d40f0c0dc1ef7e98c03471c",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}