{
  "manageEntity": {
    "action": "Save",
    "entityId": "669832901",
    "entityType": "Track",
    "nonce": "0x94071f7edac952b82d67c45c578a8924fcc03bb429d1c3e770cbf5fde628bc35",
    "signature": "0x412552b959ba6880434cd24dabd85c6b5ac0f3bf397a15d60032e14062fd84c85d8a3b4085003f4b5d2eb547d36eec248b09d4310c9b285d75ae17829851750e1b",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}