{
  "manageEntity": {
    "action": "Save",
    "entityId": "1830138620",
    "entityType": "Track",
    "nonce": "0x938db4767ed6574f0bfd45b4725b40829b02f25ae49603cc098a470745cafe8b",
    "signature": "0x7b56a69a12cf2055f946897f55dbd7101382d2da05e2e167b7410b24f974da6c5248b5a3b5ddaaf93b1f7fec0e0694f1bb8ceb8c12c0409b73f5e33f29998c481c",
    "signer": "0xfB6436C438F897b7eA739876B4Cfcca832868820",
    "userId": "512354652"
  }
}