{
  "manageEntity": {
    "action": "Save",
    "entityId": "578578052",
    "entityType": "Track",
    "nonce": "1792449448683777528",
    "signature": "0x22640a3107db41863fc15d5c26b4fb187024950dd6167ef6cf9f305f88a06b3217a963d11a1400d370a00148f5a088982e2ce8f74e80cfebcb2c9d6765f78a471c",
    "signer": "0x1007e09532BE90331E035838A9E2E0700bB9741a",
    "userId": "329513359"
  }
}