{
  "manageEntity": {
    "action": "Save",
    "entityId": "1978679484",
    "entityType": "Track",
    "nonce": "1793220974678077790",
    "signature": "0x6e3dba4870a1464253ab0e2298c46903a45fdee26ec70516d36071be7eda30d84ca08339d56ae3fb2ff619d62d2b125e2429606875932ebbb2d8f52fd4bfde0d1b",
    "signer": "0x1007e09532BE90331E035838A9E2E0700bB9741a",
    "userId": "329513359"
  }
}