{
  "manageEntity": {
    "action": "Save",
    "entityId": "262327263",
    "entityType": "Track",
    "nonce": "0xe99337c256721b106f11552e1eea640788d8f023bd9e0ffce10090966d737378",
    "signature": "0xcbed01eda19ecfdd483cf0e51b72b1f3481d9c840678cba7ac8dd30c4f544c6039c755a7c4aab867cc018ab022543138ed33c6ef3f8e2e59e3457b65f7eecffb1b",
    "signer": "0x4089d1751487aA665C895419F2578a6Cf33BE481",
    "userId": "728155533"
  }
}