{
  "manageEntity": {
    "action": "Save",
    "entityId": "655214113",
    "entityType": "Track",
    "nonce": "0x1ffbaa7a6849b480a3e64e84af31bfb3130ee0d5479d2b18b191fed453beb99b",
    "signature": "0x2b375d9a125332484edfba0bb3dd72a3c950584e5ff6c03cb72e0d90548bcd6d7fe951f6fa57535fa6e2581669dcabba01d6c78ca8f3b803ab854590bdb633d21c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}