{
  "manageEntity": {
    "action": "Save",
    "entityId": "378903438",
    "entityType": "Track",
    "nonce": "0x19ddb777c153bdbeca81b07fefc0aa87587236209e01a053ffd25d73fedfe54f",
    "signature": "0x11e985285f4e8d2bc04581974b37f9dd5a2c140b36fa6d805c52703372f9e7e4390aad9529a202300e26bcf707fe6c2dd32b7c365ba13dd3211077e28c01ac9c1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}