{
  "manageEntity": {
    "action": "Save",
    "entityId": "1540765994",
    "entityType": "Track",
    "nonce": "0x145be7474b119b9dad8ee761d76540666712ebf69d12370b68d9d1461160b23d",
    "signature": "0x651c54acc5283a63cacb75147a44d25e31eea125c59b5db3a7777c75d7ceda4b0a2bb79c431986ebd1dc21b7ce44af0af338c9f62e33c9bb3f5d4846b6b600511c",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}