{
  "manageEntity": {
    "action": "Save",
    "entityId": "999844161",
    "entityType": "Track",
    "nonce": "0x439cc57d84c475dc3dc94f7baf1ab3937cc65780baa4206d7b7a498d782ad923",
    "signature": "0x7d8e457c83427c9d506549e527aa9de03bf427810104c8e9847b7c3c07ead80a77ced8753d6a83ba440adc3ec94e338aa3776933ce259d2084e1a2c992052ff81b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}