{
  "manageEntity": {
    "action": "Save",
    "entityId": "809644952",
    "entityType": "Track",
    "nonce": "0xab527ff3af73e478b8ede6060a2aeb68c39f437eb556e9c9c83830b2005548f2",
    "signature": "0xeba9f901659273dc9f25bfc41bd59075ad5562e9ddb16b6bcae822d7dd8261607027c60eb6d4dfeaa6e5544e394f98bfe5a3c13b9253c72e9da40c95da186fb61c",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}