{
  "manageEntity": {
    "action": "Save",
    "entityId": "726440083",
    "entityType": "Track",
    "nonce": "1786638290037153531",
    "signature": "0x1fdf374e413ea60e92982c7121ec98c7a5c82a74f8d5f5edb02579c8e56c393a58d121b45ef12699759d0842ef969edcd560a18ef773a9d86dbb35483e7262101b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}