{
  "manageEntity": {
    "action": "Save",
    "entityId": "374209298",
    "entityType": "Track",
    "nonce": "0x1a6c493389d8dc59c1d898701ec078f50833a27fc27242ca52e5eddbfbd13583",
    "signature": "0x55679c83c12cd760e9f35c4bd67777b08b3c65e155e40c588a1ff805edffb98024654d9e954f10a40f514bbc97297289a1d1a6ae1ff3935d7492c2115f713b801c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}