{
  "manageEntity": {
    "action": "Save",
    "entityId": "739808480",
    "entityType": "Track",
    "nonce": "1792352727069087567",
    "signature": "0xa7e3381b555e7edfa528c85368619cae6b73efe758ea45e70709082d8069be907c68a3a5216200585ac44949fcfbd6993ad3bb9355d488c538a99f771c63b1701c",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}