{
  "manageEntity": {
    "action": "Save",
    "entityId": "555853707",
    "entityType": "Track",
    "nonce": "0xe6c980cd66a3dfddc502ecc2bd02936954cfc3b4b7064893e61269ccbc77d918",
    "signature": "0x630009678b71d15eb491fa0286d6bffeaa831cc39674d64fd2d33b54a3d049344e539e51619bb667945e1038cac55e3930a48b4bf1904acb29305bfa1bbcd6311c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}