{
  "manageEntity": {
    "action": "Save",
    "entityId": "456008698",
    "entityType": "Track",
    "nonce": "1788336089208119889",
    "signature": "0x15d477cb1ddc68c908b391f3827a03b715b7acc02165bd116628be43f3b9e7ad6474e8d31f53607d65625be7cce789cb30e795442891a0ed1053c4f1daa62a451c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}