{
  "manageEntity": {
    "action": "Save",
    "entityId": "1605946302",
    "entityType": "Track",
    "nonce": "0x3bd416071a56caae34301f43feb0665bd0476db75a61cb206ea13824feb7feea",
    "signature": "0x31e0acf544ae55394617613ed95390be305eb1dea03ee82bd255f0cb094afca6341420cb4ace7f20aefa728cac2fe47adfe99d16dfb98812ba6e8fbfc8c022fa1b",
    "signer": "0x38172042700a71643Dc5B6fC3d7EC8E0992eEF99",
    "userId": "426438502"
  }
}