{
  "manageEntity": {
    "action": "Save",
    "entityId": "135764243",
    "entityType": "Track",
    "nonce": "1792405393701113527",
    "signature": "0x8a45c952d0355532bcc8e5b86c336c2dde70cbeff442abcc98a67a6112bd6ee34a5f516ba42a994b622ea26d0da2ae788a48a146fe62b8ce708e7c1df9b1dbf31c",
    "signer": "0x512F9723ECbDB6Dc537A671b3D2fb35CC68017a4",
    "userId": "105562689"
  }
}