{
  "manageEntity": {
    "action": "Save",
    "entityId": "977851",
    "entityType": "Track",
    "nonce": "0xd4b4110c4e217c1ac4580bd288e272e1b7746827aaa4750276f4466e0021cca8",
    "signature": "0x98a8e6513eec199f77978bca52a3e32fb0ae8af221f11bee65dacac5b5095b697f4519ff4d2e9b439a4d034381f121ff3c236d011b848961440604e4f510121b1b",
    "signer": "0xD2F2E85916598FFb221B3d399A164cD39bd24DD7",
    "userId": "132339661"
  }
}