{
  "manageEntity": {
    "action": "Save",
    "entityId": "1519267222",
    "entityType": "Track",
    "nonce": "0xbd9708e7220739b7fe87cb2bc76c7a151b5b66df6701712e8c980da8760a27df",
    "signature": "0x434842462505457212a3ba340ad7c9ce697ee9dc2dd2f92dac6ea8be2c3e4ed921f0b44dcd92cc0c4ff060052ca8b0cfa866fe294bdb2bde240c98f698ed80491c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}