{
  "manageEntity": {
    "action": "Save",
    "entityId": "810548095",
    "entityType": "Track",
    "nonce": "0x6939036647134497c7b0448712e4d2e5b73394c02300665ba258cecf1d1ec132",
    "signature": "0x0a955a9c2f842d6cd3b4470bf0cee99a3a2c1db73dc7223f65ea0b38160ed9ed5ca56ee9c2e3d76626fd239a5ba30c5ee92321cdd1f7d2ead96b40ad08b05ec91c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}