{
  "manageEntity": {
    "action": "Save",
    "entityId": "439563010",
    "entityType": "Track",
    "nonce": "0xdec2c7f330edeabdfeb19d019c9311c55a2080fad3766550afd3438ca83764d8",
    "signature": "0x7358fb620684861392cdc85a1348f1c463b6a1c63f2d10a356337cd824ac5ae9146d7affb23afde86b00a1b290f5eeb0fdbe685a2539d8a1613037fc5311a2541c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}