{
  "manageEntity": {
    "action": "Save",
    "entityId": "577886869",
    "entityType": "Track",
    "nonce": "0xa9a3317ce1e4c4bad07c0d0551350ef4fb03dce514fb041a20b8ecf259705aa8",
    "signature": "0x51ac9818fe2032c22caf4421d77b1b15f3a2f612083ccec6647fc16e634fa44e5b63fa99ad26b0c28d3194936751e7697048557da699188da4b572d2262f0d031c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}