{
  "manageEntity": {
    "action": "Save",
    "entityId": "544319",
    "entityType": "Track",
    "nonce": "0xd2d0ffaba281fbeb0e69127cb801094946bf5c6facc27a9c089f7b4845a7ef53",
    "signature": "0xfc3413ba146d9f3ec669b931055115982a41bd9b1dcab0c91614bb426b8c39a05966934a128de4f0d4140f556d39aa2db20ffb4d2742b01f88027fc6894ba6851b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}