{
  "manageEntity": {
    "action": "Save",
    "entityId": "308878126",
    "entityType": "Track",
    "nonce": "0x868cac82d57ef9c37f14ccff143aa1d57e443f763a8c4d8e1fdcc3fcd8ee8b59",
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    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}