{
  "manageEntity": {
    "action": "Save",
    "entityId": "329865",
    "entityType": "Track",
    "nonce": "0xb4e494da68e365ac07ae338fb91ff0cb4898bfb610e14a4e5ef1de4dca1700de",
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    "signer": "0x8E12224e4dDc1BdfeC3d5Bf01DB7e4Ec17403ABa",
    "userId": "627040654"
  }
}