{
  "manageEntity": {
    "action": "Save",
    "entityId": "663367010",
    "entityType": "Track",
    "nonce": "0x09dd19fd700f8321a6bcdc984baf3a24dcd7b63a20a9d9187510180b9043edcf",
    "signature": "0x9a891f8d09a90594c6646c5fbd7817264dea2a6ca85c72428088fb7d9651ad515fc8fc056ca6aff47e0c872115850fb03a5d26a4eda781dbe16a31f70ee668cc1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}