{
  "manageEntity": {
    "action": "Save",
    "entityId": "900460340",
    "entityType": "Track",
    "nonce": "0x3d50613d699bfb91ca52fa27b7e3225048431a5c9cab96c8bb85d7dc83a06d9b",
    "signature": "0x8d539deea7878410130378b801c53283b443670edb3b4e69bb360f3d5d3a98fc7e3184f4f2e7e888bcecccc8a636ae2de4728a26a6779514a9a9d7a213f2e2031c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}