{
  "manageEntity": {
    "action": "Save",
    "entityId": "100603",
    "entityType": "Track",
    "nonce": "0xbcefc84f47acb6d2b28ac22b612078e4a86639284e44573c21bcd5fb6014cbed",
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    "signer": "0x99579cBBf75032De98d51e1f45bC64e75B4B9e1A",
    "userId": "529938035"
  }
}