{
  "manageEntity": {
    "action": "Save",
    "entityId": "738238",
    "entityType": "Track",
    "nonce": "0x24ebe8eadef2565a3821abd29c3ca7aeefe4f7bef1a77783a90d01bf684bdca6",
    "signature": "0x5b1165aa91691aed09f4a39f3d3813de87dc6819e009fa50eec39390b94b9193271f437265ffd91f1bd01b744d81dd82fee9085018007a3efbd1605fc08e0ae31c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}