{
  "manageEntity": {
    "action": "Save",
    "entityId": "386128393",
    "entityType": "Track",
    "nonce": "0x789835f7fd444e29e3b29164b7dbad2a4cdd98a19e9644536b99a3995f5b8903",
    "signature": "0x338bb929296818c93ceec704b0bcce7b9bc1a2cd069ed530d9a49866bc52c604654bf272ae7d3708bfd8bd851fb9a352256c340280049b915a221118d35ddaa71c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}