{
  "manageEntity": {
    "action": "Save",
    "entityId": "401394653",
    "entityType": "Track",
    "nonce": "0x9d88b7a71392839ea0e88a615ed9e69f1ef28e8fb74862a0c393ea538883e625",
    "signature": "0x4a7af676c9dc832ab82143fe1d8306aa7e90650ebbc8d2867328fcd9ee724c437063eaa9fefb9853cff2940070de6b56ed8ea1e2bc8092b61221ad5ba39adcbb1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}