{
  "manageEntity": {
    "action": "Save",
    "entityId": "405318502",
    "entityType": "Track",
    "nonce": "1788128377702555061",
    "signature": "0x5ec4f4df3245bfcb91c24c2add9b8846cd3fb2b8756d0f2c3e2a57988f70253d590285d698e0a9335501a630c19ff877977e9d3efe4edcaf9aa2ab186cf31f6a1b",
    "signer": "0x23dF8876fD80368D375d911e3CbDFd15B8e85CB5",
    "userId": "827420993"
  }
}