{
  "manageEntity": {
    "action": "Save",
    "entityId": "489180860",
    "entityType": "Track",
    "nonce": "0x9200d532bf8aeab90af70758bd844fef59490af4ecac80cff1a8abe33520844c",
    "signature": "0xcf437b3e46938829815bf246f10035e902d8743a0f5b50bd50bc0faaad28fa80665e5fa57e074cf80e4a4f00d0588aca5dd2aaba9c8fddcb7c013f10cdf997c91b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}