{
  "manageEntity": {
    "action": "Save",
    "entityId": "1888412755",
    "entityType": "Track",
    "nonce": "0x4e9179f37955b5ebb4cf2b9707fb2630830010183702aa064095e8a79710cccd",
    "signature": "0x8c5344717896492e900eb92d15caa920386663d3941fae4602ace25bdcd87c7e593ab5608f020ce7560d192d0f8372f5032eb554b70db988d3110ce6e94139261c",
    "signer": "0x4086Dda2D91F77cd46De0859a4de37F888508faA",
    "userId": "568518925"
  }
}