{
  "manageEntity": {
    "action": "Save",
    "entityId": "1896895077",
    "entityType": "Track",
    "nonce": "0x469112af0ca91c5f75a6c88b5219079147e4a476ee895974ded57b9eeebc95f0",
    "signature": "0x4232dc2170c1abc519a3661f69db0c2ff2616b738db2723e077c3093669601eb6902ae250b9a19c96b260d53dae7f43d3b410c8bad79188df818d8f607abae1c1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}