{
  "manageEntity": {
    "action": "Save",
    "entityId": "457575682",
    "entityType": "Track",
    "nonce": "0x595956f3723d17610e6259cf13cd573a51d3c70f6a94323d48ed9b96246f7a18",
    "signature": "0x53515cb56c02f2f27be1cf888659bcb2235efdfd1d2532bc7765dcb0a396edb669515e5392df7d509b2837746fee7ebc06facaa6daa740ab534266fc1c3778871c",
    "signer": "0xEeea4f65FD2D7EffBC68176EAbe8544B088Aed57",
    "userId": "584616263"
  }
}