{
  "manageEntity": {
    "action": "Save",
    "entityId": "574872396",
    "entityType": "Track",
    "nonce": "0xacedf32740c96250145a442c4be88d2501dabf3cd20d8f8efb044d4d42ad9dc2",
    "signature": "0x2718a2a3742d883689a2761fb1c02cb144b4932b19f731e54f45a605c9477ce0437c250bcadaa4b78e1871260dc887342d797d3ada49ed2aaf9cd8d152f17c781c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}