{
  "manageEntity": {
    "action": "Save",
    "entityId": "1421480213",
    "entityType": "Track",
    "nonce": "0x1ec22205109a89a8e5f2fc21b786e7f85e6aaa5276f59b99aa73b9bcc67620d8",
    "signature": "0xd607a883ffb1ca6073bd6ecc18e75ab0df51a0328b09a0f0aa81c44c6b45555632c55b4b262b169f1916c8638258d3e10e5912bc8fdba3304ae72273969378571c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}