{
  "manageEntity": {
    "action": "Save",
    "entityId": "587769241",
    "entityType": "Track",
    "nonce": "0xc19d7b02e0b19403346d82e90ea63c9b56839da610916e52779e165fc76c9076",
    "signature": "0x3e198a440d816901fb28204699c7cc8526e25ceb232460058055dc0ec7ad1d5948b724707c69a83f2135a940811d3b3685e1ad1b860fb0b17ec29e935e266e5a1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}