{
  "manageEntity": {
    "action": "Save",
    "entityId": "1108490",
    "entityType": "Track",
    "nonce": "0x3d1d709035a22339fccda93bb2c739fa9bf1c0c39290212772b1d30c4da0e2b9",
    "signature": "0x42d093d07a2c65592d74ffa8f90be1ffd1c4de040876fe41ab335cbc31935f12512bde7904b86c5366707ba944829997a06c2d9e7849b0962d63b412ef91f4a81b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}