{
  "manageEntity": {
    "action": "Save",
    "entityId": "915717219",
    "entityType": "Track",
    "nonce": "0x3d6a7fe5e14ce8a634311362bbfb5dc4c36817c50af0874761c805623f440774",
    "signature": "0xab478706ed3ef41013d086b46e19d45f995a299deea16f114039930a8802a9d026ca85f0ed95a334ebeea4f5c4ee76375aa5fa37fb3b13e9a7e24af077b3e4ae1b",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}