{
  "manageEntity": {
    "action": "Save",
    "entityId": "480443",
    "entityType": "Track",
    "nonce": "0xf9a8a56f8c2596313fb2a5d9530f4388582032580d25d473f44bee2ae113bfd3",
    "signature": "0xffc4863c1e892e1c503f59a7570238320c7b1713989e987732994616cb6a2ccb305aadcf85a474b6922b64257f10ab2ee7995a3fc6876c4fd76cfcdb909ac1e51c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}