{
  "manageEntity": {
    "action": "Save",
    "entityId": "320997315",
    "entityType": "Track",
    "nonce": "0xc897dd790d60b247f3fd3b6b2e42ff18acc4a94fa0cdee9526f12121f9b86227",
    "signature": "0xf0cb79bc5e88e93f718902b6a271e64955abfe262fce2b8fbe41b2c93d19793565dd337f4e58f150b5be19178a5b4cfc997f8dc9c25127eb7c26ba7fe893af801c",
    "signer": "0xF2c19977A72e7f63bBbD9063748E52c002b22f6b",
    "userId": "957488166"
  }
}