{
  "manageEntity": {
    "action": "Save",
    "entityId": "816668824",
    "entityType": "Track",
    "nonce": "0xcc1c6b3368d30abaea813a3e29a99b16f66ea00edd4a3359afa0592c6c44909b",
    "signature": "0xee624979a086f107a438c841a72203d8a05c63b41cb82fc559d53d1809a1ef18275742c85410af15724fdf18a4194965ed8a4026522641f0729c0235ded1f3351c",
    "signer": "0x12705C8Fe8CE886CeFEFa0d4d46E906f2c35C954",
    "userId": "477934274"
  }
}