First POC.

powershell/BankIDClipboardWatcher.ps1

@@ -0,0 +1,39 @@
+function Get-Hash([string]$textToHash) {
+    $hasher = new-object System.Security.Cryptography.MD5CryptoServiceProvider
+    $toHash = [System.Text.Encoding]::UTF8.GetBytes($textToHash)
+    $hashByteArray = $hasher.ComputeHash($toHash)
+
+    foreach($byte in $hashByteArray){
+        $result += "{0:X2}" -f $byte
+    }
+
+    return $result;
+}
+
+$ClearClipboard = $true
+$PreviousHash = Get-Hash(Get-Clipboard)
+
+while ($true) {
+    $Clipboard = Get-Clipboard
+    $ClipboardHash = Get-Hash($Clipboard)
+
+    if ($ClipboardHash -eq $PreviousHash) {
+        Write-Host "NOCHG"
+        Start-Sleep -Milliseconds 250
+        Continue
+    }
+    elseif ($Clipboard -match '^bankid:\/\/\/') {
+        Write-Host $Clipboard
+        start "$Clipboard"
+    }
+    else {
+        Write-Host "CHG"
+    }
+
+    if ($ClearClipboard) {
+        Set-Clipboard -Value $null
+    }
+
+    $PreviousHash = Get-Hash($Clipboard)
+    Start-Sleep -Milliseconds 250
+}