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trustcaptcha

2.0.0-beta.1
nugetNuGet
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TrustCaptcha for DotNet — GDPR-compliant, privacy-first CAPTCHA

Protect websites and apps against bots and spam with a privacy-first, EU-hosted CAPTCHA solution.

What is TrustCaptcha?

TrustCaptcha combines proof-of-work, an AI bot-score and custom security rules to stop automated bot abuse — without image marking or puzzles

Key perks:

  • Privacy-friendly & GDPR-compliant – data processed exclusively in Europe
  • No visual challenges – users never label images or solve quizzes
  • Fully themable widget – matches any brand and design and improves your user flow
  • Conversion-safe – near-zero user drop-off compared to legacy CAPTCHAs

Read the full TrustCaptcha product overview for technical details and the security concept.

Get started

  • Create an account: sign up / sign in.
  • Choose a CAPTCHA: pick an existing one or create a new one.
  • Embed the widget: implement the TrustCaptcha widget into your website or app.
  • Validate result: validate the CAPTCHA verification result in your backend.

Need a walkthrough? See the DotNet integration guide.

Basic DotNet integration

  • Install the dependency
dotnet add package TrustCaptcha --version 2.0.0
  • Retrieve the verification result
// Retrieving the verification result
VerificationResult verificationResult;
try
{
  verificationResult = await CaptchaManager.GetVerificationResult("<your_secret_key>", "<verification_token_from_your_client>");
}
catch (Exception ex)
{
  // Fetch verification result failed - handle error
}
  • Act on the result
// Do something with the verification result
if (!verificationResult.VerificationPassed || verificationResult.Score > 0.5)
{
  Console.WriteLine("Verification failed or bot score > 0.5 – possible automated request.");
}

Congratulations — you have successfully validated the result of the CAPTCHA!

For detailed implementation instructions, read the DotNet integration guide.

Other pre-built integrations

TrustCaptcha ships ready-made integrations for popular stacks:

  • Platforms like WordPress, Joomla, CraftCMS or Keycloak
  • Frontends like JavaScript, Angular, React or Vue.js
  • Backends like Node.js, PHP, Python, Java, Ruby, Rust, Go or DotNet
  • Mobile Applications like iOS, Android, React Native or Flutter

Discover all our pre-built Integrations on our website.

Get support

Questions? We will be happy to help!

Keywords

captcha

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Package last updated on 16 Jun 2025

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