# Changelog

## December 2025 - Visitor Identity (Server-Issued Visitor ID)

We introduced a **server-issued, site-scoped `visitorId`** to reliably link events from the same real device across sessions, without depending on client-side storage.

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#### Reliable Device Linking

* Introduced advanced server-side visitor identification to track devices across sessions without persistent client-side storage
* Implemented consistent ID generation logic to ensure reliable user recognition across visits
* Added intelligent matching capabilities to handle minor environment fluctuations and updates

#### Enhanced Matching Accuracy

* Incorporated robust multi-signal device analysis to achieve higher identification precision
* Added network-level intelligence and tie-breaking logic to significantly reduce false positives
* Improved identification stability across changing network conditions and browsing contexts

#### Privacy Mode Resilience

* Improved identification performance in incognito and private browsing modes
* Enhanced stability for privacy-hardened browser configurations and strict privacy settings
* Maintained accuracy even when common anti-fingerprinting measures are active

#### Strict Signal Validation

* Implemented advanced validation logic to prevent false positive matches between similar devices
* Added strict consistency checks for high-confidence signals to ensure identity integrity
* Enforced rigorous verification standards to distinguish between legitimate users and emulation attempts
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## October 2025 - 🚧 Closed Beta - Internal Testing Phase

Guardian Stack is currently in closed beta with select partners. This changelog tracks our progress as we refine fraud detection accuracy and expand platform capabilities.

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#### Enhanced Bot Detection Algorithm

* Improved detection accuracy for sophisticated headless browsers and automation frameworks
* Added support for identifying newer anti-detect browser signatures
* Reduced false positives on legitimate browser extensions and accessibility tools

[Read the documentation](/documentation/readme.md)

#### VPN Detection Improvements

* Enhanced residential proxy detection across major providers
* Better accuracy for legitimate privacy tools vs. fraud-focused VPN usage
* Added confidence scoring for VPN detection results

[Read the documentation](/documentation/readme.md)

#### Server SDK Helper Functions

* Introduced boolean helper functions for quick fraud decisions (isBot(), isVPN(), isTampering())
* Added detailed indicator extraction methods for advanced analysis
* Improved error handling and null-safe operations across all helpers

[Read the documentation](/documentation/readme.md)
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